€•¯è      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ:/translations/zh_CN/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/zh_TW/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/it_IT/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/ja_JP/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/ko_KR/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/pt_BR/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ:/translations/sp_SP/admin-guide/cgroup-v1/blkio-controller”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒBlock IO Controller”h]”hŒBlock IO Controller”…””}”(hh¼h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhh·h²hh³ŒT/var/lib/git/docbuild/linux/Documentation/admin-guide/cgroup-v1/blkio-controller.rst”h´Kubh¶)”}”(hhh]”(h»)”}”(hŒOverview”h]”hŒOverview”…””}”(hhÎh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhhËh²hh³hÊh´KubhŒ	paragraph”“”)”}”(hXt  cgroup subsys "blkio" implements the block io controller. There seems to be
a need of various kinds of IO control policies (like proportional BW, max BW)
both at leaf nodes as well as at intermediate nodes in a storage hierarchy.
Plan is to use the same cgroup based management interface for blkio controller
and based on user options switch IO policies in the background.”h]”hXx  cgroup subsys â€œblkioâ€ implements the block io controller. There seems to be
a need of various kinds of IO control policies (like proportional BW, max BW)
both at leaf nodes as well as at intermediate nodes in a storage hierarchy.
Plan is to use the same cgroup based management interface for blkio controller
and based on user options switch IO policies in the background.”…””}”(hhÞh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KhhËh²hubhÝ)”}”(hŒôOne IO control policy is throttling policy which can be used to
specify upper IO rate limits on devices. This policy is implemented in
generic block layer and can be used on leaf nodes as well as higher
level logical devices like device mapper.”h]”hŒôOne IO control policy is throttling policy which can be used to
specify upper IO rate limits on devices. This policy is implemented in
generic block layer and can be used on leaf nodes as well as higher
level logical devices like device mapper.”…””}”(hhìh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KhhËh²hubeh}”(h]”Œoverview”ah ]”h"]”Œoverview”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒHOWTO”h]”hŒHOWTO”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj  h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒThrottling/Upper Limit policy”h]”hŒThrottling/Upper Limit policy”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj  h²hh³hÊh´KubhÝ)”}”(hŒEnable Block IO controller::”h]”hŒEnable Block IO controller:”…””}”(hj$  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Khj  h²hubhŒliteral_block”“”)”}”(hŒCONFIG_BLK_CGROUP=y”h]”hŒCONFIG_BLK_CGROUP=y”…””}”hj4  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1j2  h³hÊh´Khj  h²hubhÝ)”}”(hŒ"Enable throttling in block layer::”h]”hŒ!Enable throttling in block layer:”…””}”(hjD  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Khj  h²hubj3  )”}”(hŒCONFIG_BLK_DEV_THROTTLING=y”h]”hŒCONFIG_BLK_DEV_THROTTLING=y”…””}”hjR  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Khj  h²hubhÝ)”}”(hŒCMount blkio controller (see cgroups.txt, Why are cgroups needed?)::”h]”hŒBMount blkio controller (see cgroups.txt, Why are cgroups needed?):”…””}”(hj`  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Khj  h²hubj3  )”}”(hŒ2mount -t cgroup -o blkio none /sys/fs/cgroup/blkio”h]”hŒ2mount -t cgroup -o blkio none /sys/fs/cgroup/blkio”…””}”hjn  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K!hj  h²hubhÝ)”}”(hŒ~Specify a bandwidth rate on particular device for root group. The format
for policy is "<major>:<minor>  <bytes_per_second>"::”h]”hŒSpecify a bandwidth rate on particular device for root group. The format
for policy is â€œ<major>:<minor>  <bytes_per_second>â€:”…””}”(hj|  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K#hj  h²hubj3  )”}”(hŒJecho "8:16  1048576" > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device”h]”hŒJecho "8:16  1048576" > /sys/fs/cgroup/blkio/blkio.throttle.read_bps_device”…””}”hjŠ  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K&hj  h²hubhÝ)”}”(hŒoThis will put a limit of 1MB/second on reads happening for root group
on device having major/minor number 8:16.”h]”hŒoThis will put a limit of 1MB/second on reads happening for root group
on device having major/minor number 8:16.”…””}”(hj˜  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K(hj  h²hubhÝ)”}”(hŒDRun dd to read a file and see if rate is throttled to 1MB/s or not::”h]”hŒCRun dd to read a file and see if rate is throttled to 1MB/s or not:”…””}”(hj¦  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K+hj  h²hubj3  )”}”(hŒž# dd iflag=direct if=/mnt/common/zerofile of=/dev/null bs=4K count=1024
1024+0 records in
1024+0 records out
4194304 bytes (4.2 MB) copied, 4.0001 s, 1.0 MB/s”h]”hŒž# dd iflag=direct if=/mnt/common/zerofile of=/dev/null bs=4K count=1024
1024+0 records in
1024+0 records out
4194304 bytes (4.2 MB) copied, 4.0001 s, 1.0 MB/s”…””}”hj´  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K-hj  h²hubhÝ)”}”(hŒHLimits for writes can be put using blkio.throttle.write_bps_device file.”h]”hŒHLimits for writes can be put using blkio.throttle.write_bps_device file.”…””}”(hjÂ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K2hj  h²hubeh}”(h]”Œthrottling-upper-limit-policy”ah ]”h"]”Œthrottling/upper limit policy”ah$]”h&]”uh1hµhj  h²hh³hÊh´Kubeh}”(h]”Œhowto”ah ]”h"]”Œhowto”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒHierarchical Cgroups”h]”hŒHierarchical Cgroups”…””}”(hjã  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjà  h²hh³hÊh´K5ubhÝ)”}”(hŒÐThrottling implements hierarchy support; however,
throttling's hierarchy support is enabled iff "sane_behavior" is
enabled from cgroup side, which currently is a development option and
not publicly available.”h]”hŒÖThrottling implements hierarchy support; however,
throttlingâ€™s hierarchy support is enabled iff â€œsane_behaviorâ€ is
enabled from cgroup side, which currently is a development option and
not publicly available.”…””}”(hjñ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K7hjà  h²hubhÝ)”}”(hŒ1If somebody created a hierarchy like as follows::”h]”hŒ0If somebody created a hierarchy like as follows:”…””}”(hjÿ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K<hjà  h²hubj3  )”}”(hŒ&   root
   /  \
test1 test2
   |
test3”h]”hŒ&   root
   /  \
test1 test2
   |
test3”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K>hjà  h²hubhÝ)”}”(hŒÐThrottling with "sane_behavior" will handle the
hierarchy correctly. For throttling, all limits apply
to the whole subtree while all statistics are local to the IOs
directly generated by tasks in that cgroup.”h]”hŒÔThrottling with â€œsane_behaviorâ€ will handle the
hierarchy correctly. For throttling, all limits apply
to the whole subtree while all statistics are local to the IOs
directly generated by tasks in that cgroup.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KDhjà  h²hubhÝ)”}”(hŒThrottling without "sane_behavior" enabled from cgroup side will
practically treat all groups at same level as if it looks like the
following::”h]”hŒ’Throttling without â€œsane_behaviorâ€ enabled from cgroup side will
practically treat all groups at same level as if it looks like the
following:”…””}”(hj)  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KIhjà  h²hubj3  )”}”(hŒ7        pivot
     /  /   \  \
root  test1 test2  test3”h]”hŒ7        pivot
     /  /   \  \
root  test1 test2  test3”…””}”hj7  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´KMhjà  h²hubeh}”(h]”Œhierarchical-cgroups”ah ]”h"]”Œhierarchical cgroups”ah$]”h&]”uh1hµhh·h²hh³hÊh´K5ubh¶)”}”(hhh]”(h»)”}”(hŒ#Various user visible config options”h]”hŒ#Various user visible config options”…””}”(hjP  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjM  h²hh³hÊh´KRubhŒblock_quote”“”)”}”(hX  CONFIG_BLK_CGROUP
        Block IO controller.

CONFIG_BFQ_CGROUP_DEBUG
        Debug help. Right now some additional stats file show up in cgroup
        if this option is enabled.

CONFIG_BLK_DEV_THROTTLING
        Enable block device throttling support in block layer.
”h]”hŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒ'CONFIG_BLK_CGROUP
Block IO controller.
”h]”(hŒterm”“”)”}”(hŒCONFIG_BLK_CGROUP”h]”hŒCONFIG_BLK_CGROUP”…””}”(hjq  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KUhjk  ubhŒ
definition”“”)”}”(hhh]”hÝ)”}”(hŒBlock IO controller.”h]”hŒBlock IO controller.”…””}”(hj„  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KUhj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjk  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KUhjf  ubjj  )”}”(hŒvCONFIG_BFQ_CGROUP_DEBUG
Debug help. Right now some additional stats file show up in cgroup
if this option is enabled.
”h]”(jp  )”}”(hŒCONFIG_BFQ_CGROUP_DEBUG”h]”hŒCONFIG_BFQ_CGROUP_DEBUG”…””}”(hj¢  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KYhjž  ubj€  )”}”(hhh]”hÝ)”}”(hŒ]Debug help. Right now some additional stats file show up in cgroup
if this option is enabled.”h]”hŒ]Debug help. Right now some additional stats file show up in cgroup
if this option is enabled.”…””}”(hj³  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KXhj°  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjž  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KYhjf  ubjj  )”}”(hŒQCONFIG_BLK_DEV_THROTTLING
Enable block device throttling support in block layer.
”h]”(jp  )”}”(hŒCONFIG_BLK_DEV_THROTTLING”h]”hŒCONFIG_BLK_DEV_THROTTLING”…””}”(hjÑ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K\hjÍ  ubj€  )”}”(hhh]”hÝ)”}”(hŒ6Enable block device throttling support in block layer.”h]”hŒ6Enable block device throttling support in block layer.”…””}”(hjâ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K\hjß  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjÍ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K\hjf  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jd  hj`  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j^  h³hÊh´KThjM  h²hubeh}”(h]”Œ#various-user-visible-config-options”ah ]”h"]”Œ#various user visible config options”ah$]”h&]”uh1hµhh·h²hh³hÊh´KRubh¶)”}”(hhh]”(h»)”}”(hŒDetails of cgroup files”h]”hŒDetails of cgroup files”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj  h²hh³hÊh´K_ubh¶)”}”(hhh]”(h»)”}”(hŒ Proportional weight policy files”h]”hŒ Proportional weight policy files”…””}”(hj$  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj!  h²hh³hÊh´Kbubj_  )”}”(hX±  blkio.bfq.weight
        Specifies per cgroup weight. This is default weight of the group
        on all the devices until and unless overridden by per device rule
        (see `blkio.bfq.weight_device` below).

        Currently allowed range of weights is from 1 to 1000. For more details,
        see Documentation/block/bfq-iosched.rst.

blkio.bfq.weight_device
        Specifies per cgroup per device weights, overriding the default group
        weight. For more details, see Documentation/block/bfq-iosched.rst.

        Following is the format::

          # echo dev_maj:dev_minor weight > blkio.bfq.weight_device

        Configure weight=300 on /dev/sdb (8:16) in this cgroup::

          # echo 8:16 300 > blkio.bfq.weight_device
          # cat blkio.bfq.weight_device
          dev     weight
          8:16    300

        Configure weight=500 on /dev/sda (8:0) in this cgroup::

          # echo 8:0 500 > blkio.bfq.weight_device
          # cat blkio.bfq.weight_device
          dev     weight
          8:0     500
          8:16    300

        Remove specific weight for /dev/sda in this cgroup::

          # echo 8:0 0 > blkio.bfq.weight_device
          # cat blkio.bfq.weight_device
          dev     weight
          8:16    300

blkio.time
        Disk time allocated to cgroup per device in milliseconds. First
        two fields specify the major and minor number of the device and
        third field specifies the disk time allocated to group in
        milliseconds.

blkio.sectors
        Number of sectors transferred to/from disk by the group. First
        two fields specify the major and minor number of the device and
        third field specifies the number of sectors transferred by the
        group to/from the device.

blkio.io_service_bytes
        Number of bytes transferred to/from the disk by the group. These
        are further divided by the type of operation - read or write, sync
        or async. First two fields specify the major and minor number of the
        device, third field specifies the operation type and the fourth field
        specifies the number of bytes.

blkio.io_serviced
        Number of IOs (bio) issued to the disk by the group. These
        are further divided by the type of operation - read or write, sync
        or async. First two fields specify the major and minor number of the
        device, third field specifies the operation type and the fourth field
        specifies the number of IOs.

blkio.io_service_time
        Total amount of time between request dispatch and request completion
        for the IOs done by this cgroup. This is in nanoseconds to make it
        meaningful for flash devices too. For devices with queue depth of 1,
        this time represents the actual service time. When queue_depth > 1,
        that is no longer true as requests may be served out of order. This
        may cause the service time for a given IO to include the service time
        of multiple IOs when served out of order which may result in total
        io_service_time > actual time elapsed. This time is further divided by
        the type of operation - read or write, sync or async. First two fields
        specify the major and minor number of the device, third field
        specifies the operation type and the fourth field specifies the
        io_service_time in ns.

blkio.io_wait_time
        Total amount of time the IOs for this cgroup spent waiting in the
        scheduler queues for service. This can be greater than the total time
        elapsed since it is cumulative io_wait_time for all IOs. It is not a
        measure of total time the cgroup spent waiting but rather a measure of
        the wait_time for its individual IOs. For devices with queue_depth > 1
        this metric does not include the time spent waiting for service once
        the IO is dispatched to the device but till it actually gets serviced
        (there might be a time lag here due to re-ordering of requests by the
        device). This is in nanoseconds to make it meaningful for flash
        devices too. This time is further divided by the type of operation -
        read or write, sync or async. First two fields specify the major and
        minor number of the device, third field specifies the operation type
        and the fourth field specifies the io_wait_time in ns.

blkio.io_merged
        Total number of bios/requests merged into requests belonging to this
        cgroup. This is further divided by the type of operation - read or
        write, sync or async.

blkio.io_queued
        Total number of requests queued up at any given instant for this
        cgroup. This is further divided by the type of operation - read or
        write, sync or async.

blkio.avg_queue_size
        Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
        The average queue size for this cgroup over the entire time of this
        cgroup's existence. Queue size samples are taken each time one of the
        queues of this cgroup gets a timeslice.

blkio.group_wait_time
        Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
        This is the amount of time the cgroup had to wait since it became busy
        (i.e., went from 0 to 1 request queued) to get a timeslice for one of
        its queues. This is different from the io_wait_time which is the
        cumulative total of the amount of time spent by each IO in that cgroup
        waiting in the scheduler queue. This is in nanoseconds. If this is
        read when the cgroup is in a waiting (for timeslice) state, the stat
        will only report the group_wait_time accumulated till the last time it
        got a timeslice and will not include the current delta.

blkio.empty_time
        Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
        This is the amount of time a cgroup spends without any pending
        requests when not being served, i.e., it does not include any time
        spent idling for one of the queues of the cgroup. This is in
        nanoseconds. If this is read when the cgroup is in an empty state,
        the stat will only report the empty_time accumulated till the last
        time it had a pending request and will not include the current delta.

blkio.idle_time
        Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
        This is the amount of time spent by the IO scheduler idling for a
        given cgroup in anticipation of a better request than the existing ones
        from other queues/cgroups. This is in nanoseconds. If this is read
        when the cgroup is in an idling state, the stat will only report the
        idle_time accumulated till the last idle period and will not include
        the current delta.

blkio.dequeue
        Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y. This
        gives the statistics about how many a times a group was dequeued
        from service tree of the device. First two fields specify the major
        and minor number of the device and third field specifies the number
        of times a group was dequeued from a particular device.

blkio.*_recursive
        Recursive version of various stats. These files show the
        same information as their non-recursive counterparts but
        include stats from all the descendant cgroups.
”h]”je  )”}”(hhh]”(jj  )”}”(hX-  blkio.bfq.weight
Specifies per cgroup weight. This is default weight of the group
on all the devices until and unless overridden by per device rule
(see `blkio.bfq.weight_device` below).

Currently allowed range of weights is from 1 to 1000. For more details,
see Documentation/block/bfq-iosched.rst.
”h]”(jp  )”}”(hŒblkio.bfq.weight”h]”hŒblkio.bfq.weight”…””}”(hj=  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Kjhj9  ubj€  )”}”(hhh]”(hÝ)”}”(hŒ©Specifies per cgroup weight. This is default weight of the group
on all the devices until and unless overridden by per device rule
(see `blkio.bfq.weight_device` below).”h]”(hŒˆSpecifies per cgroup weight. This is default weight of the group
on all the devices until and unless overridden by per device rule
(see ”…””}”(hjN  h²hh³Nh´NubhŒtitle_reference”“”)”}”(hŒ`blkio.bfq.weight_device`”h]”hŒblkio.bfq.weight_device”…””}”(hjX  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jV  hjN  ubhŒ below).”…””}”(hjN  h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KehjK  ubhÝ)”}”(hŒpCurrently allowed range of weights is from 1 to 1000. For more details,
see Documentation/block/bfq-iosched.rst.”h]”hŒpCurrently allowed range of weights is from 1 to 1000. For more details,
see Documentation/block/bfq-iosched.rst.”…””}”(hjp  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KihjK  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hj9  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Kjhj6  ubjj  )”}”(hXð  blkio.bfq.weight_device
Specifies per cgroup per device weights, overriding the default group
weight. For more details, see Documentation/block/bfq-iosched.rst.

Following is the format::

  # echo dev_maj:dev_minor weight > blkio.bfq.weight_device

Configure weight=300 on /dev/sdb (8:16) in this cgroup::

  # echo 8:16 300 > blkio.bfq.weight_device
  # cat blkio.bfq.weight_device
  dev     weight
  8:16    300

Configure weight=500 on /dev/sda (8:0) in this cgroup::

  # echo 8:0 500 > blkio.bfq.weight_device
  # cat blkio.bfq.weight_device
  dev     weight
  8:0     500
  8:16    300

Remove specific weight for /dev/sda in this cgroup::

  # echo 8:0 0 > blkio.bfq.weight_device
  # cat blkio.bfq.weight_device
  dev     weight
  8:16    300
”h]”(jp  )”}”(hŒblkio.bfq.weight_device”h]”hŒblkio.bfq.weight_device”…””}”(hjŽ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KˆhjŠ  ubj€  )”}”(hhh]”(hÝ)”}”(hŒˆSpecifies per cgroup per device weights, overriding the default group
weight. For more details, see Documentation/block/bfq-iosched.rst.”h]”hŒˆSpecifies per cgroup per device weights, overriding the default group
weight. For more details, see Documentation/block/bfq-iosched.rst.”…””}”(hjŸ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kmhjœ  ubhÝ)”}”(hŒFollowing is the format::”h]”hŒFollowing is the format:”…””}”(hj­  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kphjœ  ubj3  )”}”(hŒ9# echo dev_maj:dev_minor weight > blkio.bfq.weight_device”h]”hŒ9# echo dev_maj:dev_minor weight > blkio.bfq.weight_device”…””}”hj»  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Krhjœ  ubhÝ)”}”(hŒ8Configure weight=300 on /dev/sdb (8:16) in this cgroup::”h]”hŒ7Configure weight=300 on /dev/sdb (8:16) in this cgroup:”…””}”(hjÉ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kthjœ  ubj3  )”}”(hŒb# echo 8:16 300 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:16    300”h]”hŒb# echo 8:16 300 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:16    300”…””}”hj×  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Kvhjœ  ubhÝ)”}”(hŒ7Configure weight=500 on /dev/sda (8:0) in this cgroup::”h]”hŒ6Configure weight=500 on /dev/sda (8:0) in this cgroup:”…””}”(hjå  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K{hjœ  ubj3  )”}”(hŒm# echo 8:0 500 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:0     500
8:16    300”h]”hŒm# echo 8:0 500 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:0     500
8:16    300”…””}”hjó  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K}hjœ  ubhÝ)”}”(hŒ4Remove specific weight for /dev/sda in this cgroup::”h]”hŒ3Remove specific weight for /dev/sda in this cgroup:”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kƒhjœ  ubj3  )”}”(hŒ_# echo 8:0 0 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:16    300”h]”hŒ_# echo 8:0 0 > blkio.bfq.weight_device
# cat blkio.bfq.weight_device
dev     weight
8:16    300”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´K…hjœ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hjŠ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Kˆhj6  ubjj  )”}”(hŒÓblkio.time
Disk time allocated to cgroup per device in milliseconds. First
two fields specify the major and minor number of the device and
third field specifies the disk time allocated to group in
milliseconds.
”h]”(jp  )”}”(hŒ
blkio.time”h]”hŒ
blkio.time”…””}”(hj-  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KŽhj)  ubj€  )”}”(hhh]”hÝ)”}”(hŒÇDisk time allocated to cgroup per device in milliseconds. First
two fields specify the major and minor number of the device and
third field specifies the disk time allocated to group in
milliseconds.”h]”hŒÇDisk time allocated to cgroup per device in milliseconds. First
two fields specify the major and minor number of the device and
third field specifies the disk time allocated to group in
milliseconds.”…””}”(hj>  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K‹hj;  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj)  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KŽhj6  ubjj  )”}”(hŒæblkio.sectors
Number of sectors transferred to/from disk by the group. First
two fields specify the major and minor number of the device and
third field specifies the number of sectors transferred by the
group to/from the device.
”h]”(jp  )”}”(hŒblkio.sectors”h]”hŒblkio.sectors”…””}”(hj\  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K”hjX  ubj€  )”}”(hhh]”hÝ)”}”(hŒ×Number of sectors transferred to/from disk by the group. First
two fields specify the major and minor number of the device and
third field specifies the number of sectors transferred by the
group to/from the device.”h]”hŒ×Number of sectors transferred to/from disk by the group. First
two fields specify the major and minor number of the device and
third field specifies the number of sectors transferred by the
group to/from the device.”…””}”(hjm  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K‘hjj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjX  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K”hj6  ubjj  )”}”(hXE  blkio.io_service_bytes
Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.
”h]”(jp  )”}”(hŒblkio.io_service_bytes”h]”hŒblkio.io_service_bytes”…””}”(hj‹  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K›hj‡  ubj€  )”}”(hhh]”hÝ)”}”(hX-  Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.”h]”hX-  Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.”…””}”(hjœ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K—hj™  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj‡  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K›hj6  ubjj  )”}”(hX8  blkio.io_serviced
Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.
”h]”(jp  )”}”(hŒblkio.io_serviced”h]”hŒblkio.io_serviced”…””}”(hjº  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K¢hj¶  ubj€  )”}”(hhh]”hÝ)”}”(hX%  Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.”h]”hX%  Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.”…””}”(hjË  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KžhjÈ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj¶  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K¢hj6  ubjj  )”}”(hX  blkio.io_service_time
Total amount of time between request dispatch and request completion
for the IOs done by this cgroup. This is in nanoseconds to make it
meaningful for flash devices too. For devices with queue depth of 1,
this time represents the actual service time. When queue_depth > 1,
that is no longer true as requests may be served out of order. This
may cause the service time for a given IO to include the service time
of multiple IOs when served out of order which may result in total
io_service_time > actual time elapsed. This time is further divided by
the type of operation - read or write, sync or async. First two fields
specify the major and minor number of the device, third field
specifies the operation type and the fourth field specifies the
io_service_time in ns.
”h]”(jp  )”}”(hŒblkio.io_service_time”h]”hŒblkio.io_service_time”…””}”(hjé  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K°hjå  ubj€  )”}”(hhh]”hÝ)”}”(hX   Total amount of time between request dispatch and request completion
for the IOs done by this cgroup. This is in nanoseconds to make it
meaningful for flash devices too. For devices with queue depth of 1,
this time represents the actual service time. When queue_depth > 1,
that is no longer true as requests may be served out of order. This
may cause the service time for a given IO to include the service time
of multiple IOs when served out of order which may result in total
io_service_time > actual time elapsed. This time is further divided by
the type of operation - read or write, sync or async. First two fields
specify the major and minor number of the device, third field
specifies the operation type and the fourth field specifies the
io_service_time in ns.”h]”hX   Total amount of time between request dispatch and request completion
for the IOs done by this cgroup. This is in nanoseconds to make it
meaningful for flash devices too. For devices with queue depth of 1,
this time represents the actual service time. When queue_depth > 1,
that is no longer true as requests may be served out of order. This
may cause the service time for a given IO to include the service time
of multiple IOs when served out of order which may result in total
io_service_time > actual time elapsed. This time is further divided by
the type of operation - read or write, sync or async. First two fields
specify the major and minor number of the device, third field
specifies the operation type and the fourth field specifies the
io_service_time in ns.”…””}”(hjú  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K¥hj÷  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjå  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K°hj6  ubjj  )”}”(hX…  blkio.io_wait_time
Total amount of time the IOs for this cgroup spent waiting in the
scheduler queues for service. This can be greater than the total time
elapsed since it is cumulative io_wait_time for all IOs. It is not a
measure of total time the cgroup spent waiting but rather a measure of
the wait_time for its individual IOs. For devices with queue_depth > 1
this metric does not include the time spent waiting for service once
the IO is dispatched to the device but till it actually gets serviced
(there might be a time lag here due to re-ordering of requests by the
device). This is in nanoseconds to make it meaningful for flash
devices too. This time is further divided by the type of operation -
read or write, sync or async. First two fields specify the major and
minor number of the device, third field specifies the operation type
and the fourth field specifies the io_wait_time in ns.
”h]”(jp  )”}”(hŒblkio.io_wait_time”h]”hŒblkio.io_wait_time”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´K¿hj  ubj€  )”}”(hhh]”hÝ)”}”(hXq  Total amount of time the IOs for this cgroup spent waiting in the
scheduler queues for service. This can be greater than the total time
elapsed since it is cumulative io_wait_time for all IOs. It is not a
measure of total time the cgroup spent waiting but rather a measure of
the wait_time for its individual IOs. For devices with queue_depth > 1
this metric does not include the time spent waiting for service once
the IO is dispatched to the device but till it actually gets serviced
(there might be a time lag here due to re-ordering of requests by the
device). This is in nanoseconds to make it meaningful for flash
devices too. This time is further divided by the type of operation -
read or write, sync or async. First two fields specify the major and
minor number of the device, third field specifies the operation type
and the fourth field specifies the io_wait_time in ns.”h]”hXq  Total amount of time the IOs for this cgroup spent waiting in the
scheduler queues for service. This can be greater than the total time
elapsed since it is cumulative io_wait_time for all IOs. It is not a
measure of total time the cgroup spent waiting but rather a measure of
the wait_time for its individual IOs. For devices with queue_depth > 1
this metric does not include the time spent waiting for service once
the IO is dispatched to the device but till it actually gets serviced
(there might be a time lag here due to re-ordering of requests by the
device). This is in nanoseconds to make it meaningful for flash
devices too. This time is further divided by the type of operation -
read or write, sync or async. First two fields specify the major and
minor number of the device, third field specifies the operation type
and the fourth field specifies the io_wait_time in ns.”…””}”(hj)  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´K³hj&  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´K¿hj6  ubjj  )”}”(hŒ®blkio.io_merged
Total number of bios/requests merged into requests belonging to this
cgroup. This is further divided by the type of operation - read or
write, sync or async.
”h]”(jp  )”}”(hŒblkio.io_merged”h]”hŒblkio.io_merged”…””}”(hjG  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KÄhjC  ubj€  )”}”(hhh]”hÝ)”}”(hŒTotal number of bios/requests merged into requests belonging to this
cgroup. This is further divided by the type of operation - read or
write, sync or async.”h]”hŒTotal number of bios/requests merged into requests belonging to this
cgroup. This is further divided by the type of operation - read or
write, sync or async.”…””}”(hjX  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KÂhjU  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjC  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KÄhj6  ubjj  )”}”(hŒªblkio.io_queued
Total number of requests queued up at any given instant for this
cgroup. This is further divided by the type of operation - read or
write, sync or async.
”h]”(jp  )”}”(hŒblkio.io_queued”h]”hŒblkio.io_queued”…””}”(hjv  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KÉhjr  ubj€  )”}”(hhh]”hÝ)”}”(hŒ™Total number of requests queued up at any given instant for this
cgroup. This is further divided by the type of operation - read or
write, sync or async.”h]”hŒ™Total number of requests queued up at any given instant for this
cgroup. This is further divided by the type of operation - read or
write, sync or async.”…””}”(hj‡  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KÇhj„  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjr  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KÉhj6  ubjj  )”}”(hX   blkio.avg_queue_size
Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
The average queue size for this cgroup over the entire time of this
cgroup's existence. Queue size samples are taken each time one of the
queues of this cgroup gets a timeslice.
”h]”(jp  )”}”(hŒblkio.avg_queue_size”h]”hŒblkio.avg_queue_size”…””}”(hj¥  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KÏhj¡  ubj€  )”}”(hhh]”hÝ)”}”(hŒêDebugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
The average queue size for this cgroup over the entire time of this
cgroup's existence. Queue size samples are taken each time one of the
queues of this cgroup gets a timeslice.”h]”hŒìDebugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
The average queue size for this cgroup over the entire time of this
cgroupâ€™s existence. Queue size samples are taken each time one of the
queues of this cgroup gets a timeslice.”…””}”(hj¶  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KÌhj³  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj¡  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KÏhj6  ubjj  )”}”(hXk  blkio.group_wait_time
Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time the cgroup had to wait since it became busy
(i.e., went from 0 to 1 request queued) to get a timeslice for one of
its queues. This is different from the io_wait_time which is the
cumulative total of the amount of time spent by each IO in that cgroup
waiting in the scheduler queue. This is in nanoseconds. If this is
read when the cgroup is in a waiting (for timeslice) state, the stat
will only report the group_wait_time accumulated till the last time it
got a timeslice and will not include the current delta.
”h]”(jp  )”}”(hŒblkio.group_wait_time”h]”hŒblkio.group_wait_time”…””}”(hjÔ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KÚhjÐ  ubj€  )”}”(hhh]”hÝ)”}”(hXT  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time the cgroup had to wait since it became busy
(i.e., went from 0 to 1 request queued) to get a timeslice for one of
its queues. This is different from the io_wait_time which is the
cumulative total of the amount of time spent by each IO in that cgroup
waiting in the scheduler queue. This is in nanoseconds. If this is
read when the cgroup is in a waiting (for timeslice) state, the stat
will only report the group_wait_time accumulated till the last time it
got a timeslice and will not include the current delta.”h]”hXT  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time the cgroup had to wait since it became busy
(i.e., went from 0 to 1 request queued) to get a timeslice for one of
its queues. This is different from the io_wait_time which is the
cumulative total of the amount of time spent by each IO in that cgroup
waiting in the scheduler queue. This is in nanoseconds. If this is
read when the cgroup is in a waiting (for timeslice) state, the stat
will only report the group_wait_time accumulated till the last time it
got a timeslice and will not include the current delta.”…””}”(hjå  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KÒhjâ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjÐ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´KÚhj6  ubjj  )”}”(hXÕ  blkio.empty_time
Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time a cgroup spends without any pending
requests when not being served, i.e., it does not include any time
spent idling for one of the queues of the cgroup. This is in
nanoseconds. If this is read when the cgroup is in an empty state,
the stat will only report the empty_time accumulated till the last
time it had a pending request and will not include the current delta.
”h]”(jp  )”}”(hŒblkio.empty_time”h]”hŒblkio.empty_time”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Kãhjÿ  ubj€  )”}”(hhh]”hÝ)”}”(hXÃ  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time a cgroup spends without any pending
requests when not being served, i.e., it does not include any time
spent idling for one of the queues of the cgroup. This is in
nanoseconds. If this is read when the cgroup is in an empty state,
the stat will only report the empty_time accumulated till the last
time it had a pending request and will not include the current delta.”h]”hXÃ  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time a cgroup spends without any pending
requests when not being served, i.e., it does not include any time
spent idling for one of the queues of the cgroup. This is in
nanoseconds. If this is read when the cgroup is in an empty state,
the stat will only report the empty_time accumulated till the last
time it had a pending request and will not include the current delta.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´KÝhj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjÿ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Kãhj6  ubjj  )”}”(hX³  blkio.idle_time
Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time spent by the IO scheduler idling for a
given cgroup in anticipation of a better request than the existing ones
from other queues/cgroups. This is in nanoseconds. If this is read
when the cgroup is in an idling state, the stat will only report the
idle_time accumulated till the last idle period and will not include
the current delta.
”h]”(jp  )”}”(hŒblkio.idle_time”h]”hŒblkio.idle_time”…””}”(hj2  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Kìhj.  ubj€  )”}”(hhh]”hÝ)”}”(hX¢  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time spent by the IO scheduler idling for a
given cgroup in anticipation of a better request than the existing ones
from other queues/cgroups. This is in nanoseconds. If this is read
when the cgroup is in an idling state, the stat will only report the
idle_time accumulated till the last idle period and will not include
the current delta.”h]”hX¢  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y.
This is the amount of time spent by the IO scheduler idling for a
given cgroup in anticipation of a better request than the existing ones
from other queues/cgroups. This is in nanoseconds. If this is read
when the cgroup is in an idling state, the stat will only report the
idle_time accumulated till the last idle period and will not include
the current delta.”…””}”(hjC  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kæhj@  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj.  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Kìhj6  ubjj  )”}”(hXM  blkio.dequeue
Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y. This
gives the statistics about how many a times a group was dequeued
from service tree of the device. First two fields specify the major
and minor number of the device and third field specifies the number
of times a group was dequeued from a particular device.
”h]”(jp  )”}”(hŒblkio.dequeue”h]”hŒblkio.dequeue”…””}”(hja  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Kóhj]  ubj€  )”}”(hhh]”hÝ)”}”(hX>  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y. This
gives the statistics about how many a times a group was dequeued
from service tree of the device. First two fields specify the major
and minor number of the device and third field specifies the number
of times a group was dequeued from a particular device.”h]”hX>  Debugging aid only enabled if CONFIG_BFQ_CGROUP_DEBUG=y. This
gives the statistics about how many a times a group was dequeued
from service tree of the device. First two fields specify the major
and minor number of the device and third field specifies the number
of times a group was dequeued from a particular device.”…””}”(hjr  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kïhjo  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj]  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Kóhj6  ubjj  )”}”(hŒ³blkio.*_recursive
Recursive version of various stats. These files show the
same information as their non-recursive counterparts but
include stats from all the descendant cgroups.
”h]”(jp  )”}”(hŒblkio.*_recursive”h]”hŒblkio.*_recursive”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´KøhjŒ  ubj€  )”}”(hhh]”hÝ)”}”(hŒ Recursive version of various stats. These files show the
same information as their non-recursive counterparts but
include stats from all the descendant cgroups.”h]”hŒ Recursive version of various stats. These files show the
same information as their non-recursive counterparts but
include stats from all the descendant cgroups.”…””}”(hj¡  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Köhjž  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjŒ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Køhj6  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jd  hj2  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j^  h³hÊh´Kdhj!  h²hubeh}”(h]”Œ proportional-weight-policy-files”ah ]”h"]”Œ proportional weight policy files”ah$]”h&]”uh1hµhj  h²hh³hÊh´Kbubh¶)”}”(hhh]”(h»)”}”(hŒ#Throttling/Upper limit policy files”h]”hŒ#Throttling/Upper limit policy files”…””}”(hjÒ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjÏ  h²hh³hÊh´Kûubj_  )”}”(hXô  blkio.throttle.read_bps_device
        Specifies upper limit on READ rate from the device. IO rate is
        specified in bytes per second. Rules are per device. Following is
        the format::

          echo "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.read_bps_device

blkio.throttle.write_bps_device
        Specifies upper limit on WRITE rate to the device. IO rate is
        specified in bytes per second. Rules are per device. Following is
        the format::

          echo "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.write_bps_device

blkio.throttle.read_iops_device
        Specifies upper limit on READ rate from the device. IO rate is
        specified in IO per second. Rules are per device. Following is
        the format::

         echo "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.read_iops_device

blkio.throttle.write_iops_device
        Specifies upper limit on WRITE rate to the device. IO rate is
        specified in io per second. Rules are per device. Following is
        the format::

          echo "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.write_iops_device

        Note: If both BW and IOPS rules are specified for a device, then IO is
        subjected to both the constraints.

blkio.throttle.io_serviced
        Number of IOs (bio) issued to the disk by the group. These
        are further divided by the type of operation - read or write, sync
        or async. First two fields specify the major and minor number of the
        device, third field specifies the operation type and the fourth field
        specifies the number of IOs.

blkio.throttle.io_service_bytes
        Number of bytes transferred to/from the disk by the group. These
        are further divided by the type of operation - read or write, sync
        or async. First two fields specify the major and minor number of the
        device, third field specifies the operation type and the fourth field
        specifies the number of bytes.
”h]”je  )”}”(hhh]”(jj  )”}”(hX  blkio.throttle.read_bps_device
Specifies upper limit on READ rate from the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format::

  echo "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.read_bps_device
”h]”(jp  )”}”(hŒblkio.throttle.read_bps_device”h]”hŒblkio.throttle.read_bps_device”…””}”(hjë  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Mhjç  ubj€  )”}”(hhh]”(hÝ)”}”(hŒSpecifies upper limit on READ rate from the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format::”h]”hŒŒSpecifies upper limit on READ rate from the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format:”…””}”(hjü  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Kýhjù  ubj3  )”}”(hŒVecho "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.read_bps_device”h]”hŒVecho "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.read_bps_device”…””}”hj
  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Mhjù  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hjç  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Mhjä  ubjj  )”}”(hX  blkio.throttle.write_bps_device
Specifies upper limit on WRITE rate to the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format::

  echo "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.write_bps_device
”h]”(jp  )”}”(hŒblkio.throttle.write_bps_device”h]”hŒblkio.throttle.write_bps_device”…””}”(hj(  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Mhj$  ubj€  )”}”(hhh]”(hÝ)”}”(hŒŒSpecifies upper limit on WRITE rate to the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format::”h]”hŒ‹Specifies upper limit on WRITE rate to the device. IO rate is
specified in bytes per second. Rules are per device. Following is
the format:”…””}”(hj9  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Mhj6  ubj3  )”}”(hŒWecho "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.write_bps_device”h]”hŒWecho "<major>:<minor>  <rate_bytes_per_second>" > /cgrp/blkio.throttle.write_bps_device”…””}”hjG  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Mhj6  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hj$  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Mhjä  ubjj  )”}”(hX  blkio.throttle.read_iops_device
Specifies upper limit on READ rate from the device. IO rate is
specified in IO per second. Rules are per device. Following is
the format::

 echo "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.read_iops_device
”h]”(jp  )”}”(hŒblkio.throttle.read_iops_device”h]”hŒblkio.throttle.read_iops_device”…””}”(hje  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Mhja  ubj€  )”}”(hhh]”(hÝ)”}”(hŒŠSpecifies upper limit on READ rate from the device. IO rate is
specified in IO per second. Rules are per device. Following is
the format::”h]”hŒ‰Specifies upper limit on READ rate from the device. IO rate is
specified in IO per second. Rules are per device. Following is
the format:”…””}”(hjv  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Mhjs  ubj3  )”}”(hŒTecho "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.read_iops_device”h]”hŒTecho "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.read_iops_device”…””}”hj„  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Mhjs  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hja  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Mhjä  ubjj  )”}”(hXo  blkio.throttle.write_iops_device
Specifies upper limit on WRITE rate to the device. IO rate is
specified in io per second. Rules are per device. Following is
the format::

  echo "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.write_iops_device

Note: If both BW and IOPS rules are specified for a device, then IO is
subjected to both the constraints.
”h]”(jp  )”}”(hŒ blkio.throttle.write_iops_device”h]”hŒ blkio.throttle.write_iops_device”…””}”(hj¢  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´Mhjž  ubj€  )”}”(hhh]”(hÝ)”}”(hŒ‰Specifies upper limit on WRITE rate to the device. IO rate is
specified in io per second. Rules are per device. Following is
the format::”h]”hŒˆSpecifies upper limit on WRITE rate to the device. IO rate is
specified in io per second. Rules are per device. Following is
the format:”…””}”(hj³  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Mhj°  ubj3  )”}”(hŒUecho "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.write_iops_device”h]”hŒUecho "<major>:<minor>  <rate_io_per_second>" > /cgrp/blkio.throttle.write_iops_device”…””}”hjÁ  sbah}”(h]”h ]”h"]”h$]”h&]”jB  jC  uh1j2  h³hÊh´Mhj°  ubhÝ)”}”(hŒiNote: If both BW and IOPS rules are specified for a device, then IO is
subjected to both the constraints.”h]”hŒiNote: If both BW and IOPS rules are specified for a device, then IO is
subjected to both the constraints.”…””}”(hjÏ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Mhj°  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hjž  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´Mhjä  ubjj  )”}”(hXA  blkio.throttle.io_serviced
Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.
”h]”(jp  )”}”(hŒblkio.throttle.io_serviced”h]”hŒblkio.throttle.io_serviced”…””}”(hjí  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´M hjé  ubj€  )”}”(hhh]”hÝ)”}”(hX%  Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.”h]”hX%  Number of IOs (bio) issued to the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of IOs.”…””}”(hjþ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´Mhjû  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjé  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´M hjä  ubjj  )”}”(hXN  blkio.throttle.io_service_bytes
Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.
”h]”(jp  )”}”(hŒblkio.throttle.io_service_bytes”h]”hŒblkio.throttle.io_service_bytes”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´M'hj  ubj€  )”}”(hhh]”hÝ)”}”(hX-  Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.”h]”hX-  Number of bytes transferred to/from the disk by the group. These
are further divided by the type of operation - read or write, sync
or async. First two fields specify the major and minor number of the
device, third field specifies the operation type and the fourth field
specifies the number of bytes.”…””}”(hj-  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´M#hj*  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´M'hjä  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jd  hjà  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j^  h³hÊh´KühjÏ  h²hubeh}”(h]”Œ#throttling-upper-limit-policy-files”ah ]”h"]”Œ#throttling/upper limit policy files”ah$]”h&]”uh1hµhj  h²hh³hÊh´Kûubh¶)”}”(hhh]”(h»)”}”(hŒ#Common files among various policies”h]”hŒ#Common files among various policies”…””}”(hj^  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj[  h²hh³hÊh´M*ubj_  )”}”(hŒublkio.reset_stats
        Writing an int to this file will result in resetting all the stats
        for that cgroup.”h]”je  )”}”(hhh]”jj  )”}”(hŒeblkio.reset_stats
Writing an int to this file will result in resetting all the stats
for that cgroup.”h]”(jp  )”}”(hŒblkio.reset_stats”h]”hŒblkio.reset_stats”…””}”(hjw  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jo  h³hÊh´M,hjs  ubj€  )”}”(hhh]”hÝ)”}”(hŒSWriting an int to this file will result in resetting all the stats
for that cgroup.”h]”hŒSWriting an int to this file will result in resetting all the stats
for that cgroup.”…””}”(hjˆ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÜh³hÊh´M,hj…  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjs  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1ji  h³hÊh´M,hjp  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jd  hjl  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j^  h³hÊh´M+hj[  h²hubeh}”(h]”Œ#common-files-among-various-policies”ah ]”h"]”Œ#common files among various policies”ah$]”h&]”uh1hµhj  h²hh³hÊh´M*ubeh}”(h]”Œdetails-of-cgroup-files”ah ]”h"]”Œdetails of cgroup files”ah$]”h&]”uh1hµhh·h²hh³hÊh´K_ubeh}”(h]”Œblock-io-controller”ah ]”h"]”Œblock io controller”ah$]”h&]”uh1hµhhh²hh³hÊh´Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”hÊuh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(hºNŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
source_url”NŒtoc_backlinks”Œentry”Œfootnote_backlinks”KŒsectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒstrip_classes”NŒreport_level”KŒ
halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ	traceback”ˆŒinput_encoding”Œ	utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jé  Œerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œlanguage_code”Œen”Œrecord_dependencies”NŒconfig”NŒ	id_prefix”hŒauto_id_prefix”Œid”Œdump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”hÊŒ_destination”NŒ_config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ	tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œdocinfo_xform”KŒsectsubtitle_xform”‰Œimage_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”(jÃ  jÀ  hÿhüjÝ  jÚ  jÕ  jÒ  jJ  jG  j  j
  j»  j¸  jÌ  jÉ  jX  jU  j³  j°  uŒ	nametypes”}”(jÃ  ‰hÿ‰jÝ  ‰jÕ  ‰jJ  ‰j  ‰j»  ‰jÌ  ‰jX  ‰j³  ‰uh}”(jÀ  h·hühËjÚ  j  jÒ  j  jG  jà  j
  jM  j¸  j  jÉ  j!  jU  jÏ  j°  j[  uŒfootnote_refs”}”Œcitation_refs”}”Œautofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ	footnotes”]”Œ	citations”]”Œautofootnote_start”KŒsymbol_footnote_start”K Œ
id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
decoration”Nh²hub.