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# SPDX-License-Identifier: GPL-2.0
import argparse
import os
import _damon
class PaddrRange:
start = None
end = None
nid = None
state = None
name = None
def __init__(self, start, end, nid, state, name):
self.start = start
self.end = end
self.nid = nid
self.state = state
self.name = name
def __str__(self):
return '%x-%x, nid %s, state %s, name %s' % (self.start, self.end,
self.nid, self.state, self.name)
class MemBlock:
nid = None
index = None
state = None
def __init__(self, nid, index, state):
self.nid = nid
self.index = index
self.state = state
def __str__(self):
return '%d (%s)' % (self.index, self.state)
def __repr__(self):
return self.__str__()
def readfile(file_path):
with open(file_path, 'r') as f:
return f.read()
def collapse_ranges(ranges):
ranges = sorted(ranges, key=lambda x: x.start)
merged = []
for r in ranges:
if not merged:
merged.append(r)
continue
last = merged[-1]
if last.end != r.start or last.nid != r.nid or last.state != r.state:
merged.append(r)
else:
last.end = r.end
return merged
def memblocks_to_ranges(blocks, block_size):
ranges = []
for b in blocks:
ranges.append(PaddrRange(b.index * block_size,
(b.index + 1) * block_size, b.nid, b.state, None))
return collapse_ranges(ranges)
def memblock_ranges():
SYSFS='/sys/devices/system/node'
sz_block = int(readfile('/sys/devices/system/memory/block_size_bytes'), 16)
sys_nodes = [x for x in os.listdir(SYSFS) if x.startswith('node')]
blocks = []
for sys_node in sys_nodes:
nid = int(sys_node[4:])
sys_node_files = os.listdir(os.path.join(SYSFS, sys_node))
for f in sys_node_files:
if not f.startswith('memory'):
continue
if f[6:] == '_failure':
continue
index = int(f[6:])
sys_state = os.path.join(SYSFS, sys_node, f, 'state')
state = readfile(sys_state).strip()
blocks.append(MemBlock(nid, index, state))
return memblocks_to_ranges(blocks, sz_block)
def iomem_ranges():
ranges = []
with open('/proc/iomem', 'r') as f:
# example of the line: '100000000-42b201fff : System RAM'
for line in f:
fields = line.split(':')
if len(fields) < 2:
continue
name = ':'.join(fields[1:]).strip()
addrs = fields[0].split('-')
if len(addrs) != 2:
continue
start = int(addrs[0], 16)
end = int(addrs[1], 16) + 1
ranges.append(PaddrRange(start, end, None, None, name))
return ranges
def integrate(memblock_parsed, iomem_parsed):
merged = []
for r in iomem_parsed:
for r2 in memblock_parsed:
if r2.start <= r.start and r.end <= r2.end:
r.nid = r2.nid
r.state = r2.state
merged.append(r)
elif r2.start <= r.start and r.start < r2.end and r2.end < r.end:
sub = PaddrRange(r2.end, r.end, None, None, r.name)
iomem_parsed.append(sub)
r.end = r2.end
r.nid = r2.nid
r.state = r2.state
merged.append(r)
merged = sorted(merged, key=lambda x: x.start)
return merged
def paddr_ranges():
return integrate(memblock_ranges(), iomem_ranges())
def pr_ranges(ranges):
print('#%12s %13s\tnode\tstate\tresource\tsize' % ('start', 'end'))
for r in ranges:
print('%13d %13d\t%s\t%s\t%s\t%d' % (r.start, r.end, r.nid,
r.state, r.name, r.end - r.start))
def default_paddr_region():
"Largest System RAM region becomes the default"
ret = []
with open('/proc/iomem', 'r') as f:
# example of the line: '100000000-42b201fff : System RAM'
for line in f:
fields = line.split(':')
if len(fields) != 2:
continue
name = fields[1].strip()
if not name.startswith('System RAM'):
continue
addrs = fields[0].split('-')
if len(addrs) != 2:
continue
start = int(addrs[0], 16)
end = int(addrs[1], 16)
sz_region = end - start
if not ret or sz_region > (ret[1] - ret[0]):
ret = [start, end]
return ret
def paddr_region_of(numa_node):
if not os.path.isdir('/sys/devices/system/memory'):
return None, '/sys/devices/system/memory not found. You may need CONFIG_MEMORY_HOTPLUG enabled.'
regions = []
paddr_ranges_ = paddr_ranges()
for r in paddr_ranges_:
if r.nid == numa_node and r.name.startswith('System RAM'):
regions.append([r.start, r.end])
return regions, None
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--numa_node', type=int, metavar='<node id>',
help='print ranges of this numa node only')
args = parser.parse_args()
_damon.ensure_root_permission()
ranges = []
for r in paddr_ranges():
if args.numa_node and r.nid != args.numa_node:
continue
ranges.append(r)
pr_ranges(ranges)
print('largest system RAM region: %s' % default_paddr_region())
if __name__ == '__main__':
main()
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