From: John Levon The below patch passes samples from anonymous regions to userspace instead of just dropping them. This provides the support needed for reporting anonymous-region code samples (today: basic accumulated results; later: Java and other dynamically compiled code). As this changes the format, an upgrade to the just-released 0.9 release of the userspace tools is required. This patch is based upon an earlier one by Will Cohen Signed-off-by: John Levon Signed-off-by: Andrew Morton --- Documentation/Changes | 2 +- Documentation/basic_profiling.txt | 10 +++++++--- drivers/oprofile/buffer_sync.c | 29 ++++++++++++++++++----------- drivers/oprofile/event_buffer.h | 3 +++ 4 files changed, 29 insertions(+), 15 deletions(-) diff -puN Documentation/basic_profiling.txt~oprofile-report-anonymous-region-samples Documentation/basic_profiling.txt --- 25/Documentation/basic_profiling.txt~oprofile-report-anonymous-region-samples 2005-06-01 12:43:38.000000000 -0700 +++ 25-akpm/Documentation/basic_profiling.txt 2005-06-01 12:43:38.000000000 -0700 @@ -27,9 +27,13 @@ dump output readprofile -m /boot/System. Oprofile -------- -Get the source (I use 0.8) from http://oprofile.sourceforge.net/ -and add "idle=poll" to the kernel command line + +Get the source (see Changes for required version) from +http://oprofile.sourceforge.net/ and add "idle=poll" to the kernel command +line. + Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel + ./configure --with-kernel-support make install @@ -46,7 +50,7 @@ start opcontrol --start stop opcontrol --stop dump output opreport > output_file -To only report on the kernel, run opreport /boot/vmlinux > output_file +To only report on the kernel, run opreport -l /boot/vmlinux > output_file A reset is needed to clear old statistics, which survive a reboot. diff -puN Documentation/Changes~oprofile-report-anonymous-region-samples Documentation/Changes --- 25/Documentation/Changes~oprofile-report-anonymous-region-samples 2005-06-01 12:43:38.000000000 -0700 +++ 25-akpm/Documentation/Changes 2005-06-01 12:43:38.000000000 -0700 @@ -63,7 +63,7 @@ o PPP 2.4.0 o isdn4k-utils 3.1pre1 # isdnctrl 2>&1|grep version o nfs-utils 1.0.5 # showmount --version o procps 3.2.0 # ps --version -o oprofile 0.5.3 # oprofiled --version +o oprofile 0.9 # oprofiled --version Kernel compilation ================== diff -puN drivers/oprofile/buffer_sync.c~oprofile-report-anonymous-region-samples drivers/oprofile/buffer_sync.c --- 25/drivers/oprofile/buffer_sync.c~oprofile-report-anonymous-region-samples 2005-06-01 12:43:38.000000000 -0700 +++ 25-akpm/drivers/oprofile/buffer_sync.c 2005-06-01 12:43:38.000000000 -0700 @@ -206,7 +206,7 @@ static inline unsigned long fast_get_dco */ static unsigned long get_exec_dcookie(struct mm_struct * mm) { - unsigned long cookie = 0; + unsigned long cookie = NO_COOKIE; struct vm_area_struct * vma; if (!mm) @@ -234,35 +234,42 @@ out: */ static unsigned long lookup_dcookie(struct mm_struct * mm, unsigned long addr, off_t * offset) { - unsigned long cookie = 0; + unsigned long cookie = NO_COOKIE; struct vm_area_struct * vma; for (vma = find_vma(mm, addr); vma; vma = vma->vm_next) { - if (!vma->vm_file) - continue; - if (addr < vma->vm_start || addr >= vma->vm_end) continue; - cookie = fast_get_dcookie(vma->vm_file->f_dentry, - vma->vm_file->f_vfsmnt); - *offset = (vma->vm_pgoff << PAGE_SHIFT) + addr - vma->vm_start; + if (vma->vm_file) { + cookie = fast_get_dcookie(vma->vm_file->f_dentry, + vma->vm_file->f_vfsmnt); + *offset = (vma->vm_pgoff << PAGE_SHIFT) + addr - + vma->vm_start; + } else { + /* must be an anonymous map */ + *offset = addr; + } + break; } + if (!vma) + cookie = INVALID_COOKIE; + return cookie; } -static unsigned long last_cookie = ~0UL; +static unsigned long last_cookie = INVALID_COOKIE; static void add_cpu_switch(int i) { add_event_entry(ESCAPE_CODE); add_event_entry(CPU_SWITCH_CODE); add_event_entry(i); - last_cookie = ~0UL; + last_cookie = INVALID_COOKIE; } static void add_kernel_ctx_switch(unsigned int in_kernel) @@ -317,7 +324,7 @@ static int add_us_sample(struct mm_struc cookie = lookup_dcookie(mm, s->eip, &offset); - if (!cookie) { + if (cookie == INVALID_COOKIE) { atomic_inc(&oprofile_stats.sample_lost_no_mapping); return 0; } diff -puN drivers/oprofile/event_buffer.h~oprofile-report-anonymous-region-samples drivers/oprofile/event_buffer.h --- 25/drivers/oprofile/event_buffer.h~oprofile-report-anonymous-region-samples 2005-06-01 12:43:38.000000000 -0700 +++ 25-akpm/drivers/oprofile/event_buffer.h 2005-06-01 12:43:38.000000000 -0700 @@ -35,6 +35,9 @@ void wake_up_buffer_waiter(void); #define TRACE_BEGIN_CODE 8 #define TRACE_END_CODE 9 +#define INVALID_COOKIE ~0UL +#define NO_COOKIE 0UL + /* add data to the event buffer */ void add_event_entry(unsigned long data); _