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perf_counter: executable mmap() information

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Currently the profiling information returns userspace IPs but no way
to correlate them to userspace code. Userspace could look into
/proc/$pid/maps but that might not be current or even present anymore
at the time of analyzing the IPs.

Therefore provide means to track the mmap information and provide it
in the output stream.

XXX: only covers mmap()/munmap(), mremap() and mprotect() are missing.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Orig-LKML-Reference: <20090330171023.417259499@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-03-30 19:07:05 +02:00
committed by Ingo Molnar
parent 1955643902
commit 0a4a93919b
3 changed files with 177 additions and 2 deletions
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10
mm/mmap.c
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@@ -28,6 +28,7 @@
#include <linux/mempolicy.h>
#include <linux/rmap.h>
#include <linux/mmu_notifier.h>
#include <linux/perf_counter.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
@@ -1223,6 +1224,9 @@ munmap_back:
if (correct_wcount)
atomic_inc(&inode->i_writecount);
out:
if (vm_flags & VM_EXEC)
perf_counter_mmap(addr, len, pgoff, file);
mm->total_vm += len >> PAGE_SHIFT;
vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
if (vm_flags & VM_LOCKED) {
@@ -1756,6 +1760,12 @@ static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma)
do {
long nrpages = vma_pages(vma);
if (vma->vm_flags & VM_EXEC) {
perf_counter_munmap(vma->vm_start,
nrpages << PAGE_SHIFT,
vma->vm_pgoff, vma->vm_file);
}
mm->total_vm -= nrpages;
vm_stat_account(mm, vma->vm_flags, vma->vm_file, -nrpages);
vma = remove_vma(vma);