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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 <[email protected]>
Acked-by: Paul Mackerras <[email protected]>
Cc: Andrew Morton <[email protected]>
Orig-LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2009-03-30 19:07:05 +02:00 • committed by Ingo Molnar
commit 0a4a93919b
3 changed files with 177 additions and 2 deletions
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10
mm/mmap.c
View file

@ -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);