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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-03-30 19:07:05 +0200
committerIngo Molnar <mingo@elte.hu>2009-04-06 09:30:38 +0200
commit0a4a93919bdc5cee48fe4367591e8e0449c1086c (patch)
tree0f0d7ac3ee4f61c1e7e53f0ba4e3b01e0e4ac728 /mm/mmap.c
parent195564390210977954fe4ef45b39cdee34f41b59 (diff)
downloadvexpress-lsk-0a4a93919bdc5cee48fe4367591e8e0449c1086c.tar.gz
perf_counter: executable mmap() information
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>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 4a3841186c1..1df63f614f9 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -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);