perf events: Fix mmap offset determination
Fix buggy-looking code which unnecessarily adjusts the file offset
fields read from /proc/*/maps.
This may have gone unnoticed since the offset is usually 0 (and the
logic in util/symbol.c may work incorrectly for other offset values).
Commiter note:
This fixes a bug introduced in 4af8b35, there is no need to shift pgoff
twice, the show_map_vma routine in fs/proc/task_mmu.c already converts
it from the number of pages to the size in bytes, and that is what
appears in /proc/PID/map.
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Will Deacon <Will.Deacon@arm.com>
LKML-Reference: <1280836116-6654-2-git-send-email-dave.martin@linaro.org>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 6b0db55..db8a1d4 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -151,7 +151,6 @@
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
- u64 vm_pgoff;
char *execname = strchr(bf, '/');
/* Catch VDSO */
@@ -162,12 +161,7 @@
continue;
pbf += 3;
- n = hex2u64(pbf, &vm_pgoff);
- /* pgoff is in bytes, not pages */
- if (n >= 0)
- ev.mmap.pgoff = vm_pgoff << getpagesize();
- else
- ev.mmap.pgoff = 0;
+ n = hex2u64(pbf, &ev.mmap.pgoff);
size = strlen(execname);
execname[size - 1] = '\0'; /* Remove \n */