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perf events: Fix mmap offset determination

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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 <[email protected]>
Cc: Will Deacon <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Dave Martin <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Dave Martin 2010-08-03 12:48:35 +01:00 • committed by Arnaldo Carvalho de Melo
commit b5a6325464
1 changed files with 1 additions and 7 deletions
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8
tools/perf/util/event.c
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@ -151,7 +151,6 @@ static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
u64 vm_pgoff;
char *execname = strchr(bf, '/');
/* Catch VDSO */
@ -162,12 +161,7 @@ static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
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 */