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perf tools: Use sscanf for parsing /proc/pid/maps 

When reading those files to synthesize MMAP events.  It makes the code
shorter and cleaner.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1352643651-13891-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2012-11-11 23:20:50 +09:00 committed by Arnaldo Carvalho de Melo
parent 0020ce2386
commit 6064803313
1 changed files with 28 additions and 40 deletions
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68
tools/perf/util/event.c
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@ -193,55 +193,43 @@ static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
event->header.misc = PERF_RECORD_MISC_USER;
while (1) {
char bf[BUFSIZ], *pbf = bf;
int n;
char bf[BUFSIZ];
char prot[5];
char execname[PATH_MAX];
char anonstr[] = "//anon";
size_t size;
if (fgets(bf, sizeof(bf), fp) == NULL)
break;
/* ensure null termination since stack will be reused. */
strcpy(execname, "");
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
n = hex2u64(pbf, &event->mmap.start);
if (n < 0)
sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
&event->mmap.start, &event->mmap.len, prot,
&event->mmap.pgoff, execname);
if (prot[2] != 'x')
continue;
pbf += n + 1;
n = hex2u64(pbf, &event->mmap.len);
if (n < 0)
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
char anonstr[] = "//anon\n";
char *execname = strchr(bf, '/');
/* Catch VDSO */
if (execname == NULL)
execname = strstr(bf, "[vdso]");
if (!strcmp(execname, ""))
strcpy(execname, anonstr);
/* Catch anonymous mmaps */
if ((execname == NULL) && !strstr(bf, "["))
execname = anonstr;
size = strlen(execname) + 1;
memcpy(event->mmap.filename, execname, size);
size = PERF_ALIGN(size, sizeof(u64));
event->mmap.len -= event->mmap.start;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size));
memset(event->mmap.filename + size, 0, machine->id_hdr_size);
event->mmap.header.size += machine->id_hdr_size;
event->mmap.pid = tgid;
event->mmap.tid = pid;
if (execname == NULL)
continue;
pbf += 3;
n = hex2u64(pbf, &event->mmap.pgoff);
size = strlen(execname);
execname[size - 1] = '\0'; /* Remove \n */
memcpy(event->mmap.filename, execname, size);
size = PERF_ALIGN(size, sizeof(u64));
event->mmap.len -= event->mmap.start;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size));
memset(event->mmap.filename + size, 0, machine->id_hdr_size);
event->mmap.header.size += machine->id_hdr_size;
event->mmap.pid = tgid;
event->mmap.tid = pid;
if (process(tool, event, &synth_sample, machine) != 0) {
rc = -1;
break;
}
if (process(tool, event, &synth_sample, machine) != 0) {
rc = -1;
break;
}
}