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perf tools: Add support to read build id from compressed elf

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Adding support to decompress file before reading build id.

Adding filename__read_build_id and change its current versions to
read_build_id.

Shutting down stderr output of perf list in the shell test:
  82: Check open filename arg using perf trace + vfs_getname          : Ok

because with decompression code in the place we the
filename__read_build_id function is more verbose in case
of error and the test did not account for that.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201214105457.543111-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-12-14 11:54:48 +01:00 committed by Arnaldo Carvalho de Melo
parent 8abceacff8
commit 47dce51acc
2 changed files with 36 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/tests/shell/trace+probe_vfs_getname.sh
View File

@ -20,7 +20,7 @@ skip_if_no_perf_trace || exit 2
file=$(mktemp /tmp/temporary_file.XXXXX)
trace_open_vfs_getname() {
evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
evts=$(echo $(perf list syscalls:sys_enter_open* 2>/dev/null | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
perf trace -e $evts touch $file 2>&1 | \
egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
}

37
tools/perf/util/symbol-elf.c
View File

@ -534,7 +534,7 @@ out:
#ifdef HAVE_LIBBFD_BUILDID_SUPPORT
int filename__read_build_id(const char *filename, struct build_id *bid)
static int read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
int err = -1;
@ -563,7 +563,7 @@ out_close:
#else // HAVE_LIBBFD_BUILDID_SUPPORT
int filename__read_build_id(const char *filename, struct build_id *bid)
static int read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);
int fd, err = -1;
@ -595,6 +595,39 @@ out:
#endif // HAVE_LIBBFD_BUILDID_SUPPORT
int filename__read_build_id(const char *filename, struct build_id *bid)
{
struct kmod_path m = { .name = NULL, };
char path[PATH_MAX];
int err;
if (!filename)
return -EFAULT;
err = kmod_path__parse(&m, filename);
if (err)
return -1;
if (m.comp) {
int error = 0, fd;
fd = filename__decompress(filename, path, sizeof(path), m.comp, &error);
if (fd < 0) {
pr_debug("Failed to decompress (error %d) %s\n",
error, filename);
return -1;
}
close(fd);
filename = path;
}
err = read_build_id(filename, bid);
if (m.comp)
unlink(filename);
return err;
}
int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
size_t size = sizeof(bid->data);