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authorArnaldo Carvalho de Melo <acme@redhat.com>2010-11-26 19:39:15 -0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-11-26 19:39:15 -0200
commitbaa2f6cedbfae962f04281a31f08ec29667d31a0 (patch)
tree6a644f86e234a03bf99518b76daec138016e3bca
parentaf86da5318136eb49c0453c2e2be3280ee5d18d9 (diff)
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perf record: Add option to disable collecting build-ids
Collecting build-ids for long running sessions may take a long time because it needs to traverse the whole just collected perf.data stream of events, marking the DSOs that had hits and then looking for the .note.gnu.build-id ELF section. For things like the 'trace' tool that records and right away consumes the data on systems where its unlikely that the DSOs being monitored will change while 'trace' runs, it is desirable to remove build id collection, so add a -B/--no-buildid option to perf record to allow such use case. Longer term we'll avoid all this if we, at DSO load time, in the kernel, take advantage of this slow code path to collect the build-id and stash it somewhere, so that we can insert it in the PERF_RECORD_MMAP event. Reported-by: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/builtin-record.c14
-rw-r--r--tools/perf/util/header.c11
-rw-r--r--tools/perf/util/header.h1
-rw-r--r--tools/perf/util/include/linux/bitops.h5
4 files changed, 26 insertions, 5 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 3d2cb489980..024e1441d76 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -61,6 +61,7 @@ static bool inherit_stat = false;
static bool no_samples = false;
static bool sample_address = false;
static bool no_buildid = false;
+static bool no_buildid_cache = false;
static long samples = 0;
static u64 bytes_written = 0;
@@ -437,7 +438,8 @@ static void atexit_header(void)
if (!pipe_output) {
session->header.data_size += bytes_written;
- process_buildids();
+ if (!no_buildid)
+ process_buildids();
perf_header__write(&session->header, output, true);
perf_session__delete(session);
symbol__exit();
@@ -557,6 +559,9 @@ static int __cmd_record(int argc, const char **argv)
return -1;
}
+ if (!no_buildid)
+ perf_header__set_feat(&session->header, HEADER_BUILD_ID);
+
if (!file_new) {
err = perf_header__read(session, output);
if (err < 0)
@@ -831,8 +836,10 @@ const struct option record_options[] = {
"Sample addresses"),
OPT_BOOLEAN('n', "no-samples", &no_samples,
"don't sample"),
- OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid,
+ OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
"do not update the buildid cache"),
+ OPT_BOOLEAN('B', "no-buildid", &no_buildid,
+ "do not collect buildids in perf.data"),
OPT_END()
};
@@ -857,7 +864,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
}
symbol__init();
- if (no_buildid)
+
+ if (no_buildid_cache || no_buildid)
disable_buildid_cache();
if (!nr_counters) {
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index d7e67b167ea..f65d7dc127b 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -152,6 +152,11 @@ void perf_header__set_feat(struct perf_header *self, int feat)
set_bit(feat, self->adds_features);
}
+void perf_header__clear_feat(struct perf_header *self, int feat)
+{
+ clear_bit(feat, self->adds_features);
+}
+
bool perf_header__has_feat(const struct perf_header *self, int feat)
{
return test_bit(feat, self->adds_features);
@@ -431,8 +436,10 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
int idx = 0, err;
session = container_of(self, struct perf_session, header);
- if (perf_session__read_build_ids(session, true))
- perf_header__set_feat(self, HEADER_BUILD_ID);
+
+ if (perf_header__has_feat(self, HEADER_BUILD_ID &&
+ !perf_session__read_build_ids(session, true)))
+ perf_header__clear_feat(self, HEADER_BUILD_ID);
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 402ac2454cf..ed550bffd65 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -84,6 +84,7 @@ u64 perf_header__sample_type(struct perf_header *header);
struct perf_event_attr *
perf_header__find_attr(u64 id, struct perf_header *header);
void perf_header__set_feat(struct perf_header *self, int feat);
+void perf_header__clear_feat(struct perf_header *self, int feat);
bool perf_header__has_feat(const struct perf_header *self, int feat);
int perf_header__process_sections(struct perf_header *self, int fd,
diff --git a/tools/perf/util/include/linux/bitops.h b/tools/perf/util/include/linux/bitops.h
index bb4ac2e0538..8be0b968ca0 100644
--- a/tools/perf/util/include/linux/bitops.h
+++ b/tools/perf/util/include/linux/bitops.h
@@ -13,6 +13,11 @@ static inline void set_bit(int nr, unsigned long *addr)
addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
}
+static inline void clear_bit(int nr, unsigned long *addr)
+{
+ addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
+}
+
static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
{
return ((1UL << (nr % BITS_PER_LONG)) &