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authorRobert Richter <robert.richter@amd.com>2011-12-07 10:02:55 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-12-23 17:02:22 -0200
commite20960c0271f91aead94746872fd976326a703b3 (patch)
treefdc1b932114df3a9e155e9f36cda93a4c11537ad /tools
parentefad14150a0b4429f37da7245001a8096ef7ee38 (diff)
downloadlinux-linaro-stable-e20960c0271f91aead94746872fd976326a703b3.tar.gz
perf tools: Unify handling of features when writing feature section
The features HEADER_TRACE_INFO and HEADER_BUILD_ID are handled different when writing the feature section. All other features are simply disabled on failure and writing the section goes on without returning an error. There is no reason for these special cases. This patch unifies handling of the features. This should be ok since all features can be parsed independently. Offset and size of a feature's block is stored in struct perf_file_ section right after the data block of perf.data (see perf_session__ write_header()). Thus, if a feature does not exist then other features can be processed anyway. Also moving special code for HEADER_BUILD_ID out to write_build_id(). v2: * perf record throws an error now if buildids may not be generated, which can be disabled with the --no-buildid option. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1323248577-11268-6-git-send-email-robert.richter@amd.com Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-record.c7
-rw-r--r--tools/perf/util/header.c14
2 files changed, 12 insertions, 9 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e873ae2dd54c..0abfb18b911f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -503,6 +503,13 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
return err;
}
+ if (!!rec->no_buildid
+ && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
+ pr_err("Couldn't generating buildids. "
+ "Use --no-buildid to profile anyway.\n");
+ return -1;
+ }
+
rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
machine = perf_session__find_host_machine(session);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 609d79b5fb5e..71326836921b 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -445,6 +445,9 @@ static int write_build_id(int fd, struct perf_header *h,
session = container_of(h, struct perf_session, header);
+ if (!perf_session__read_build_ids(session, true))
+ return -1;
+
err = dsos__write_buildid_table(h, fd);
if (err < 0) {
pr_debug("failed to write buildid table\n");
@@ -1417,10 +1420,6 @@ static int perf_header__adds_write(struct perf_header *header,
session = container_of(header, struct perf_session, header);
- if (perf_header__has_feat(header, HEADER_BUILD_ID &&
- !perf_session__read_build_ids(session, true)))
- perf_header__clear_feat(header, HEADER_BUILD_ID);
-
nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
@@ -1436,13 +1435,11 @@ static int perf_header__adds_write(struct perf_header *header,
err = do_write_feat(fd, header, HEADER_TRACE_INFO, &p, evlist);
if (err)
- goto out_free;
+ perf_header__clear_feat(header, HEADER_TRACE_INFO);
err = do_write_feat(fd, header, HEADER_BUILD_ID, &p, evlist);
- if (err) {
+ if (err)
perf_header__clear_feat(header, HEADER_BUILD_ID);
- goto out_free;
- }
err = do_write_feat(fd, header, HEADER_HOSTNAME, &p, evlist);
if (err)
@@ -1500,7 +1497,6 @@ static int perf_header__adds_write(struct perf_header *header,
err = do_write(fd, feat_sec, sec_size);
if (err < 0)
pr_debug("failed to write feature section\n");
-out_free:
free(feat_sec);
return err;
}