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author | 2015-04-30 17:37:31 +0300 | |
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committer | 2015-05-05 18:13:00 -0300 | |
commit | d20031bb63dd6dde35feb7845eaf17c620eef120 (patch) | |
tree | b36fd419c0ef1459ef4cfe1b000e1b4a3c65e6f2 /tools/perf/util/auxtrace.c | |
parent | perf tools: Add support for PERF_RECORD_ITRACE_START (diff) | |
download | linux-d20031bb63dd6dde35feb7845eaf17c620eef120.tar.gz linux-d20031bb63dd6dde35feb7845eaf17c620eef120.tar.bz2 linux-d20031bb63dd6dde35feb7845eaf17c620eef120.zip |
perf tools: Add AUX area tracing Snapshot Mode
Add support for making snapshots of AUX area tracing data.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1430404667-10593-9-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/auxtrace.c')
-rw-r--r-- | tools/perf/util/auxtrace.c | 85 |
1 files changed, 75 insertions, 10 deletions
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index 129371048fc1..df66966cfde7 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -504,6 +504,29 @@ void auxtrace_record__free(struct auxtrace_record *itr) itr->free(itr); } +int auxtrace_record__snapshot_start(struct auxtrace_record *itr) +{ + if (itr && itr->snapshot_start) + return itr->snapshot_start(itr); + return 0; +} + +int auxtrace_record__snapshot_finish(struct auxtrace_record *itr) +{ + if (itr && itr->snapshot_finish) + return itr->snapshot_finish(itr); + return 0; +} + +int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx, + struct auxtrace_mmap *mm, + unsigned char *data, u64 *head, u64 *old) +{ + if (itr && itr->find_snapshot) + return itr->find_snapshot(itr, idx, mm, data, head, old); + return 0; +} + int auxtrace_record__options(struct auxtrace_record *itr, struct perf_evlist *evlist, struct record_opts *opts) @@ -520,6 +543,19 @@ u64 auxtrace_record__reference(struct auxtrace_record *itr) return 0; } +int auxtrace_parse_snapshot_options(struct auxtrace_record *itr, + struct record_opts *opts, const char *str) +{ + if (!str) + return 0; + + if (itr) + return itr->parse_snapshot_options(itr, opts, str); + + pr_err("No AUX area tracing to snapshot\n"); + return -EINVAL; +} + struct auxtrace_record *__weak auxtrace_record__init(struct perf_evlist *evlist __maybe_unused, int *err) { @@ -1077,16 +1113,26 @@ int perf_event__process_auxtrace_error(struct perf_tool *tool __maybe_unused, return 0; } -int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr, - struct perf_tool *tool, process_auxtrace_t fn) +static int __auxtrace_mmap__read(struct auxtrace_mmap *mm, + struct auxtrace_record *itr, + struct perf_tool *tool, process_auxtrace_t fn, + bool snapshot, size_t snapshot_size) { - u64 head = auxtrace_mmap__read_head(mm); - u64 old = mm->prev, offset, ref; + u64 head, old = mm->prev, offset, ref; unsigned char *data = mm->base; size_t size, head_off, old_off, len1, len2, padding; union perf_event ev; void *data1, *data2; + if (snapshot) { + head = auxtrace_mmap__read_snapshot_head(mm); + if (auxtrace_record__find_snapshot(itr, mm->idx, mm, data, + &head, &old)) + return -1; + } else { + head = auxtrace_mmap__read_head(mm); + } + if (old == head) return 0; @@ -1106,6 +1152,9 @@ int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr, else size = mm->len - (old_off - head_off); + if (snapshot && size > snapshot_size) + size = snapshot_size; + ref = auxtrace_record__reference(itr); if (head > old || size <= head || mm->mask) { @@ -1153,18 +1202,34 @@ int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr, mm->prev = head; - auxtrace_mmap__write_tail(mm, head); - if (itr->read_finish) { - int err; + if (!snapshot) { + auxtrace_mmap__write_tail(mm, head); + if (itr->read_finish) { + int err; - err = itr->read_finish(itr, mm->idx); - if (err < 0) - return err; + err = itr->read_finish(itr, mm->idx); + if (err < 0) + return err; + } } return 1; } +int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr, + struct perf_tool *tool, process_auxtrace_t fn) +{ + return __auxtrace_mmap__read(mm, itr, tool, fn, false, 0); +} + +int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm, + struct auxtrace_record *itr, + struct perf_tool *tool, process_auxtrace_t fn, + size_t snapshot_size) +{ + return __auxtrace_mmap__read(mm, itr, tool, fn, true, snapshot_size); +} + /** * struct auxtrace_cache - hash table to implement a cache * @hashtable: the hashtable |