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Date: Mon, 18 May 2015 09:30:20 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jiri Olsa <jolsa@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Andi Kleen <andi@...stfloor.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 05/40] perf tools: Introduce perf_evlist__mmap_track()
The perf_evlist__mmap_track function creates data mmaps and optionally
tracking mmaps for events. It'll be used for perf record to save events
in a separate files and build an index table. Checking dummy tracking
event in perf_evlist__mmap() alone is not enough as users can specify a
dummy event (like in keep tracking testcase) without the index option.
Cc: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/builtin-record.c | 2 +-
tools/perf/util/evlist.c | 13 ++++++++-----
tools/perf/util/evlist.h | 2 +-
3 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 7d7ef5a1b0a6..21f7edb23370 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -304,7 +304,7 @@ static int record__open(struct record *rec)
if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
opts->auxtrace_mmap_pages,
- opts->auxtrace_snapshot_mode) < 0) {
+ opts->auxtrace_snapshot_mode, false) < 0) {
if (errno == EPERM) {
pr_err("Permission error mapping pages.\n"
"Consider increasing "
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5db249eb4dcd..303249467672 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -863,6 +863,7 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist, bool track_mmap)
struct mmap_params {
int prot;
+ bool track;
size_t len;
struct auxtrace_mmap_params auxtrace_mp;
};
@@ -913,7 +914,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
fd = FD(evsel, cpu, thread);
- if (perf_evsel__is_dummy_tracking(evsel)) {
+ if (mp->track && perf_evsel__is_dummy_tracking(evsel)) {
struct mmap_params track_mp = {
.prot = mp->prot,
.len = TRACK_MMAP_SIZE,
@@ -971,7 +972,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
thread);
}
- if (perf_evsel__is_dummy_tracking(evsel)) {
+ if (mp->track && perf_evsel__is_dummy_tracking(evsel)) {
/* restore idx as normal idx (positive) */
idx = track_mmap_idx(idx);
}
@@ -1138,6 +1139,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
* @overwrite: overwrite older events?
* @auxtrace_pages - auxtrace map length in pages
* @auxtrace_overwrite - overwrite older auxtrace data?
+ * @use_track_mmap: use another mmaps to track meta events
*
* If @overwrite is %false the user needs to signal event consumption using
* perf_mmap__write_tail(). Using perf_evlist__mmap_read() does this
@@ -1150,16 +1152,17 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
*/
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
bool overwrite, unsigned int auxtrace_pages,
- bool auxtrace_overwrite)
+ bool auxtrace_overwrite, bool use_track_mmap)
{
struct perf_evsel *evsel;
const struct cpu_map *cpus = evlist->cpus;
const struct thread_map *threads = evlist->threads;
struct mmap_params mp = {
.prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
+ .track = use_track_mmap,
};
- if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist, true) < 0)
+ if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist, mp.track) < 0)
return -ENOMEM;
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
@@ -1189,7 +1192,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
bool overwrite)
{
- return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
+ return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false, false);
}
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 335988577c18..27453338a8f5 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -135,7 +135,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt,
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
bool overwrite, unsigned int auxtrace_pages,
- bool auxtrace_overwrite);
+ bool auxtrace_overwrite, bool use_track_mmap);
int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
bool overwrite);
void perf_evlist__munmap(struct perf_evlist *evlist);
--
2.4.0
--
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