[tip:perf/core] perf evlist: Map backward events to backward_mmap

From: tip-bot for Wang Nan
Date: Sat Jul 16 2016 - 16:49:12 EST

Commit-ID: 078c33862e042b3778dce3bcc8eaef84ab40715c
Gitweb: http://git.kernel.org/tip/078c33862e042b3778dce3bcc8eaef84ab40715c
Author: Wang Nan <wangnan0@xxxxxxxxxx>
AuthorDate: Thu, 14 Jul 2016 08:34:40 +0000
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 15 Jul 2016 17:27:48 -0300

perf evlist: Map backward events to backward_mmap

In perf_evlist__mmap_per_evsel(), select backward_mmap for backward
events. Utilize new perf_mmap APIs. Dynamically alloc backward_mmap.

Remove useless functions.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Nilay Vaish <nilayvaish@xxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
Link: http://lkml.kernel.org/r/1468485287-33422-9-git-send-email-wangnan0@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/tests/backward-ring-buffer.c | 4 +--
tools/perf/util/evlist.c | 54 ++++++++++++++++-----------------
2 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c
index 5cee387..b2c6348 100644
--- a/tools/perf/tests/backward-ring-buffer.c
+++ b/tools/perf/tests/backward-ring-buffer.c
@@ -31,8 +31,8 @@ static int count_samples(struct perf_evlist *evlist, int *sample_count,
for (i = 0; i < evlist->nr_mmaps; i++) {
union perf_event *event;

- perf_evlist__mmap_read_catchup(evlist, i);
- while ((event = perf_evlist__mmap_read_backward(evlist, i)) != NULL) {
+ perf_mmap__read_catchup(&evlist->backward_mmap[i]);
+ while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != NULL) {
const u32 type = event->header.type;

switch (type) {
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 24927e1..7570f90 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -27,7 +27,6 @@
#include <linux/log2.h>
#include <linux/err.h>

-static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
static void perf_mmap__munmap(struct perf_mmap *map);
static void perf_mmap__put(struct perf_mmap *map);

@@ -692,8 +691,11 @@ static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
{
int i;

+ if (!evlist->backward_mmap)
+ return 0;
+
for (i = 0; i < evlist->nr_mmaps; i++) {
- int fd = evlist->mmap[i].fd;
+ int fd = evlist->backward_mmap[i].fd;
int err;

if (fd < 0)
@@ -904,16 +906,6 @@ static void perf_mmap__put(struct perf_mmap *md)
perf_mmap__munmap(md);
}

-static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
-{
- perf_mmap__get(&evlist->mmap[idx]);
-}
-
-static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
-{
- perf_mmap__put(&evlist->mmap[idx]);
-}
-
void perf_mmap__consume(struct perf_mmap *md, bool overwrite)
{
if (!overwrite) {
@@ -1049,12 +1041,6 @@ static int perf_mmap__mmap(struct perf_mmap *map,
return 0;
}

-static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
- struct mmap_params *mp, int fd)
-{
- return perf_mmap__mmap(&evlist->mmap[idx], mp, fd);
-}
-
static bool
perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
struct perf_evsel *evsel)
@@ -1066,16 +1052,27 @@ perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,

static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
struct mmap_params *mp, int cpu,
- int thread, int *output)
+ int thread, int *_output, int *_output_backward)
{
struct perf_evsel *evsel;
int revent;

evlist__for_each_entry(evlist, evsel) {
+ struct perf_mmap *maps = evlist->mmap;
+ int *output = _output;
int fd;

- if (!!evsel->attr.write_backward != (evlist->overwrite && evlist->backward))
- continue;
+ if (evsel->attr.write_backward) {
+ output = _output_backward;
+ maps = evlist->backward_mmap;
+
+ if (!maps) {
+ maps = perf_evlist__alloc_mmap(evlist);
+ if (!maps)
+ return -1;
+ evlist->backward_mmap = maps;
+ }
+ }

if (evsel->system_wide && thread)
continue;
@@ -1084,13 +1081,14 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,

if (*output == -1) {
*output = fd;
- if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0)
+
+ if (perf_mmap__mmap(&maps[idx], mp, *output) < 0)
return -1;
} else {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
return -1;

- perf_evlist__mmap_get(evlist, idx);
+ perf_mmap__get(&maps[idx]);
}

revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
@@ -1103,8 +1101,8 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
* Therefore don't add it for polling.
*/
if (!evsel->system_wide &&
- __perf_evlist__add_pollfd(evlist, fd, &evlist->mmap[idx], revent) < 0) {
- perf_evlist__mmap_put(evlist, idx);
+ __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) {
+ perf_mmap__put(&maps[idx]);
return -1;
}

@@ -1130,13 +1128,14 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
pr_debug2("perf event ring buffer mmapped per cpu\n");
for (cpu = 0; cpu < nr_cpus; cpu++) {
int output = -1;
+ int output_backward = -1;

auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
true);

for (thread = 0; thread < nr_threads; thread++) {
if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
- thread, &output))
+ thread, &output, &output_backward))
goto out_unmap;
}
}
@@ -1157,12 +1156,13 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
pr_debug2("perf event ring buffer mmapped per thread\n");
for (thread = 0; thread < nr_threads; thread++) {
int output = -1;
+ int output_backward = -1;

auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
false);

if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
- &output))
+ &output, &output_backward))
goto out_unmap;
}