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Message-ID: <1465957415-83376-2-git-send-email-wangnan0@huawei.com>
Date: Wed, 15 Jun 2016 02:23:28 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <acme@...nel.org>
CC: <pi3orama@....com>, <linux-kernel@...r.kernel.org>,
Wang Nan <wangnan0@...wei.com>, He Kuang <hekuang@...wei.com>,
Jiri Olsa <jolsa@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Zefan Li <lizefan@...wei.com>,
"Arnaldo Carvalho de Melo" <acme@...hat.com>
Subject: [PATCH v7 1/8] perf evlist: Introduce aux evlist
An auxiliary evlist is created by perf_evlist__new_aux() using an
existing evlist as its parent. An auxiliary evlist can have its own
'struct perf_mmap', but can't have any other data. User should use its
parent instead when accessing other data.
Auxiliary evlists are containers of 'struct perf_mmap'. It is introduced
to allow its parent evlist to map different events into separated mmaps.
The following commit creates an auxiliary evlist for overwritable
events, because overwritable events need a read only and backwards ring
buffer, which is different from normal events.
To achieve this goal, this patch carefully changes 'evlist' to
'evlist->parent' in all functions in the path of 'perf_evlist__mmap_ex',
except 'evlist->mmap' related operations, to make sure all evlist
modifications (like pollfd and event id hash tables) goes to original
evlist.
A 'evlist->parent' pointer is added to 'struct perf_evlist' and points to
the evlist itself for normal evlists.
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1464056944-166978-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/evlist.c | 31 +++++++++++++++++++++----------
tools/perf/util/evlist.h | 3 +++
2 files changed, 24 insertions(+), 10 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 1b918aa..e8fcb22 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -45,6 +45,7 @@ void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
fdarray__init(&evlist->pollfd, 64);
evlist->workload.pid = -1;
evlist->backward = false;
+ evlist->parent = evlist;
}
struct perf_evlist *perf_evlist__new(void)
@@ -1012,7 +1013,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
struct perf_evsel *evsel;
int revent;
- evlist__for_each(evlist, evsel) {
+ evlist__for_each(evlist->parent, evsel) {
int fd;
if (evsel->overwrite != (evlist->overwrite && evlist->backward))
@@ -1044,16 +1045,16 @@ 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, idx, revent) < 0) {
+ __perf_evlist__add_pollfd(evlist->parent, fd, idx, revent) < 0) {
perf_evlist__mmap_put(evlist, idx);
return -1;
}
if (evsel->attr.read_format & PERF_FORMAT_ID) {
- if (perf_evlist__id_add_fd(evlist, evsel, cpu, thread,
+ if (perf_evlist__id_add_fd(evlist->parent, evsel, cpu, thread,
fd) < 0)
return -1;
- perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
+ perf_evlist__set_sid_idx(evlist->parent, evsel, idx, cpu,
thread);
}
}
@@ -1094,13 +1095,13 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
struct mmap_params *mp)
{
int thread;
- int nr_threads = thread_map__nr(evlist->threads);
+ int nr_threads = thread_map__nr(evlist->parent->threads);
pr_debug2("perf event ring buffer mmapped per thread\n");
for (thread = 0; thread < nr_threads; thread++) {
int output = -1;
- auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
+ auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist->parent, thread,
false);
if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
@@ -1239,8 +1240,8 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
bool auxtrace_overwrite)
{
struct perf_evsel *evsel;
- const struct cpu_map *cpus = evlist->cpus;
- const struct thread_map *threads = evlist->threads;
+ const struct cpu_map *cpus = evlist->parent->cpus;
+ const struct thread_map *threads = evlist->parent->threads;
struct mmap_params mp = {
.prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
};
@@ -1248,7 +1249,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
return -ENOMEM;
- if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
+ if (evlist->parent->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist->parent) < 0)
return -ENOMEM;
evlist->overwrite = overwrite;
@@ -1259,7 +1260,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->mmap_len,
auxtrace_pages, auxtrace_overwrite);
- evlist__for_each(evlist, evsel) {
+ evlist__for_each(evlist->parent, evsel) {
if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
evsel->sample_id == NULL &&
perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
@@ -1916,3 +1917,13 @@ perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
return NULL;
}
+
+struct perf_evlist *perf_evlist__new_aux(struct perf_evlist *parent)
+{
+ struct perf_evlist *evlist = zalloc(sizeof(*evlist));
+
+ if (evlist != NULL)
+ perf_evlist__init(evlist, parent->cpus, parent->threads);
+ evlist->parent = parent->parent;
+ return evlist;
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 68cb136..41e65ac 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -60,6 +60,7 @@ struct perf_evlist {
struct perf_evsel *selected;
struct events_stats stats;
struct perf_env *env;
+ struct perf_evlist *parent;
};
struct perf_evsel_str_handler {
@@ -70,6 +71,8 @@ struct perf_evsel_str_handler {
struct perf_evlist *perf_evlist__new(void);
struct perf_evlist *perf_evlist__new_default(void);
struct perf_evlist *perf_evlist__new_dummy(void);
+struct perf_evlist *perf_evlist__new_aux(struct perf_evlist *);
+
void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
struct thread_map *threads);
void perf_evlist__exit(struct perf_evlist *evlist);
--
1.8.3.4
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