From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Michael Petlan <mpetlan@redhat.com>
Subject: [PATCH 22/36] libperf: Centralize map refcnt setting
Date: Mon, 7 Oct 2019 14:53:30 +0200 [thread overview]
Message-ID: <20191007125344.14268-23-jolsa@kernel.org> (raw)
In-Reply-To: <20191007125344.14268-1-jolsa@kernel.org>
Currently when new map is mmaps we set its refcnt
to 2 in perf_evlist_mmap_ops::mmap callback.
Every mmap is given refcnt set to 2 when it's first mmaped:
- 1 for current user, which will be taken out by call to
perf_evlist__munmap_filtered, where we find out there's
no more data comming from kernel to this mmap
- 1 for drain code where in perf_mmap__consume the mmap
is released if it is empty
Moving this common setup into libperf generic code
before mmap callback is called.
Link: http://lkml.kernel.org/n/tip-3us74tjjz258bgk2pavjaq59@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/lib/evlist.c | 30 +++++++++++++++---------------
tools/perf/util/mmap.c | 15 ---------------
2 files changed, 15 insertions(+), 30 deletions(-)
diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index b69722627779..f9a802d2ceb5 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -362,21 +362,6 @@ static int
perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp,
int output, int cpu)
{
- /*
- * The last one will be done at perf_mmap__consume(), so that we
- * make sure we don't prevent tools from consuming every last event in
- * the ring buffer.
- *
- * I.e. we can get the POLLHUP meaning that the fd doesn't exist
- * anymore, but the last events for it are still in the ring buffer,
- * waiting to be consumed.
- *
- * Tools can chose to ignore this at their own discretion, but the
- * evlist layer can't just drop it when filtering events in
- * perf_evlist__filter_pollfd().
- */
- refcount_set(&map->refcnt, 2);
-
return perf_mmap__mmap(map, mp, output, cpu);
}
@@ -418,6 +403,21 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
if (*output == -1) {
*output = fd;
+ /*
+ * The last one will be done at perf_mmap__consume(), so that we
+ * make sure we don't prevent tools from consuming every last event in
+ * the ring buffer.
+ *
+ * I.e. we can get the POLLHUP meaning that the fd doesn't exist
+ * anymore, but the last events for it are still in the ring buffer,
+ * waiting to be consumed.
+ *
+ * Tools can chose to ignore this at their own discretion, but the
+ * evlist layer can't just drop it when filtering events in
+ * perf_evlist__filter_pollfd().
+ */
+ refcount_set(&map->refcnt, 2);
+
if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
return -1;
} else {
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 2a8bf0ab861c..063d1b93c53d 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -243,21 +243,6 @@ static void perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params
int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
{
- /*
- * The last one will be done at perf_mmap__consume(), so that we
- * make sure we don't prevent tools from consuming every last event in
- * the ring buffer.
- *
- * I.e. we can get the POLLHUP meaning that the fd doesn't exist
- * anymore, but the last events for it are still in the ring buffer,
- * waiting to be consumed.
- *
- * Tools can chose to ignore this at their own discretion, but the
- * evlist layer can't just drop it when filtering events in
- * perf_evlist__filter_pollfd().
- */
- refcount_set(&map->core.refcnt, 2);
-
if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) {
pr_debug2("failed to mmap perf event ring buffer, error %d\n",
errno);
--
2.21.0
next prev parent reply other threads:[~2019-10-07 12:54 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 12:53 [PATCHv2 00/36] libperf: Add sampling interface Jiri Olsa
2019-10-07 12:53 ` [PATCH 01/36] libperf: Add perf_mmap__init() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 02/36] libperf: Add 'struct perf_mmap_param' Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 03/36] libperf: Add perf_mmap__mmap_len() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__mmap_len() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 04/36] libperf: Add perf_mmap__mmap() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__mmap() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 05/36] libperf: Add perf_mmap__get() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__get() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 06/36] libperf: Add perf_mmap__unmap() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__unmap() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 07/36] libperf: Add perf_mmap__put() function Jiri Olsa
2019-10-10 13:11 ` Arnaldo Carvalho de Melo
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__put() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 08/36] perf tools: Use perf_mmap way to detect aux mmap Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 09/36] libperf: Add perf_mmap__consume() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__consume() function from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 10/36] libperf: Add perf_mmap__read_init() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__read_init() from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 11/36] libperf: Add perf_mmap__read_done() function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__read_done() from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 12/36] libperf: Add perf_mmap__read_event() function Jiri Olsa
2019-10-10 14:47 ` Arnaldo Carvalho de Melo
2019-10-10 15:32 ` Jiri Olsa
2019-10-10 16:07 ` Arnaldo Carvalho de Melo
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_mmap__read_event() from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 13/36] libperf: Add perf_evlist__mmap()/munmap() functions Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_evlist__mmap()/munmap() from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 14/36] libperf: Add perf_evlist__mmap_ops function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Introduce perf_evlist__mmap_ops() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 15/36] libperf: Add perf_evlist_mmap_ops::idx callback Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Introduce " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 16/36] libperf: Add perf_evlist_mmap_ops::get callback Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 17/36] libperf: Add perf_evlist_mmap_ops::mmap callback Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Introduce " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 18/36] perf tools: Add perf_evlist__mmap_cb_idx function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] perf tools: Introduce perf_evlist__mmap_cb_idx() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 19/36] perf tools: Add perf_evlist__mmap_cb_get function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] perf evlist: Introduce perf_evlist__mmap_cb_get() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 20/36] perf tools: Add perf_evlist__mmap_cb_mmap function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] perf evlist: Introduce perf_evlist__mmap_cb_mmap() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 21/36] perf tools: Switch to libperf mmap interface Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] perf evlist: Switch to libperf's " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` Jiri Olsa [this message]
2019-10-15 5:31 ` [tip: perf/core] libperf: Centralize map refcnt setting tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 23/36] libperf: Move pollfd allocation to libperf Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Move the pollfd allocation from tools/perf " tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 24/36] libperf: Add perf_evlist__exit function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Introduce perf_evlist__exit() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 25/36] libperf: Add perf_evlist__purge function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Introduce perf_evlist__purge() tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 26/36] libperf: Add perf_evlist__filter_pollfd function Jiri Olsa
2019-10-15 5:31 ` [tip: perf/core] libperf: Adopt perf_evlist__filter_pollfd() from tools/perf tip-bot2 for Jiri Olsa
2019-10-07 12:53 ` [PATCH 27/36] libperf: Add perf_evlist__for_each_mmap function Jiri Olsa
2019-10-10 16:06 ` Arnaldo Carvalho de Melo
2019-10-10 16:20 ` Jiri Olsa
2019-10-07 12:53 ` [PATCH 28/36] libperf: Move mmap allocation to perf_evlist__mmap_ops::get Jiri Olsa
2019-10-07 12:53 ` [PATCH 29/36] libperf: Move mask setup to perf_evlist__mmap_ops function Jiri Olsa
2019-10-07 12:53 ` [PATCH 30/36] libperf: Link static tests with libapi.a Jiri Olsa
2019-10-07 12:53 ` [PATCH 31/36] libperf: Add _GNU_SOURCE define to compilation Jiri Olsa
2019-10-07 12:53 ` [PATCH 32/36] libperf: Add tests_mmap_thread test Jiri Olsa
2019-10-07 12:53 ` [PATCH 33/36] libperf: Add tests_mmap_cpus test Jiri Olsa
2019-10-07 12:53 ` [PATCH 34/36] libperf: Keep count of failed tests Jiri Olsa
2019-10-07 12:53 ` [PATCH 35/36] libperf: Do not export perf_evsel__init/perf_evlist__init Jiri Olsa
2019-10-07 12:53 ` [PATCH 36/36] libperf: Add pr_err macro Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191007125344.14268-23-jolsa@kernel.org \
--to=jolsa@kernel.org \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=mpetlan@redhat.com \
--cc=namhyung@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).