From: Wang Nan <wangnan0@huawei.com>
To: <peterz@infradead.org>, <ast@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, Wang Nan <wangnan0@huawei.com>,
He Kuang <hekuang@huawei.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
"Brendan Gregg" <brendan.d.gregg@gmail.com>,
Jiri Olsa <jolsa@kernel.org>,
"Masami Hiramatsu" <masami.hiramatsu.pt@hitachi.com>,
Namhyung Kim <namhyung@kernel.org>, Zefan Li <lizefan@huawei.com>,
<pi3orama@163.com>
Subject: [PATCH 2/6] perf core: Set event's default overflow_handler
Date: Tue, 19 Jan 2016 11:16:46 +0000 [thread overview]
Message-ID: <1453202210-134429-3-git-send-email-wangnan0@huawei.com> (raw)
In-Reply-To: <1453202210-134429-1-git-send-email-wangnan0@huawei.com>
Set a default event->overflow_handler in perf_event_alloc() so don't
need checking event->overflow_handler in __perf_event_overflow().
Following commits can give a different default overflow_handler.
No extra performance introduced into hot path because in the original
code we still need reading this handler from memory. A conditional branch
is avoided so actually we remove some instructions.
Initial idea comes from Peter at [1].
[1] http://lkml.kernel.org/r/20130708121557.GA17211@twins.programming.kicks-ass.net
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
kernel/events/core.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 9e9c84da..f79c4be 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6402,10 +6402,7 @@ static int __perf_event_overflow(struct perf_event *event,
irq_work_queue(&event->pending);
}
- if (event->overflow_handler)
- event->overflow_handler(event, data, regs);
- else
- perf_event_output(event, data, regs);
+ event->overflow_handler(event, data, regs);
if (*perf_event_fasync(event) && event->pending_kill) {
event->pending_wakeup = 1;
@@ -7874,8 +7871,13 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
context = parent_event->overflow_handler_context;
}
- event->overflow_handler = overflow_handler;
- event->overflow_handler_context = context;
+ if (overflow_handler) {
+ event->overflow_handler = overflow_handler;
+ event->overflow_handler_context = context;
+ } else {
+ event->overflow_handler = perf_event_output;
+ event->overflow_handler_context = NULL;
+ }
perf_event__state_init(event);
--
1.8.3.4
next prev parent reply other threads:[~2016-01-19 11:18 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-11 13:47 [PATCH 00/53] perf tools: Bugfix, BPF improvement and perf record flight record mode Wang Nan
2016-01-11 13:47 ` [PATCH 01/53] perf tools: Add -lutil in python lib list for broken python-config Wang Nan
2016-01-12 9:43 ` Jiri Olsa
2016-01-12 10:09 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:47 ` [PATCH 02/53] perf tools: Fix phony build target for build-test Wang Nan
2016-01-12 10:09 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:47 ` [PATCH 03/53] perf tools: Set parallel making options build-test Wang Nan
2016-01-11 13:47 ` [PATCH 04/53] perf tools: Pass O option to Makefile.perf in build-test Wang Nan
2016-01-11 13:47 ` [PATCH 05/53] perf tools: Test correct path of perf " Wang Nan
2016-01-11 15:24 ` Arnaldo Carvalho de Melo
2016-01-11 22:06 ` Arnaldo Carvalho de Melo
2016-01-11 22:39 ` Arnaldo Carvalho de Melo
2016-01-11 22:39 ` Arnaldo Carvalho de Melo
2016-01-12 7:16 ` Wangnan (F)
2016-01-12 14:08 ` Arnaldo Carvalho de Melo
2016-01-11 13:47 ` [PATCH 06/53] perf tools: Fix PowerPC native building Wang Nan
2016-01-12 10:10 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:47 ` [PATCH 07/53] tools: Move Makefile.arch from perf/config to tools/scripts Wang Nan
2016-01-11 13:52 ` Wangnan (F)
2016-01-11 14:10 ` Arnaldo Carvalho de Melo
2016-01-12 10:10 ` [tip:perf/urgent] tools: Move Makefile.arch from perf/ config " tip-bot for Wang Nan
2016-01-11 13:47 ` [PATCH 08/53] perf tools: Add missing sources in perf's MANIFEST Wang Nan
2016-01-11 13:48 ` [PATCH 09/53] perf: bpf: Fix build breakage due to libbpf Wang Nan
2016-01-12 10:10 ` [tip:perf/urgent] perf " tip-bot for Naveen N. Rao
2016-01-11 13:48 ` [PATCH 10/53] tools build: Add BPF feature check to test-all Wang Nan
2016-01-12 10:11 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:48 ` [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test hist' Wang Nan
2016-01-11 14:25 ` Sergei Shtylyov
2016-01-11 14:58 ` Arnaldo Carvalho de Melo
2016-01-11 15:32 ` Arnaldo Carvalho de Melo
2016-01-12 10:11 ` [tip:perf/urgent] perf test: Fix false TEST_OK result for ' perf " tip-bot for Wang Nan
2016-01-11 13:48 ` [PATCH 12/53] perf test: Reset err after using it hold errcode in hist testcases Wang Nan
2016-01-12 10:11 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:48 ` [PATCH 13/53] perf tools: Prevent calling machine__delete() on non-allocated machine Wang Nan
2016-01-11 15:42 ` Arnaldo Carvalho de Melo
2016-01-12 7:03 ` Wangnan (F)
2016-01-12 14:07 ` Arnaldo Carvalho de Melo
2016-01-11 13:48 ` [PATCH 14/53] perf test: Check environment before start real BPF test Wang Nan
2016-01-11 21:55 ` Arnaldo Carvalho de Melo
2016-01-12 7:40 ` Wangnan (F)
2016-01-12 14:10 ` Arnaldo Carvalho de Melo
2016-01-11 13:48 ` [PATCH 15/53] perf tools: Fix symbols searching for offline module in buildid-cache Wang Nan
2016-01-11 13:48 ` [PATCH 16/53] perf tools: Fix mmap2 event allocation in synthesize code Wang Nan
2016-01-11 21:03 ` Arnaldo Carvalho de Melo
2016-01-12 10:12 ` [PATCH 16/53 v2] " Wang Nan
2016-01-12 10:49 ` 平松雅巳 / HIRAMATU，MASAMI
2016-01-12 10:51 ` Wangnan (F)
2016-01-12 14:24 ` acme
2016-01-13 0:40 ` 平松雅巳 / HIRAMATU，MASAMI
2016-01-13 9:40 ` [tip:perf/urgent] " tip-bot for Wang Nan
2016-01-11 13:48 ` [PATCH 17/53] perf test: Improve bp_signal Wang Nan
2016-01-11 21:37 ` Arnaldo Carvalho de Melo
2016-01-12 4:13 ` Wangnan (F)
2016-01-12 9:21 ` Jiri Olsa
2016-01-12 14:11 ` Arnaldo Carvalho de Melo
2016-01-12 14:17 ` Will Deacon
2016-01-11 13:48 ` [PATCH 18/53] perf tools: Add API to config maps in bpf object Wang Nan
2016-01-11 13:48 ` [PATCH 19/53] perf tools: Enable BPF object configure syntax Wang Nan
2016-01-11 13:48 ` [PATCH 20/53] perf record: Apply config to BPF objects before recording Wang Nan
2016-01-11 13:48 ` [PATCH 21/53] perf tools: Enable passing event to BPF object Wang Nan
2016-01-11 13:48 ` [PATCH 22/53] perf tools: Support perf event alias name Wang Nan
2016-01-11 13:48 ` [PATCH 23/53] perf tools: Support setting different slots in a BPF map separately Wang Nan
2016-01-11 13:48 ` [PATCH 24/53] perf tools: Enable indices setting syntax for BPF maps Wang Nan
2016-01-11 13:48 ` [PATCH 25/53] perf tools: Introduce bpf-output event Wang Nan
2016-01-11 13:48 ` [PATCH 26/53] perf data: Support converting data from bpf_perf_event_output() Wang Nan
2016-01-11 13:48 ` [PATCH 27/53] perf/core: Put size of a sample at the end of it by PERF_SAMPLE_TAILSIZE Wang Nan
2016-01-11 18:09 ` Alexei Starovoitov
2016-01-12 5:33 ` Wangnan (F)
2016-01-12 6:11 ` Alexei Starovoitov
2016-01-12 12:36 ` Wangnan (F)
2016-01-12 19:56 ` Alexei Starovoitov
2016-01-13 4:34 ` Wangnan (F)
2016-01-13 5:14 ` Alexei Starovoitov
2016-01-12 14:05 ` Peter Zijlstra
2016-01-12 14:14 ` Peter Zijlstra
2016-01-18 11:52 ` [PATCH] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan
2016-01-18 12:02 ` Peter Zijlstra
2016-01-19 2:55 ` Wangnan (F)
2016-01-19 11:16 ` [PATCH 0/6] perf core: Read from overwrite " Wang Nan
2016-01-19 11:16 ` [PATCH 1/6] perf core: Introduce new ioctl options to pause and resume " Wang Nan
2016-01-19 11:16 ` Wang Nan [this message]
2016-01-19 11:16 ` [PATCH 3/6] perf core: Prepare writing into ring buffer from end Wang Nan
2016-01-19 11:16 ` [PATCH 4/6] perf core: Add backwork attribute to perf event Wang Nan
2016-01-19 11:16 ` [PATCH 5/6] perf core: Reduce perf event output overhead by setting overwrite handler Wang Nan
2016-01-19 11:16 ` [PATCH 6/6] perf/core: Put size of a sample at the end of it by PERF_SAMPLE_TAILSIZE Wang Nan
2016-01-19 13:58 ` [PATCH 0/6] perf core: Read from overwrite ring buffer Namhyung Kim
2016-01-19 14:14 ` pi3orama
2016-01-19 17:42 ` Alexei Starovoitov
2016-01-20 1:37 ` Wangnan (F)
2016-01-20 2:20 ` Alexei Starovoitov
2016-01-21 6:51 ` Wangnan (F)
2016-01-22 2:21 ` Wangnan (F)
2016-01-22 3:21 ` Alexei Starovoitov
2016-01-22 4:45 ` Wangnan (F)
2016-01-11 13:48 ` [PATCH 28/53] perf tools: Move timestamp creation to util Wang Nan
2016-01-11 13:48 ` [PATCH 29/53] perf tools: Make ordered_events reusable Wang Nan
2016-01-11 21:33 ` Arnaldo Carvalho de Melo
2016-01-11 13:48 ` [PATCH 30/53] perf record: Extract synthesize code to record__synthesize() Wang Nan
2016-01-11 13:48 ` [PATCH 31/53] perf tools: Add perf_data_file__switch() helper Wang Nan
2016-01-11 13:48 ` [PATCH 32/53] perf record: Turns auxtrace_snapshot_enable into 3 states Wang Nan
2016-01-11 13:48 ` [PATCH 33/53] perf record: Introduce record__finish_output() to finish a perf.data Wang Nan
2016-01-11 13:48 ` [PATCH 34/53] perf record: Use OPT_BOOLEAN_SET for buildid cache related options Wang Nan
2016-01-11 13:48 ` [PATCH 35/53] perf record: Add '--timestamp-filename' option to append timestamp to output filename Wang Nan
2016-01-11 13:48 ` [PATCH 36/53] perf record: Split output into multiple files via '--switch-output' Wang Nan
2016-01-11 13:48 ` [PATCH 37/53] perf record: Force enable --timestamp-filename when --switch-output is provided Wang Nan
2016-01-11 13:48 ` [PATCH 38/53] perf record: Disable buildid cache options by default in switch output mode Wang Nan
2016-01-11 13:48 ` [PATCH 39/53] perf record: Re-synthesize tracking events after output switching Wang Nan
2016-01-11 13:48 ` [PATCH 40/53] perf record: Generate tracking events for process forked by perf Wang Nan
2016-01-11 13:48 ` [PATCH 41/53] perf record: Ensure return non-zero rc when mmap fail Wang Nan
2016-01-11 13:48 ` [PATCH 42/53] perf record: Prevent reading invalid data in record__mmap_read Wang Nan
2016-01-11 14:21 ` Sergei Shtylyov
2016-01-11 15:00 ` Arnaldo Carvalho de Melo
2016-01-11 15:01 ` Arnaldo Carvalho de Melo
2016-01-11 13:48 ` [PATCH 43/53] perf tools: Add evlist channel helpers Wang Nan
2016-01-11 13:48 ` [PATCH 44/53] perf tools: Automatically add new channel according to evlist Wang Nan
2016-01-11 13:48 ` [PATCH 45/53] perf tools: Operate multiple channels Wang Nan
2016-01-11 13:48 ` [PATCH 46/53] perf tools: Squash overwrite setting into channel Wang Nan
2016-01-11 13:48 ` [PATCH 47/53] perf record: Don't read from and poll overwrite channel Wang Nan
2016-01-11 13:48 ` [PATCH 48/53] perf tools: Enable overwrite settings Wang Nan
2016-01-11 13:48 ` [PATCH 49/53] perf tools: Consider TAILSIZE bit when caclulate is_pos Wang Nan
2016-01-11 13:48 ` [PATCH 50/53] perf tools: Set tailsize attribut bit for overwrite events Wang Nan
2016-01-11 13:48 ` [PATCH 51/53] perf record: Read from tailsize ring buffer Wang Nan
2016-01-11 13:48 ` [PATCH 52/53] perf record: Toggle tailsize ring buffer for reading Wang Nan
2016-01-11 13:48 ` [PATCH 53/53] perf record: Allow generate tracking events at the end of output Wang Nan
-- strict thread matches above, loose matches on Subject: below --
2016-01-22 12:13 [PATCH 0/6] perf core: Read from overwrite ring buffer Wang Nan
2016-01-22 12:13 ` [PATCH 2/6] perf core: Set event's default overflow_handler Wang Nan
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