linux-kernel - [PATCH 0/6] perf core: Read from overwrite ring buffer

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Date:	Tue, 19 Jan 2016 11:16:44 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<peterz@...radead.org>, <ast@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>,
	He Kuang <hekuang@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Brendan Gregg" <brendan.d.gregg@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	"Masami Hiramatsu" <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, <pi3orama@....com>
Subject: [PATCH 0/6] perf core: Read from overwrite ring buffer

This patchset introduces two methods to support reading from overwrite.

 1) Tailsize: write the size of an event at the end of it
 2) Backward writing: write the ring buffer from the end of it to the
    beginning.

Patch 1/6 introduces a new ioctl operation to pause and resume ring
buffer since reading from a overwrite ring buffer is not reliable.

To reduce overhead as much as possible, force setting overflow_handler
and create specific function for backward writing and onward writing.

Cc: He Kuang <hekuang@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com

Wang Nan (6):
  perf core: Introduce new ioctl options to pause and resume ring buffer
  perf core: Set event's default overflow_handler
  perf core: Prepare writing into ring buffer from end
  perf core: Add backwork attribute to perf event
  perf core: Reduce perf event output overhead by setting overwrite
    handler
  perf/core: Put size of a sample at the end of it by
    PERF_SAMPLE_TAILSIZE

 include/linux/perf_event.h      |  39 +++++++---
 include/uapi/linux/perf_event.h |   7 +-
 kernel/events/core.c            | 155 +++++++++++++++++++++++++++++++---------
 kernel/events/internal.h        |  11 +++
 kernel/events/ring_buffer.c     |  65 ++++++++++++++---
 5 files changed, 223 insertions(+), 54 deletions(-)

-- 
1.8.3.4