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

From	Wang Nan <wangnan0@huawei.com>
Newsgroups	linux.kernel
Subject	[PATCH 0/6] perf core: Read from overwrite ring buffer
Date	2016-01-19 12:20 +0100
Message-ID	<qSCum-6ZJ-9@gated-at.bofh.it> (permalink)
References	<qSgNb-rq-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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@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

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

Thread

[PATCH] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan <wangnan0@huawei.com> - 2016-01-18 13:00 +0100
  Re: [PATCH] perf core: Introduce new ioctl options to pause and  resume ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-01-18 13:10 +0100
    Re: [PATCH] perf core: Introduce new ioctl options to pause and resume  ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-19 04:00 +0100
    [PATCH 0/6] perf core: Read from overwrite ring buffer Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 1/6] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 6/6] perf/core: Put size of a sample at the end of it by PERF_SAMPLE_TAILSIZE Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 2/6] perf core: Set event's default overflow_handler Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 5/6] perf core: Reduce perf event output overhead by setting overwrite handler Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 4/6] perf core: Add backwork attribute to perf event Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:20 +0100
      [PATCH 3/6] perf core: Prepare writing into ring buffer from end Wang Nan <wangnan0@huawei.com> - 2016-01-19 12:30 +0100
      Re: [PATCH 0/6] perf core: Read from overwrite ring buffer Namhyung Kim <namhyung@kernel.org> - 2016-01-19 15:10 +0100
        Re: [PATCH 0/6] perf core: Read from overwrite ring buffer pi3orama <pi3orama@163.com> - 2016-01-19 15:20 +0100
      Re: [PATCH 0/6] perf core: Read from overwrite ring buffer Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-19 18:50 +0100
        Re: [PATCH 0/6] perf core: Read from overwrite ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-20 02:40 +0100
          Re: [PATCH 0/6] perf core: Read from overwrite ring buffer Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-20 03:30 +0100
            Re: [PATCH 0/6] perf core: Read from overwrite ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-21 08:00 +0100
              Re: [PATCH 0/6] perf core: Read from overwrite ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-22 03:30 +0100
                Re: [PATCH 0/6] perf core: Read from overwrite ring buffer Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-01-22 04:30 +0100
                Re: [PATCH 0/6] perf core: Read from overwrite ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-01-22 05:50 +0100

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