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Re: [PATCH 1/4 fix] perf core: Introduce new ioctl options to pause and resume ring buffer

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On Tue, Mar 29, 2016 at 02:05:07AM +0000, Wang Nan wrote:
> Add new ioctl() to pause/resume ring-buffer output.
> 
> In some situations we want to read from ring buffer only when we
> ensure nothing can write to the ring buffer during reading. Without
> this patch we have to turn off all events attached to this ring buffer
> to achieve this.
> 
> This patch is for supporting overwrite ring buffer. Following
> commits will introduce new methods support reading from overwrite ring
> buffer. Before reading, caller must ensure the ring buffer is frozen, or
> the reading is unreliable.
> 
> 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
> ---
>  include/uapi/linux/perf_event.h |  1 +
>  kernel/events/core.c            | 13 +++++++++++++
>  kernel/events/internal.h        | 11 +++++++++++
>  kernel/events/ring_buffer.c     |  7 ++++++-
>  4 files changed, 31 insertions(+), 1 deletion(-)

Acked-by: Alexei Starovoitov <ast@kernel.org>

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[PATCH 0/4] perf core: Support reading from overwritable ring buffer Wang Nan <wangnan0@huawei.com> - 2016-03-28 08:50 +0200
  [PATCH 1/4] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan <wangnan0@huawei.com> - 2016-03-28 08:50 +0200
    [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT Wang Nan <wangnan0@huawei.com> - 2016-03-28 12:20 +0200
    Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-03-29 02:30 +0200
      Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-03-29 03:20 +0200
      [PATCH 1/4 fix] perf core: Introduce new ioctl options to pause and resume ring buffer Wang Nan <wangnan0@huawei.com> - 2016-03-29 04:10 +0200
        Re: [PATCH 1/4 fix] perf core: Introduce new ioctl options to pause  and resume ring buffer Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2016-03-29 06:50 +0200
    Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-29 15:00 +0200
      Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-29 15:00 +0200
      Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer "Wangnan (F)" <wangnan0@huawei.com> - 2016-03-30 04:00 +0200
        Re: [PATCH 1/4] perf core: Introduce new ioctl options to pause and  resume ring buffer Peter Zijlstra <peterz@infradead.org> - 2016-03-30 08:50 +0200
    [tip:perf/core] perf/ring_buffer: Introduce new ioctl options to  pause and resume the ring-buffer tip-bot for Wang Nan <tipbot@zytor.com> - 2016-03-31 11:30 +0200
  [PATCH 2/4] perf core: Set event's default overflow_handler Wang Nan <wangnan0@huawei.com> - 2016-03-28 08:50 +0200
    [tip:perf/core] perf/core: Set event's default ::overflow_handler() tip-bot for Wang Nan <tipbot@zytor.com> - 2016-03-31 11:30 +0200

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