[PATCH 0/4] perf core: Support reading from overwritable ring buffer

[Wang Nan <wangnan0@huawei.com>]

Following Peter and Alexei's suggestion, this patchset:

 1. Append performance test result in commit message of patch 3/4 and 4/4;
 2. Describe history and design choice in commit message of patch 4/4;
 3. Change 'onward' to 'forward';
 4. Squash patches to make a better git log.

Wang Nan (4):
  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 backward attribute to perf event

 arch/arm/kernel/hw_breakpoint.c   |  4 +--
 arch/arm64/kernel/hw_breakpoint.c |  4 +--
 include/linux/perf_event.h        | 32 +++++++++++++++--
 include/uapi/linux/perf_event.h   |  4 ++-
 kernel/events/core.c              | 73 +++++++++++++++++++++++++++++++++------
 kernel/events/internal.h          | 11 ++++++
 kernel/events/ring_buffer.c       | 63 +++++++++++++++++++++++++++++----
 7 files changed, 167 insertions(+), 24 deletions(-)

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1.8.3.4