[RESEND PATCH 0/5] perf core: Support overwrite ring buffer

Wang Nan
2016-03-07T03:57:18Z

This patch set has been posted multiple times (with and without
corresponding 'perf tool' patches), and doesn't receive further
comment. I think it should be okay to merge them into mainline.
There are many perf's improvement depend on it. However, Peter
is not responsive after I fixed some problems he pointed out.

Introduces 'write_backward' into perf_event_attr, allows kernel
writing the ring buffer from the end of it. This feature allows
extracting data from overwritable ring buffer.

Wang Nan (5):
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
perf core: Reduce perf event output overhead by new overflow handler

include/linux/perf_event.h | 22 +++++++++++--
include/uapi/linux/perf_event.h | 4 ++-
kernel/events/core.c | 73 +++++++++++++++++++++++++++++++++++------
kernel/events/internal.h | 11 +++++++
kernel/events/ring_buffer.c | 63 +++++++++++++++++++++++++++++++----
5 files changed, 153 insertions(+), 20 deletions(-)

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: Ingo Molnar <mingo@redhat.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

--
1.8.3.4