[PATCH v11 00/10] perf tools: Support overwritable ring buffer

From	Wang Nan <wangnan0@huawei.com>
Newsgroups	linux.kernel
Subject	[PATCH v11 00/10] perf tools: Support overwritable ring buffer
Date	2016-06-27 12:30 +0200
Message-ID	<rOBXI-7pb-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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This patch set enables daemonized perf recording by utilizing
overwritable backward ring buffer. With this feature one can
put perf background, and dump ring buffer records by a SIGUSR2
when he/she find something unusual. For example, following
command record system calls, schedule events and samples on cpu cycles
continously:

 # perf record -g -e cycles -e raw_syscalls:*/call-graph=no/ \
                  -e sched:sched_switch/call-graph=no/ \
                  --switch-output --overwrite -a

Then by sending SIGUSR2 to perf when lagging is happen, we get multiple
perf.data output, each of them correspond a abnormal event, and the data
size is reasonable:

 # ls -l ./perf.data*
 -rw------- 1 root root 5122165 May 13 23:51 ./perf.data.2016051323511683
 -rw------- 1 root root 5135093 May 13 23:51 ./perf.data.2016051323512107
 -rw------- 1 root root 5135213 May 13 23:51 ./perf.data.2016051323512215
 -rw------- 1 root root 5135157 May 13 23:51 ./perf.data.2016051323512387

v1 -> v2: Totally redesign: drop the principle of 'channal', use
          auxiliary evlist instead. Fix missing documentation.

v2 -> v3: Rename perf_evlist__toggle_paused() to perf_evlist__pause/resume.

v3 -> v4: Update commit message to describe auxiliary evlist more clearly.

v4 -> v5: Reorder commits, ensure '--overwrite' works right after perf
          support the option.
          Add test cases for auxiliary evlist.
          Avoid bug if main evlist is empty.

v5 -> v6: Improve filter pollfd related code.

v6 -> v7: Rebase to newest perf/core.

v7 -> v8: Unmap mmaps from parent and children in
          perf_evlist__munmap_filtered(), hide more detail of aux evlist.
          Add --tail-synthesize, do synthesize at the end of perf.data.

v8 -> v9: Beautify code of test case, make patch set more granular,
          improve documentation.

v9 -> v10: Make patch set more granular: extract preparation code to
           patch 1-3.

v10 -> v11: Rebase to newest perf/core: solve conflicts caused by commit
            e5cadb93d08 ("perf evlist: Rename for_each() macros to
            for_each_entry()").

Wang Nan (10):
  perf record: Prepare mmap multiple evlists
  perf record: Prepare reading from multiple evlists in
    record__mmap_read_all()
  perf record: Prepare picking perf_event_mmap_page from multiple
    evlists
  perf evlist: Introduce aux evlist
  perf tests: Add testcase for auxiliary evlist
  perf record: Introduce rec->overwrite_evlist for overwritable events
  perf record: Read from overwritable ring buffer
  perf tools: Enable overwrite settings
  perf tools: Don't warn about out of order event if write_backward is
    used
  perf tools: Add --tail-synthesize option

 tools/perf/Documentation/perf-record.txt |  22 +++
 tools/perf/builtin-record.c              | 325 +++++++++++++++++++++++++++----
 tools/perf/perf.h                        |   2 +
 tools/perf/tests/backward-ring-buffer.c  |  96 +++++++--
 tools/perf/util/evlist.c                 |  49 +++--
 tools/perf/util/evlist.h                 |  20 ++
 tools/perf/util/evsel.c                  |  12 ++
 tools/perf/util/evsel.h                  |   2 +
 tools/perf/util/parse-events.c           |  20 +-
 tools/perf/util/parse-events.h           |   2 +
 tools/perf/util/parse-events.l           |   2 +
 tools/perf/util/session.c                |  22 ++-
 12 files changed, 502 insertions(+), 72 deletions(-)

-- 
1.8.3.4

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[PATCH v11 00/10] perf tools: Support overwritable ring buffer Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 05/10] perf tests: Add testcase for auxiliary evlist Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 06/10] perf record: Introduce rec->overwrite_evlist for overwritable events Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 08/10] perf tools: Enable overwrite settings Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 09/10] perf tools: Don't warn about out of order event if write_backward is used Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 04/10] perf evlist: Introduce aux evlist Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
  [PATCH v11 01/10] perf record: Prepare mmap multiple evlists Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
    Re: [PATCH v11 01/10] perf record: Prepare mmap multiple evlists Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-27 19:50 +0200
    [tip:perf/core] perf record: Move mmap setup block to separate  function tip-bot for Wang Nan <tipbot@zytor.com> - 2016-06-29 11:50 +0200
  [PATCH v11 03/10] perf record: Prepare picking perf_event_mmap_page from multiple evlists Wang Nan <wangnan0@huawei.com> - 2016-06-27 12:30 +0200
    [tip:perf/core] perf record: Prepare picking perf_event_mmap_page  from multiple evlists tip-bot for Wang Nan <tipbot@zytor.com> - 2016-06-29 11:50 +0200

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