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Subject[PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping
Date
This patch set is a preparation to support overwritable ring buffer.
However, even without the kernel side core patch [1] is accept this
patch set is still useful.

With this patch set, perf switches output when receiving SIGUSR2. For
example:

# perf record -a -F99 --switch-output &
[1] 26435
# kill -s SIGUSR2 26435
[ perf record: dump data: Woken up 1 times ]
# [ perf record: Dump perf.data.2016041323544373 ]
# kill -s SIGUSR2 26435
[ perf record: dump data: Woken up 1 times ]
# [ perf record: Dump perf.data.2016041323544730 ]
# fg
perf record -a -F99 --switch-output
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Dump perf.data.2016041323545019 ]
[ perf record: Captured and wrote 0.395 MB perf.data.<timestamp> ]

User can periodically generates perf trace with a simple script, then
remove most of them, only keeps scripts collected when something
unusual is detected.

After [1], perf can be totally silent before receiving SIGUSR2. Trace
is collected in kernel overwritable ring buffer, and dumpped when
SIGUSR2 is received.

[1] http://lkml.kernel.org/r/1459865478-53413-1-git-send-email-wangnan0@huawei.com

Cc: Wang Nan <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com

Wang Nan (10):
perf tools: Make ordered_events reusable
perf tools: Add perf_data_file__switch() helper
perf record: Turns auxtrace_snapshot_enable into 3 states
perf record: Add '--timestamp-filename' option to append timestamp to
output filename
perf record: Split output into multiple files via '--switch-output'
perf record: Force enable --timestamp-filename when --switch-output is
provided
perf record: Disable buildid cache options by default in switch output
mode
perf record: Re-synthesize tracking events after output switching
perf record: Generate tracking events for process forked by perf
perf core: Add backward attribute to perf event

include/linux/perf_event.h | 28 +++++-
include/uapi/linux/perf_event.h | 3 +-
kernel/events/core.c | 48 ++++++++-
kernel/events/ring_buffer.c | 16 ++-
tools/perf/builtin-record.c | 208 +++++++++++++++++++++++++++++++++++----
tools/perf/util/data.c | 41 ++++++++
tools/perf/util/data.h | 11 ++-
tools/perf/util/ordered-events.c | 9 ++
tools/perf/util/ordered-events.h | 1 +
tools/perf/util/session.c | 6 +-
10 files changed, 341 insertions(+), 30 deletions(-)

--
1.8.3.4

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