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Message-ID: <1466419645-75551-1-git-send-email-wangnan0@huawei.com>
Date: Mon, 20 Jun 2016 10:47:17 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <acme@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <pi3orama@....com>,
Wang Nan <wangnan0@...wei.com>
Subject: [PATCH v8 0/8] perf tools: Support overwritable ring buffer
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.
Wang Nan (8):
perf tools: Fix write_backwards fallback
perf evlist: Introduce aux evlist
perf tests: Add testcase for auxiliary evlist
perf record: Introduce rec->overwrite_evlist for overwritable events
perf record: Toggle overwrite ring buffer for reading
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 | 310 +++++++++++++++++++++++++++----
tools/perf/perf.h | 2 +
tools/perf/tests/backward-ring-buffer.c | 86 +++++++--
tools/perf/util/evlist.c | 49 +++--
tools/perf/util/evlist.h | 12 ++
tools/perf/util/evsel.c | 35 ++--
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, 476 insertions(+), 88 deletions(-)
--
1.8.3.4
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