Messages in this thread | | | From | Wang Nan <> | Subject | [PATCH v12 0/8] perf tools: Support overwritable ring buffer | Date | Fri, 1 Jul 2016 02:23:43 +0000 |
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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()").
v11 -> v12: Improve 'perf test backward': skip this test on old kernel, resolve conflicts.
Arnaldo Carvalho de Melo (1): perf tests: Skip backward ring buffer on old kernel
Wang Nan (7): 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 | 228 +++++++++++++++++++++++++++++-- tools/perf/perf.h | 2 + tools/perf/tests/backward-ring-buffer.c | 89 +++++++++--- 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, 426 insertions(+), 44 deletions(-)
-- 1.8.3.4
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