Messages in this thread | | | From | Wang Nan <> | Subject | [PATCH v2 00/13] perf tools: Support overwritable ring buffer | Date | Fri, 20 May 2016 16:38:22 +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.
Wang Nan (13): perf tools: Add overwrite attribute to evsel and check write_backward perf tools: Record fd into perf_mmap perf tools: Add API to pause a evlist perf record: Prevent reading invalid data in record__mmap_read perf record: Rename variable to make code clear perf record: Read from backward ring buffer perf evlist: Introduce aux perf evlist perf tools: Don't poll and mmap overwritable events perf tools: Enable overwrite settings perf record: Introduce rec->overwrite_evlist for overwritable events perf record: Toggle overwrite ring buffer for reading perf tools: Don't warn about out of order event if write_backward is used perf tools: Check write_backward during evlist config
tools/perf/Documentation/perf-record.txt | 14 ++ tools/perf/arch/x86/util/tsc.c | 2 + tools/perf/builtin-record.c | 344 +++++++++++++++++++++++++++---- tools/perf/perf.h | 1 + tools/perf/util/evlist.c | 81 ++++++-- tools/perf/util/evlist.h | 6 + tools/perf/util/evsel.c | 38 +++- tools/perf/util/evsel.h | 16 ++ tools/perf/util/parse-events.c | 20 +- tools/perf/util/parse-events.h | 2 + tools/perf/util/parse-events.l | 2 + tools/perf/util/record.c | 17 ++ tools/perf/util/session.c | 22 +- 13 files changed, 497 insertions(+), 68 deletions(-)
Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: He Kuang <hekuang@huawei.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: Wang Nan <wangnan0@huawei.com> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com
-- 1.8.3.4
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