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Date: Thu, 11 May 2017 16:19:43 +0300 From: Alexander Shishkin <alexander.shishkin@...ux.intel.com> To: Arnaldo Carvalho de Melo <acme@...radead.org>, adrian.hunter@...el.com Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, Alexander Shishkin <alexander.shishkin@...ux.intel.com> Subject: [PATCH] perf record: Add an option to take an AUX snapshot on exit It is sometimes useful to generate a snapshot when perf record exits; I've been using a wrapper script around the workload that would do a killall -USR2 perf when the workload exits. This patch makes it easier and also works when perf record is attached to a pre-existing task. A new snapshot option 'e' can be specified in -S to enable this behavior: root@...ewhere:~# perf record -e intel_pt// -Se sleep 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.085 MB perf.data ] Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com> --- tools/perf/Documentation/perf-record.txt | 11 ++++++++--- tools/perf/builtin-record.c | 4 ++++ tools/perf/perf.h | 1 + tools/perf/util/auxtrace.c | 10 ++++++++++ 4 files changed, 23 insertions(+), 3 deletions(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index ea3789d05e..164ffce680 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -387,9 +387,14 @@ CLOCK_BOOTTIME, CLOCK_REALTIME and CLOCK_TAI. -S:: --snapshot:: Select AUX area tracing Snapshot Mode. This option is valid only with an -AUX area tracing event. Optionally the number of bytes to capture per -snapshot can be specified. In Snapshot Mode, trace data is captured only when -signal SIGUSR2 is received. +AUX area tracing event. Optionally, certain snapshot capturing parameters +can be specified in a string that follows this option: + 'e': take one last snapshot on exit; guarantees that there is at least one + snapshot in the output file; + <size>: if the PMU supports this, specify the desired snapshot size. + +In Snapshot Mode trace data is captured only when signal SIGUSR2 is received +and on exit if the above 'e' option is given. --proc-map-timeout:: When processing pre-existing threads /proc/XXX/mmap, it may take a long time, diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 70340ff200..42d1b7aeee 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1136,6 +1136,10 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) disabled = true; } } + + if (opts->auxtrace_snapshot_on_exit) + record__read_auxtrace_snapshot(rec); + trigger_off(&auxtrace_snapshot_trigger); trigger_off(&switch_output_trigger); diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 806c216a10..b79c57485b 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -50,6 +50,7 @@ struct record_opts { bool running_time; bool full_auxtrace; bool auxtrace_snapshot_mode; + bool auxtrace_snapshot_on_exit; bool record_namespaces; bool record_switch_events; bool all_kernel; diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index 0daf63b9ee..25ad4445b0 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -564,6 +564,16 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr, if (!str) return 0; + /* PMU-agnostic options */ + switch (*str) { + case 'e': + opts->auxtrace_snapshot_on_exit = true; + str++; + break; + default: + break; + } + if (itr) return itr->parse_snapshot_options(itr, opts, str); -- 2.11.0
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