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perf record: Add an option to take an AUX snapshot on exit

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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@elsewhere:~# 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 ]

Co-developed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190806144101.62892-1-alexander.shishkin@linux.intel.com
[ Fixed up !HAVE_AUXTRACE_SUPPORT build in builtin-record.c, adding 2 missing __maybe_unused ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexander Shishkin
2019-08-06 17:41:01 +03:00
committed by Arnaldo Carvalho de Melo
parent 73e5de70dc
commit ce7b0e426e
5 changed files with 53 additions and 10 deletions
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14
tools/perf/util/auxtrace.c
View File

@@ -539,9 +539,9 @@ int auxtrace_record__snapshot_start(struct auxtrace_record *itr)
return 0;
}
int auxtrace_record__snapshot_finish(struct auxtrace_record *itr)
int auxtrace_record__snapshot_finish(struct auxtrace_record *itr, bool on_exit)
{
if (itr && itr->snapshot_finish)
if (!on_exit && itr && itr->snapshot_finish)
return itr->snapshot_finish(itr);
return 0;
}
@@ -577,6 +577,16 @@ 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
tools/perf/util/auxtrace.h
View File

@@ -499,7 +499,7 @@ int auxtrace_record__info_fill(struct auxtrace_record *itr,
size_t priv_size);
void auxtrace_record__free(struct auxtrace_record *itr);
int auxtrace_record__snapshot_start(struct auxtrace_record *itr);
int auxtrace_record__snapshot_finish(struct auxtrace_record *itr);
int auxtrace_record__snapshot_finish(struct auxtrace_record *itr, bool on_exit);
int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
struct auxtrace_mmap *mm,
unsigned char *data, u64 *head, u64 *old);