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perf inject: Lazily allocate event_copy

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The event_copy is 64kb (PERF_SAMPLE_SIZE_MAX) and stack allocated in
struct perf_inject. It is used for aux events that may not exist in a
file. Make the array allocation lazy to cut down on the stack usage.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230527034324.2597593-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-05-26 20:43:21 -07:00 committed by Arnaldo Carvalho de Melo
parent e590e46b54
commit d3944f0ed4
1 changed files with 13 additions and 3 deletions
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16
tools/perf/builtin-inject.c
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@ -122,7 +122,7 @@ struct perf_inject {
u64 aux_id;
struct list_head samples;
struct itrace_synth_opts itrace_synth_opts;
char event_copy[PERF_SAMPLE_MAX_SIZE];
char *event_copy;
struct perf_file_section secs[HEADER_FEAT_BITS];
struct guest_session guest_session;
struct strlist *known_build_ids;
@ -320,8 +320,14 @@ perf_inject__cut_auxtrace_sample(struct perf_inject *inject,
{
size_t sz1 = sample->aux_sample.data - (void *)event;
size_t sz2 = event->header.size - sample->aux_sample.size - sz1;
union perf_event *ev = (union perf_event *)inject->event_copy;
union perf_event *ev;
if (inject->event_copy == NULL) {
inject->event_copy = malloc(PERF_SAMPLE_MAX_SIZE);
if (!inject->event_copy)
return ERR_PTR(-ENOMEM);
}
ev = (union perf_event *)inject->event_copy;
if (sz1 > event->header.size || sz2 > event->header.size ||
sz1 + sz2 > event->header.size ||
sz1 < sizeof(struct perf_event_header) + sizeof(u64))
@ -357,8 +363,11 @@ static int perf_event__repipe_sample(struct perf_tool *tool,
build_id__mark_dso_hit(tool, event, sample, evsel, machine);
if (inject->itrace_synth_opts.set && sample->aux_sample.size)
if (inject->itrace_synth_opts.set && sample->aux_sample.size) {
event = perf_inject__cut_auxtrace_sample(inject, event, sample);
if (IS_ERR(event))
return PTR_ERR(event);
}
return perf_event__repipe_synth(tool, event);
}
@ -2391,5 +2400,6 @@ out_close_output:
if (!inject.in_place_update)
perf_data__close(&inject.output);
free(inject.itrace_synth_opts.vm_tm_corr_args);
free(inject.event_copy);
return ret;
}