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perf callchain: Add a for_each callback style API

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Add a for_each callback style API to callchain with
sample__for_each_callchain_node().

Possibly in the future such an API can avoid the overhead of
constructing the call chain list.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Casey Chen <cachen@purestorage.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Link: https://lore.kernel.org/r/20240812224119.744968-1-irogers@google.com
[ Split from a larger patch that introduced the API and use it ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2024-08-12 15:41:19 -07:00 committed by Arnaldo Carvalho de Melo
parent b2738fda24
commit 1a9d080d19
2 changed files with 41 additions and 0 deletions
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35
tools/perf/util/callchain.c
View File

@ -1797,3 +1797,38 @@ s64 callchain_avg_cycles(struct callchain_node *cnode)
return cycles;
}
int sample__for_each_callchain_node(struct thread *thread, struct evsel *evsel,
struct perf_sample *sample, int max_stack,
callchain_iter_fn cb, void *data)
{
struct callchain_cursor *cursor = get_tls_callchain_cursor();
int ret;
if (!cursor)
return -ENOMEM;
/* Fill in the callchain. */
ret = thread__resolve_callchain(thread, cursor, evsel, sample,
/*parent=*/NULL, /*root_al=*/NULL,
max_stack);
if (ret)
return ret;
/* Switch from writing the callchain to reading it. */
callchain_cursor_commit(cursor);
while (1) {
struct callchain_cursor_node *node = callchain_cursor_current(cursor);
if (!node)
break;
ret = cb(node, data);
if (ret)
return ret;
callchain_cursor_advance(cursor);
}
return 0;
}

6
tools/perf/util/callchain.h
View File

@ -311,4 +311,10 @@ u64 callchain_total_hits(struct hists *hists);
s64 callchain_avg_cycles(struct callchain_node *cnode);
typedef int (*callchain_iter_fn)(struct callchain_cursor_node *node, void *data);
int sample__for_each_callchain_node(struct thread *thread, struct evsel *evsel,
struct perf_sample *sample, int max_stack,
callchain_iter_fn cb, void *data);
#endif /* __PERF_CALLCHAIN_H */