linux-kernel - [PATCH 16/25] perf hists: Allow for max_stack greater than PERF_MAX_STACK

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Date:	Fri, 25 Sep 2015 16:15:47 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 16/25] perf hists: Allow for max_stack greater than PERF_MAX_STACK_DEPTH

Use the max_stack value instead of PERF_MAX_STACK_DEPTH so that
arbitrary-sized callchains can be supported.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/hist.c | 6 ++++--
 tools/perf/util/hist.h | 1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index b3567a25f0c4..0cad9e07c5b4 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -695,7 +695,7 @@ iter_finish_normal_entry(struct hist_entry_iter *iter,
 }
 
 static int
-iter_prepare_cumulative_entry(struct hist_entry_iter *iter __maybe_unused,
+iter_prepare_cumulative_entry(struct hist_entry_iter *iter,
 			      struct addr_location *al __maybe_unused)
 {
 	struct hist_entry **he_cache;
@@ -707,7 +707,7 @@ iter_prepare_cumulative_entry(struct hist_entry_iter *iter __maybe_unused,
 	 * cumulated only one time to prevent entries more than 100%
 	 * overhead.
 	 */
-	he_cache = malloc(sizeof(*he_cache) * (PERF_MAX_STACK_DEPTH + 1));
+	he_cache = malloc(sizeof(*he_cache) * (iter->max_stack + 1));
 	if (he_cache == NULL)
 		return -ENOMEM;
 
@@ -868,6 +868,8 @@ int hist_entry_iter__add(struct hist_entry_iter *iter, struct addr_location *al,
 	if (err)
 		return err;
 
+	iter->max_stack = max_stack_depth;
+
 	err = iter->ops->prepare_entry(iter, al);
 	if (err)
 		goto out;
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 4d6aa1dbdaee..8c20a8f6b214 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -90,6 +90,7 @@ struct hist_entry_iter {
 	int curr;
 
 	bool hide_unresolved;
+	int max_stack;
 
 	struct perf_evsel *evsel;
 	struct perf_sample *sample;
-- 
1.9.1

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