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Subject[tip:perf/core] perf report: Make max_stack value allow for synthesized callchains
Commit-ID:  188bb5e2ce112463428994f91291e5df6fc05521
Author: Adrian Hunter <>
AuthorDate: Fri, 25 Sep 2015 16:15:46 +0300
Committer: Arnaldo Carvalho de Melo <>
CommitDate: Mon, 28 Sep 2015 17:03:20 -0300

perf report: Make max_stack value allow for synthesized callchains

perf report has an option (--max-stack) to set the maximum stack depth
when processing callchains. The option defaults to the hard-coded
maximum definition PERF_MAX_STACK_DEPTH which is 127. The intention of
the option is to allow the user to reduce the processing time by
reducing the amount of the callchain that is processed.

It is also possible, when processing instruction traces, to synthesize
callchains. Synthesized callchains do not have the kernel size
limitation and are whatever size the user requests, although validation
presently prevents the user requested a value greater that 1024. The
default value is 16.

To allow for synthesized callchains, make the max_stack value at least
the same size as the synthesized callchain size.

Signed-off-by: Adrian Hunter <>
Cc: Jiri Olsa <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/builtin-report.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index e94e5c7..37c9f51 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -809,6 +809,10 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
if (report.inverted_callchain)
callchain_param.order = ORDER_CALLER;

+ if (itrace_synth_opts.callchain &&
+ (int)itrace_synth_opts.callchain_sz > report.max_stack)
+ report.max_stack = itrace_synth_opts.callchain_sz;
if (!input_name || !strlen(input_name)) {
if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
input_name = "-";

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