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Subject[tip:perf/urgent] perf c2c: Change the default coalesce setup
Commit-ID:  423701a0c8d754d9a39547f6c48904347e4f1eca
Author: Jiri Olsa <>
AuthorDate: Fri, 28 Dec 2018 11:18:19 +0100
Committer: Arnaldo Carvalho de Melo <>
CommitDate: Fri, 28 Dec 2018 16:33:06 -0300

perf c2c: Change the default coalesce setup

Joe suggested to have the coalesce default set just to 'iaddr', because
it's easier to read on the default 'perf c2c report' output.

By removing the "pid" field from the default -c/--coalesce option, the
'perf c2c' report will group all the relevant PIDs under the instruction
address ('iaddr') bucket. User can always run "-c pid,iaddr" for a more
fine grained output on particular PIDs.

Suggested-by: Joe Mario <>
Signed-off-by: Jiri Olsa <>
Cc: Alexander Shishkin <>
Cc: Namhyung Kim <>
Cc: Peter Zijlstra <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/builtin-c2c.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index f3aa9d02a5ab..964f3f5ef420 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -68,7 +68,7 @@ struct c2c_hist_entry {
struct hist_entry he;

-static char const *coalesce_default = "pid,iaddr";
+static char const *coalesce_default = "iaddr";

struct perf_c2c {
struct perf_tool tool;
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