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Subject[PATCH 1/7] perf record: Avoid synthesizing mmap() for all processes in per-thread mode
From: Stephane Eranian <>

A bug was introduced by commit c45c6ea2e5c57960dc67e00294c2b78e9540c007.

Perf record was scanning /proc/PID to create synthetic PERF_RECOR_MMAP
entries even though it was running in per-thread mode. There was a bogus
check to select what mmaps to synthesize. We only need all processes in
system-wide mode.

Cc: David S. Miller <>
Cc: Frédéric Weisbecker <>
Cc: Ingo Molnar <>
Cc: Paul Mackerras <>
Cc: Peter Zijlstra <>
Cc: Stephane Eranian <>
LKML-Reference: <>
Signed-off-by: Stephane Eranian <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/builtin-record.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 39c7247..5efc3fc 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -714,7 +714,7 @@ static int __cmd_record(int argc, const char **argv)
if (perf_guest)
perf_session__process_machines(session, event__synthesize_guest_os);

- if (!system_wide && cpu_list)
+ if (!system_wide)
event__synthesize_thread(target_tid, process_synthesized_event,
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