This is a note to let you know that I've just added the patch titled
perf session: Don't rely on evlist in pipe mode
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-session-don-t-rely-on-evlist-in-pipe-mode.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Mar 18 16:55:33 CET 2018
From: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
Date: Mon, 10 Apr 2017 13:14:30 -0700
Subject: perf session: Don't rely on evlist in pipe mode
From: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
[ Upstream commit 0973ad97c187e06aece61f685b9c3b2d93290a73 ]
Session sets a number parameters that rely on evlist. These parameters
are not used in pipe-mode and should not be set, since evlist is
unavailable. Fix that.
Signed-off-by: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: He Kuang <hekuang@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Paul Turner <pjt@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Simon Que <sque@xxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170410201432.24807-6-davidcc@xxxxxxxxxx
[ Check if file != NULL in perf_session__new(), like when used by builtin-top.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/util/session.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -139,8 +139,14 @@ struct perf_session *perf_session__new(s
if (perf_session__open(session) < 0)
goto out_close;
- perf_session__set_id_hdr_size(session);
- perf_session__set_comm_exec(session);
+ /*
+ * set session attributes that are present in perf.data
+ * but not in pipe-mode.
+ */
+ if (!file->is_pipe) {
+ perf_session__set_id_hdr_size(session);
+ perf_session__set_comm_exec(session);
+ }
}
} else {
session->machines.host.env = &perf_env;
@@ -155,7 +161,11 @@ struct perf_session *perf_session__new(s
pr_warning("Cannot read kernel map\n");
}
- if (tool && tool->ordering_requires_timestamps &&
+ /*
+ * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
+ * processed, so perf_evlist__sample_id_all is not meaningful here.
+ */
+ if ((!file || !file->is_pipe) && tool && tool->ordering_requires_timestamps &&
tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
tool->ordered_events = false;
Patches currently in stable-queue which might be from davidcc@xxxxxxxxxx are
queue-4.9/perf-session-don-t-rely-on-evlist-in-pipe-mode.patch
queue-4.9/perf-inject-copy-events-when-reordering-events-in-pipe-mode.patch
queue-4.9/perf-stat-fix-bug-in-handling-events-in-error-state.patch