linux-kernel - [PATCH 3.10 225/250] perf trace: Use the syscall raw_syscalls:sys

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Message-Id: <1496876436-32402-226-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 01:00:11 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Slaby <jslaby@...e.cz>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 225/250] perf trace: Use the syscall raw_syscalls:sys_enter timestamp

From: Arnaldo Carvalho de Melo <acme@...hat.com>

commit ecf1e2253ea79c6204f4d6a5e756e8fb4aed5a7e upstream.

Instead of the one when another syscall takes place while another is being
processed (in another CPU, but we show it serialized, so need to "interrupt"
the other), and also when finally showing the sys_enter + sys_exit + duration,
where we were showing the sample->time for the sys_exit, duh.

Before:

  # perf trace sleep 1
  <SNIP>
     0.373 (   0.001 ms): close(fd: 3                   ) = 0
  1000.626 (1000.211 ms): nanosleep(rqtp: 0x7ffd6ddddfb0) = 0
  1000.653 (   0.003 ms): close(fd: 1                   ) = 0
  1000.657 (   0.002 ms): close(fd: 2                   ) = 0
  1000.667 (   0.000 ms): exit_group(                   )
  #

After:

  # perf trace sleep 1
  <SNIP>
     0.336 (   0.001 ms): close(fd: 3                   ) = 0
     0.373 (1000.086 ms): nanosleep(rqtp: 0x7ffe303e9550) = 0
  1000.481 (   0.002 ms): close(fd: 1                   ) = 0
  1000.485 (   0.001 ms): close(fd: 2                   ) = 0
  1000.494 (   0.000 ms): exit_group(                   )
[root@...et linux]#

[js] no trace__printf_interrupted_entry in 3.12 yet

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-ecbzgmu2ni6glc6zkw8p1zmx@git.kernel.org
Fixes: 752fde44fd1c ("perf trace: Support interrupted syscalls")
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
[wt: 3.10 uses stdout instead of trace->output ;
     no trace__printf_interrupted_entry() function ]
Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/perf/builtin-trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index ab3ed4a..9f2afbd 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -330,7 +330,7 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
 
 	if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
 		if (!trace->duration_filter) {
-			trace__fprintf_entry_head(trace, thread, 1, sample->time, stdout);
+			trace__fprintf_entry_head(trace, thread, 1, ttrace->entry_time, stdout);
 			printf("%-70s\n", ttrace->entry_str);
 		}
 	} else
@@ -364,7 +364,7 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 	} else if (trace->duration_filter)
 		goto out;
 
-	trace__fprintf_entry_head(trace, thread, duration, sample->time, stdout);
+	trace__fprintf_entry_head(trace, thread, duration, ttrace->entry_time, stdout);
 
 	if (ttrace->entry_pending) {
 		printf("%-70s", ttrace->entry_str);
-- 
2.8.0.rc2.1.gbe9624a