Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1201115

[PATCH 11/12] perf trace: Write to stderr by default

Show all headers | View raw

From: Milian Wolff <milian.wolff@kdab.com>

Without this patch, it is cumbersome to read the trace output but
ignoring the normal, potentially verbose, output of the debuggee.  One
common example is doing something like the following:

 perf trace -s find /tmp > /dev/null

Without this patch, the trace summary will be lost. Now, it will still
be printed at the end. This behavior is also applied by strace.

Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/n/tip-tqnks6y2cnvm5f9g2dsfr7zl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 98d423efdaa9..a47497011c93 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2965,7 +2965,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 			.mmap_pages    = UINT_MAX,
 			.proc_map_timeout  = 500,
 		},
-		.output = stdout,
+		.output = stderr,
 		.show_comm = true,
 		.trace_syscalls = true,
 	};
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[GIT PULL 00/12] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 05/12] perf trace: Deref sys_enter pointer args with contents from probe:vfs_getname Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 10/12] perf tools: Do not include escape sequences in color_vfprintf return Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 01/12] perf script: No tracepoints? Don't call libtraceevent. Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 06/12] perf trace: Use vfs_getname syscall arg beautifier in more syscalls Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 12/12] perf tools: Fix build errors with mipsel-linux-uclibc compiler Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 11/12] perf trace: Write to stderr by default Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 02/12] perf trace: Do not show syscall tracepoint filter in the --no-syscalls case Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 03/12] perf trace: Remember if the vfs_getname tracepoint/kprobe is in place Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 09/12] perf tools: Remove trail argument to color vsprintf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 07/12] perf tools: Per-event time support Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200
  [PATCH 08/12] perf tools: Refine parse/config callchain functions Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-08-05 22:20 +0200

csiph-web