lkml.org 
[lkml]   [2019]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:perf/urgent] perf trace: Fix ')' placement in "interrupted" syscall lines
Commit-ID:  172bf02d564bdb6df8410f64720fa2c68e755d1a
Gitweb: https://git.kernel.org/tip/172bf02d564bdb6df8410f64720fa2c68e755d1a
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 7 Jan 2019 16:24:27 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 8 Jan 2019 13:28:12 -0300

perf trace: Fix ')' placement in "interrupted" syscall lines

When we get the sys_enter for a syscall we check if the last one is
still waiting for its matching sys_exit, if so we print this:

468.753 ( ): firefox/32382 poll(ufds: 0x7f3988d3dd00, nfds: 7, timeout_msecs: 4294967295) ...
449.575 ( 0.004 ms): Softwar~cThrea/32434 futex(uaddr: 0x7f39a18a9b70, op: WAKE|PRIVATE_FLAG, val: 1) = 0

At some point we'll get that poll sys_exit event and will print a "[continued]" line.

While making the sizing of the alignment after the syscall arg list and
its result configurable, so that we can mimic strace, which uses a
smaller alingment by default, a bug was introduced where the closing
parens appeared before the syscall name and its arg list, fix it.

Fixes: 4b8a240ed5e0 ("perf trace: Add alignment spaces after the closing parens")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-oi45i54s59h1w1kmgpzrfuum@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index adbf28183560..b8bf5d025563 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1758,6 +1758,7 @@ static int trace__printf_interrupted_entry(struct trace *trace)
{
struct thread_trace *ttrace;
size_t printed;
+ int len;

if (trace->failure_only || trace->current == NULL)
return 0;
@@ -1768,9 +1769,14 @@ static int trace__printf_interrupted_entry(struct trace *trace)
return 0;

printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
- printed += fprintf(trace->output, ")%-*s ...\n", trace->args_alignment, ttrace->entry_str);
- ttrace->entry_pending = false;
+ printed += len = fprintf(trace->output, "%s)", ttrace->entry_str);
+
+ if (len < trace->args_alignment - 4)
+ printed += fprintf(trace->output, "%-*s", trace->args_alignment - 4 - len, " ");

+ printed += fprintf(trace->output, " ...\n");
+
+ ttrace->entry_pending = false;
++trace->nr_events_printed;

return printed;
\
 
 \ /
  Last update: 2019-01-09 08:11    [W:0.036 / U:1.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site