From: Anton Blanchard <anton@samba.org>
To: fweisbec@gmail.com, mingo@elte.hu, paulus@samba.org,
a.p.zijlstra@chello.nl
Cc: linux-kernel@vger.kernel.org
Subject: perf report fractal output issue
Date: Thu, 15 Oct 2009 09:57:26 +1100 [thread overview]
Message-ID: <20091014225726.GF4808@kryten> (raw)
Hi,
I noticed a problem where I wasn't always getting callchains:
# perf report
98.47% lock1_processes [kernel] [k] .lock_kernel
0.91% lock1_processes [kernel] [k] .fput
But a flat output confirmed the data is there:
# perf report -g flat
98.47% lock1_processes [kernel] [k] .lock_kernel
98.47%
.lock_kernel
.__posix_lock_file
(nil)
.fcntl_setlk
.sys_fcntl
syscall_exit
0xfffb7d04844
.testcase
.testcase
.affinitize
.new_task
.main
0xfffb7c4933c
0xfffb7c4955c
(nil)
It looks like callchain__fprintf_graph() only prints the callchain if we
have at least one rb entry at the top. In my case all the associated
backtraces are identical so I assume we dont have to do any splitting.
Anton
next reply other threads:[~2009-10-14 23:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-14 22:57 Anton Blanchard [this message]
2009-10-15 12:28 ` perf report fractal output issue Frederic Weisbecker
2009-10-15 23:41 ` Anton Blanchard
2009-10-20 21:53 ` Frederic Weisbecker
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