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From: Daniel Speyer <dspeyer@gmail.com>
To: linux-perf-users@vger.kernel.org
Subject: What helps with stacks?
Date: Tue, 21 Apr 2015 19:54:28 +0000 (UTC)	[thread overview]
Message-ID: <loom.20150421T215002-474@post.gmane.org> (raw)

Hello all,

I'm trying to get stack traces for a bunch of events using perf record and
having trouble with them getting cut off.  I'm using --callgraph dwarf,
which helps a little, and I recompiled libc with --fno-omit-frame-pointer,
which doesn't seem to have helped at all.  Very often, the bottom of the
stack is in libc, often __epoll_wait_nocancel.  Stacks for
sched:sched_switch events seem to be worse than cycles or sched:sched_wakeup
events, but it isn't 100%.  Is there anything else I could try?

Thanks,
--Daniel Speyer

             reply	other threads:[~2015-04-21 19:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-21 19:54 Daniel Speyer [this message]
2015-04-21 20:06 ` What helps with stacks? Andi Kleen
2015-04-25 18:42   ` Daniel Speyer

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