From: Soeren Sandmann <sandmann@daimi.au.dk>
To: linux-kernel@vger.kernel.org, mingo@elte.hu
Cc: a.p.zijlstra@chello.nl, fweisbec@gmail.com, tglx@linutronix.de,
acme@redhat.com, rosted@goodmis.org, paulus@samba.org
Subject: Hard lockup with timer events
Date: 29 Oct 2009 20:15:03 +0100 [thread overview]
Message-ID: <ye8hbtiko5k.fsf@camel23.daimi.au.dk> (raw)
Hi,
This program
http://www.daimi.au.dk/~sandmann/lockup.c
locks up hard for me on a Pentium 4 in 32 bit mode, with the hrtimer
patches applied (-tip for example).
What the program does is spawn a thread that just spins, and then 400
threads that each create a performance counter of type
PERF_COUNT_SW_CPU_CLOCK and a sample period of 1000000 and a
sample_type of
PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_CALLCHAIN
These threads then map the event buffer and read it continuously.
It does not apparently lock up if SAMPLE_CALLCHAIN is removed; also I
cannot get it to lock up on Core 2 Duo in either 32 or 64 bit mode.
Soren
next reply other threads:[~2009-10-29 19:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-29 19:15 Soeren Sandmann [this message]
2009-11-11 4:50 ` Frederic Weisbecker
2009-11-11 13:23 ` Peter Zijlstra
2009-11-11 16:34 ` Frederic Weisbecker
2009-11-11 13:48 ` Peter Zijlstra
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