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authorMike Galbraith <efault@gmx.de>2010-03-26 11:11:33 +0100
committerIngo Molnar <mingo@elte.hu>2010-04-02 19:30:05 +0200
commit8bb39f9aa068262732fe44b965d7a6eb5a5a7d67 (patch)
tree820af25532c62179f518bda83ea27b6b21ee736b /Documentation
parent257ef9d21f1b008a6c7425544b36641c4325a922 (diff)
downloadlinux-8bb39f9aa068262732fe44b965d7a6eb5a5a7d67.tar.bz2
perf: Fix 'perf sched record' deadlock
perf sched record can deadlock a box should the holder of handle->data->lock take an interrupt, and then attempt to acquire an rq lock held by a CPU trying to acquire the same lock. Disable interrupts. CPU0 CPU1 sched event with rq->lock held grab handle->data->lock spin on handle->data->lock interrupt try to grab rq->lock Reported-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Mike Galbraith <efault@gmx.de> Tested-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1269598293.6174.8.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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