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author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-03-22 18:10:46 -0400 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-03-23 04:22:14 -0400 |
commit | 07edf7121374609709ef1b0889f6e7b8d6a62ec1 (patch) | |
tree | ad1649c9546dc3ce23bb2f8609a7459a7ca2006e /virt/kvm/iommu.c | |
parent | 9bd7d099ab3f10dd666da399c064999bae427cd9 (diff) |
tracing/events: don't use wake up for events
Impact: fix hard-lockup with sched switch events
Some ftrace events, such as sched wakeup, can be traced
while the runqueue lock is hold. Since they are using
trace_current_buffer_unlock_commit(), they call wake_up()
which can try to grab the runqueue lock too, resulting in
a deadlock.
Now for all event, we call a new helper:
trace_nowake_buffer_unlock_commit() which do pretty the same than
trace_current_buffer_unlock_commit() except than it doesn't call
trace_wake_up().
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1237759847-21025-4-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'virt/kvm/iommu.c')
0 files changed, 0 insertions, 0 deletions