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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-02-02 15:19:09 +0300
committerIngo Molnar <mingo@elte.hu>2011-02-03 14:14:43 +0300
commitfe4b04fa31a6dcf4358aa84cf81e5a7fd079469b (patch)
tree20a6db874d0db2a2f2e38e3ff77df4bdaa5f1cfe /tools/perf/util/top.c
parentb84defe6036e6dea782d41b80a4590e54f249671 (diff)
downloadlinux-fe4b04fa31a6dcf4358aa84cf81e5a7fd079469b.tar.xz
perf: Cure task_oncpu_function_call() races
Oleg reported that on architectures with __ARCH_WANT_INTERRUPTS_ON_CTXSW the IPI from task_oncpu_function_call() can land before perf_event_task_sched_in() and cause interesting situations for eg. perf_install_in_context(). This patch reworks the task_oncpu_function_call() interface to give a more usable primitive as well as rework all its users to hopefully be more obvious as well as remove the races. While looking at the code I also found a number of races against perf_event_task_sched_out() which can flip contexts between tasks so plug those too. Reported-and-reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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