perf/x86/intel: Move PMU ACK to after LBR read
authorAndi Kleen <ak@linux.intel.com>
Sun, 10 May 2015 19:22:47 +0000 (12:22 -0700)
committerIngo Molnar <mingo@kernel.org>
Tue, 4 Aug 2015 08:16:58 +0000 (10:16 +0200)
commit0f29e573dd32bb8598e74271454e97c962da5e05
tree25904b376ec79d87574bccbf8a8e0a3cf463ad44
parentd8020bee1d0caa90e7b9d6f39ac1fdfaaee7f67f
perf/x86/intel: Move PMU ACK to after LBR read

With Arch Perfmon v4 the PMU ack unfreezes the LBRs. So we need to do
the PMU ack after the LBR reading, otherwise the LBRs would be polluted
by the PMI handler.

This is a minimal change. In principle the ACK could be moved much later.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1431285767-27027-10-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/cpu/perf_event_intel.c