[RFC 0/2] perf: Fixing throttling related WARN

[Jiri Olsa <jolsa@redhat.com>]

hi,
we managed to trigger perf WARN (described in patch 2),
but only on AMD system with 48 CPUs.

I believe the reason is a race in throttling code and
I tried to fix it. So far my testing looks ok, but I
suspect I broke something else.. ;-)

thanks for comments,
jirka


Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Stephane Eranian <eranian@google.com>
---
 arch/x86/kernel/cpu/perf_event_intel.c |  4 +++-
 include/linux/perf_event.h             |  2 +-
 kernel/events/core.c                   | 67 +++++++++++++++++++++++++++++++++++++++----------------------------
 3 files changed, 43 insertions(+), 30 deletions(-)