| Subject | Re: [PATCH 3.14 75/76] perf/x86/intel: Use PAGE_SIZE for PEBS buffer size on Core2 | From | Jiri Slaby <> | Date | Mon, 11 Apr 2016 09:01:33 +0200 |
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On 04/10/2016, 08:37 PM, Greg Kroah-Hartman wrote: > 3.14-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Jiri Olsa <jolsa@redhat.com> > > commit 3135a66b768c5ee84c8a98b21d0330dc1c1234b4 upstream.
Where does this come from?
fatal: bad object 3135a66b768c5ee84c8a98b21d0330dc1c1234b4
The same for the later perf patch.
> Using PAGE_SIZE buffers makes the WRMSR to PERF_GLOBAL_CTRL in > intel_pmu_enable_all() mysteriously hang on Core2. As a workaround, we > don't do this. > > The hard lockup is easily triggered by running 'perf test attr' > repeatedly. Most of the time it gets stuck on sample session with > small periods. > > # perf test attr -vv > 14: struct perf_event_attr setup : > --- start --- > ... > 'PERF_TEST_ATTR=/tmp/tmpuEKz3B /usr/bin/perf record -o /tmp/tmpuEKz3B/perf.data -c 123 kill >/dev/null 2>&1' ret 1 > > Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> > Signed-off-by: Jiri Olsa <jolsa@kernel.org> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> > Reviewed-by: Andi Kleen <ak@linux.intel.com> > Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> > Cc: Jiri Olsa <jolsa@redhat.com> > Cc: Kan Liang <kan.liang@intel.com> > Cc: Linus Torvalds <torvalds@linux-foundation.org> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Stephane Eranian <eranian@google.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Vince Weaver <vincent.weaver@maine.edu> > Cc: Wang Nan <wangnan0@huawei.com> > Link: http://lkml.kernel.org/r/20160301190352.GA8355@krava.redhat.com > Signed-off-by: Ingo Molnar <mingo@kernel.org> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > arch/x86/kernel/cpu/perf_event.h | 1 + > arch/x86/kernel/cpu/perf_event_intel_ds.c | 13 +++++++++++-- > 2 files changed, 12 insertions(+), 2 deletions(-)
thanks, -- js suse labs
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