This is a note to let you know that I've just added the patch titled perf/core: Fix scheduling regression of pinned groups to the 4.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: perf-core-fix-scheduling-regression-of-pinned-groups.patch and it can be found in the queue-4.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3bda69c1c3993a2bddbae01397d12bfef6054011 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Date: Tue, 18 Jul 2017 14:08:34 +0300 Subject: perf/core: Fix scheduling regression of pinned groups From: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> commit 3bda69c1c3993a2bddbae01397d12bfef6054011 upstream. Vince Weaver reported: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates an event group containing two sampling events, set > to overflow to a signal handler (which disables and then refreshes the > event). > > On a good kernel you get the following: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 946 (perf::instructions/1000000) > fd 4 overflows: 473 (perf::instructions/2000000) > Ending counts: > Count 0: 946379875 > Count 1: 946365218 > > With the broken kernels you get: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 938 (perf::instructions/1000000) > fd 4 overflows: 318 (perf::instructions/2000000) > Ending counts: > Count 0: 946373080 > Count 1: 653373058 The root cause of the bug is that the following commit: 487f05e18a ("perf/core: Optimize event rescheduling on active contexts") erronously assumed that event's 'pinned' setting determines whether the event belongs to a pinned group or not, but in fact, it's the group leader's pinned state that matters. This was discovered by Vince in the test case described above, where two instruction counters are grouped, the group leader is pinned, but the other event is not; in the regressed case the counters were off by 33% (the difference between events' periods), but should be the same within the error margin. Fix the problem by looking at the group leader's pinning. Reported-by: Vince Weaver <vincent.weaver@xxxxxxxxx> Tested-by: Vince Weaver <vincent.weaver@xxxxxxxxx> Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Fixes: 487f05e18a ("perf/core: Optimize event rescheduling on active contexts") Link: http://lkml.kernel.org/r/87lgnmvw7h.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/events/core.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1456,6 +1456,13 @@ static enum event_type_t get_event_type( lockdep_assert_held(&ctx->lock); + /* + * It's 'group type', really, because if our group leader is + * pinned, so are we. + */ + if (event->group_leader != event) + event = event->group_leader; + event_type = event->attr.pinned ? EVENT_PINNED : EVENT_FLEXIBLE; if (!ctx->task) event_type |= EVENT_CPU; Patches currently in stable-queue which might be from alexander.shishkin@xxxxxxxxxxxxxxx are queue-4.12/perf-core-fix-scheduling-regression-of-pinned-groups.patch queue-4.12/perf-annotate-fix-broken-arrow-at-row-0-connecting-jmp-instruction-to-its-target.patch queue-4.12/revert-perf-core-drop-kernel-samples-even-though-u-is-specified.patch