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authorPeter Zijlstra <peterz@infradead.org>2015-01-23 13:19:48 +0300
committerIngo Molnar <mingo@kernel.org>2015-01-28 15:17:35 +0300
commitc3c87e770458aa004bd7ed3f29945ff436fd6511 (patch)
tree79074706175f54d333daf61cc0794aa9d76b1909 /include
parentef454caeb740ee4e1b89aeb7f7692d5ddffb6830 (diff)
downloadlinux-c3c87e770458aa004bd7ed3f29945ff436fd6511.tar.xz
perf: Tighten (and fix) the grouping condition
The fix from 9fc81d87420d ("perf: Fix events installation during moving group") was incomplete in that it failed to recognise that creating a group with events for different CPUs is semantically broken -- they cannot be co-scheduled. Furthermore, it leads to real breakage where, when we create an event for CPU Y and then migrate it to form a group on CPU X, the code gets confused where the counter is programmed -- triggered in practice as well by me via the perf fuzzer. Fix this by tightening the rules for creating groups. Only allow grouping of counters that can be co-scheduled in the same context. This means for the same task and/or the same cpu. Fixes: 9fc81d87420d ("perf: Fix events installation during moving group") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20150123125834.090683288@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/perf_event.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 4f7a61ca4b39..664de5a4ec46 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -450,11 +450,6 @@ struct perf_event {
#endif /* CONFIG_PERF_EVENTS */
};
-enum perf_event_context_type {
- task_context,
- cpu_context,
-};
-
/**
* struct perf_event_context - event context structure
*
@@ -462,7 +457,6 @@ enum perf_event_context_type {
*/
struct perf_event_context {
struct pmu *pmu;
- enum perf_event_context_type type;
/*
* Protect the states of the events in the list,
* nr_active, and the list: