Commit-ID: 5a158c3ccd2183a7b0866be6685d001fe653430f Gitweb: http://git.kernel.org/tip/5a158c3ccd2183a7b0866be6685d001fe653430f Author: Yan, Zheng <zheng.z.yan@xxxxxxxxx> AuthorDate: Tue, 4 Nov 2014 21:56:02 -0500 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 18 Feb 2015 17:16:07 +0100 perf: Always switch pmu specific data during context switch If two tasks were both forked from the same parent task, Events in their perf task contexts can be the same. Perf core may leave out switching the perf event contexts. Previous patch inroduces pmu specific data. The data is for saving the LBR stack, it is task specific. So we need to switch the data even when context switch is optimized out. Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx> Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: eranian@xxxxxxxxxx Cc: jolsa@xxxxxxxxxx Link: http://lkml.kernel.org/r/1415156173-10035-7-git-send-email-kan.liang@xxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/events/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 688086b..84451c0 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2562,6 +2562,9 @@ static void perf_event_context_sched_out(struct task_struct *task, int ctxn, next->perf_event_ctxp[ctxn] = ctx; ctx->task = next; next_ctx->task = task; + + swap(ctx->task_ctx_data, next_ctx->task_ctx_data); + do_switch = 0; perf_event_sync_stat(ctx, next_ctx); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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