perf: Allow the PMU driver to choose the CPU on which to install events

Allow the pmu->event_init callback to change event->cpu, so the PMU driver
can choose the CPU on which to install events.

Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1339741902-8449-4-git-send-email-zheng.z.yan@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 31d182e..fa36a39 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6306,7 +6306,7 @@ SYSCALL_DEFINE5(perf_event_open,
        /*
         * Get the target context (task or percpu):
         */
-       ctx = find_get_context(pmu, task, cpu);
+       ctx = find_get_context(pmu, task, event->cpu);
        if (IS_ERR(ctx)) {
                err = PTR_ERR(ctx);
                goto err_alloc;
@@ -6379,16 +6379,16 @@ SYSCALL_DEFINE5(perf_event_open,
        mutex_lock(&ctx->mutex);
 
        if (move_group) {
-               perf_install_in_context(ctx, group_leader, cpu);
+               perf_install_in_context(ctx, group_leader, event->cpu);
                get_ctx(ctx);
                list_for_each_entry(sibling, &group_leader->sibling_list,
                                    group_entry) {
-                       perf_install_in_context(ctx, sibling, cpu);
+                       perf_install_in_context(ctx, sibling, event->cpu);
                        get_ctx(ctx);
                }
        }
 
-       perf_install_in_context(ctx, event, cpu);
+       perf_install_in_context(ctx, event, event->cpu);
        ++ctx->generation;
        perf_unpin_context(ctx);
        mutex_unlock(&ctx->mutex);