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Subject[tip:perf/core] perf: Allow the PMU driver to choose the CPU on which to install events
Commit-ID:  e2d37cd213dcc0aeb3db4b37b9bd1710fe36fbf7
Gitweb: http://git.kernel.org/tip/e2d37cd213dcc0aeb3db4b37b9bd1710fe36fbf7
Author: Yan, Zheng <zheng.z.yan@intel.com>
AuthorDate: Fri, 15 Jun 2012 14:31:32 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 18 Jun 2012 12:13:21 +0200

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>
---
kernel/events/core.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 31d182e..fa36a39 100644
--- 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);

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