linux-kernel - [PATCH 18/32] perf/x86/intel/cqm: use pmu::event

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Date:	Thu, 28 Apr 2016 21:43:24 -0700
From:	David Carrillo-Cisneros <davidcc@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	David Carrillo-Cisneros <davidcc@...gle.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 18/32] perf/x86/intel/cqm: use pmu::event_terminate

Utilized to detach a monr from a cgroup before the event's reference
to the cgroup is removed.

Reviewed-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
---
 arch/x86/events/intel/cqm.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/cqm.c b/arch/x86/events/intel/cqm.c
index f000fd0..dcf7f4a 100644
--- a/arch/x86/events/intel/cqm.c
+++ b/arch/x86/events/intel/cqm.c
@@ -2391,7 +2391,7 @@ static int intel_cqm_event_add(struct perf_event *event, int mode)
 	return prmid_summary__is_istate(summary) ? -1 : 0;
 }
 
-static void intel_cqm_event_destroy(struct perf_event *event)
+static void intel_cqm_event_terminate(struct perf_event *event)
 {
 	struct perf_event *group_other = NULL;
 	struct monr *monr;
@@ -2438,6 +2438,17 @@ static void intel_cqm_event_destroy(struct perf_event *event)
 	if (monr__is_root(monr))
 		goto exit;
 
+	/* Handle cgroup event. */
+	if (event->cgrp) {
+		monr->mon_event_group = NULL;
+		if ((event->cgrp->css.flags & CSS_ONLINE) &&
+		    !cgrp_to_cqm_info(event->cgrp)->cont_monitoring)
+			__css_stop_monitoring(&monr__get_mon_cgrp(monr)->css);
+
+		goto exit;
+	}
+	WARN_ON_ONCE(!monr_is_event_type(monr));
+
 	/* Transition all pmonrs to (U)state. */
 	monr_hrchy_acquire_locks(flags, i);
 
@@ -2478,8 +2489,6 @@ static int intel_cqm_event_init(struct perf_event *event)
 	INIT_LIST_HEAD(&event->hw.cqm_event_groups_entry);
 	INIT_LIST_HEAD(&event->hw.cqm_event_group_entry);
 
-	event->destroy = intel_cqm_event_destroy;
-
 	mutex_lock(&cqm_mutex);
 
 
@@ -2595,6 +2604,7 @@ static struct pmu intel_cqm_pmu = {
 	.attr_groups	     = intel_cqm_attr_groups,
 	.task_ctx_nr	     = perf_sw_context,
 	.event_init	     = intel_cqm_event_init,
+	.event_terminate     = intel_cqm_event_terminate,
 	.add		     = intel_cqm_event_add,
 	.del		     = intel_cqm_event_stop,
 	.start		     = intel_cqm_event_start,
-- 
2.8.0.rc3.226.g39d4020