linux-kernel - [PATCH v3 35/46] perf/x86/intel/cmt: use PERF_EV_CAP_CGROUP_NO_RECURSION in intel

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Date:   Sat, 29 Oct 2016 17:38:32 -0700
From:   David Carrillo-Cisneros <davidcc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     "x86@...nel.org" <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vegard Nossum <vegard.nossum@...il.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Nilay Vaish <nilayvaish@...il.com>,
        Borislav Petkov <bp@...e.de>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Paul Turner <pjt@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>
Subject: [PATCH v3 35/46] perf/x86/intel/cmt: use PERF_EV_CAP_CGROUP_NO_RECURSION in intel_cmt

Use newly added flag.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
---
 arch/x86/events/intel/cmt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/events/intel/cmt.c b/arch/x86/events/intel/cmt.c
index 614b2f4..194038b 100644
--- a/arch/x86/events/intel/cmt.c
+++ b/arch/x86/events/intel/cmt.c
@@ -1734,6 +1734,14 @@ static int intel_cmt_event_init(struct perf_event *event)
 	INIT_LIST_HEAD(&event->hw.cmt_list);
 
 	/*
+	 * CMT hw only allows one rmid per core at the time and therefore
+	 * it is not compatible with the way generic code handles cgroup
+	 * dependencies.
+	 */
+	if (event->cgrp)
+		event->event_caps |= PERF_EV_CAP_CGROUP_NO_RECURSION;
+
+	/*
 	 * Task events can be read in any CPU in any package. CPU events
 	 * only in CPU's package. Both can read even if inactive.
 	 */
-- 
2.8.0.rc3.226.g39d4020