linux-kernel - [PATCH 14/32] perf/x86/intel/cqm: add preallocation of anodes

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Message-Id: <1461905018-86355-15-git-send-email-davidcc@google.com>
Date:	Thu, 28 Apr 2016 21:43:20 -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 14/32] perf/x86/intel/cqm: add preallocation of anodes

Pre-allocate enough anodes to be able to at least hold one set of RMIDs
per package before running out of anodes.

Reviewed-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
---
 arch/x86/events/intel/cqm.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/events/intel/cqm.c b/arch/x86/events/intel/cqm.c
index 904f2d3..98a919f 100644
--- a/arch/x86/events/intel/cqm.c
+++ b/arch/x86/events/intel/cqm.c
@@ -194,6 +194,7 @@ static int anode_pool__alloc_one(u16 pkg_id);
 /* Init cqm pkg_data for @cpu 's package. */
 static int pkg_data_init_cpu(int cpu)
 {
+	int i, nr_anodes;
 	struct pkg_data *pkg_data;
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 	u16 pkg_id = topology_physical_package_id(cpu);
@@ -257,6 +258,15 @@ static int pkg_data_init_cpu(int cpu)
 	pkg_data->timed_update_cpu = cpu;
 
 	cqm_pkgs_data[pkg_id] = pkg_data;
+
+	/* Pre-allocate pool with one anode more than minimum needed to contain
+	 * all the RMIDs in the package.
+	 */
+	nr_anodes = (pkg_data->max_rmid + NR_RMIDS_PER_NODE) /
+		NR_RMIDS_PER_NODE + 1;
+
+	for (i = 0; i < nr_anodes; i++)
+		anode_pool__alloc_one(pkg_id);
 	return 0;
 }
 
-- 
2.8.0.rc3.226.g39d4020