linux-kernel - [RFC v2 PATCH 03/11] sched: define TOPOLOGY_SD

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Date:	Mon, 20 Jan 2014 12:39:40 +0000
From:	dietmar.eggemann@....com
To:	peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
	morten.rasmussen@....com, chris.redpath@....com
Cc:	linux-kernel@...r.kernel.org, dietmar.eggemann@....com
Subject: [RFC v2 PATCH 03/11] sched: define TOPOLOGY_SD_FLAGS

From: Dietmar Eggemann <dietmar.eggemann@....com>

TOPOLOGY_SD_FLAGS contains all SD flags which provide topology related
information towards the scheduler. All other SD flags describe scheduler
behavioural aspects.  The aim of TOPOLOGY_SD_FLAGS is to be able to check
that the arch only specifies topology related flags in the topology info
array.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/sched.h |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 88c85b21d633..fcf2d4317217 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1414,3 +1414,19 @@ static inline u64 irq_time_read(int cpu)
 }
 #endif /* CONFIG_64BIT */
 #endif /* CONFIG_IRQ_TIME_ACCOUNTING */
+
+/*
+ * SD_flags allowed in topology descriptions.
+ *
+ * SD_SHARE_CPUPOWER      - describes SMT topologies
+ * SD_SHARE_PKG_RESOURCES - describes shared caches
+ * SD_NUMA                - describes NUMA topologies
+ *
+ * Odd one out:
+ * SD_ASYM_PACKING        - describes SMT quirks
+ */
+#define TOPOLOGY_SD_FLAGS         \
+	(SD_SHARE_CPUPOWER |      \
+	 SD_SHARE_PKG_RESOURCES | \
+	 SD_NUMA |                \
+	 SD_ASYM_PACKING)
-- 
1.7.9.5


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