[tip:sched/core] sched/core: Introduce SD_ASYM_CPUCAPACITY sched_domain topology flag

[tip-bot for Morten Rasmussen]

Commit-ID:  1f6e6c7cb9bcd58abb5ee11243e0eefe6b36fc8e
Gitweb:     http://git.kernel.org/tip/1f6e6c7cb9bcd58abb5ee11243e0eefe6b36fc8e
Author:     Morten Rasmussen <morten.rasmussen@xxxxxxx>
AuthorDate: Mon, 25 Jul 2016 14:34:22 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 18 Aug 2016 11:26:53 +0200

sched/core: Introduce SD_ASYM_CPUCAPACITY sched_domain topology flag

Add a topology flag to the sched_domain hierarchy indicating the lowest
domain level where the full range of CPU capacities is represented by
the domain members for asymmetric capacity topologies (e.g. ARM
big.LITTLE).

The flag is intended to indicate that extra care should be taken when
placing tasks on CPUs and this level spans all the different types of
CPUs found in the system (no need to look further up the domain
hierarchy). This information is currently only available through
iterating through the capacities of all the CPUs at parent levels in the
sched_domain hierarchy.

  SD 2      [  0      1      2      3]  SD_ASYM_CPUCAPACITY

  SD 1      [  0      1] [   2      3]  !SD_ASYM_CPUCAPACITY

  CPU:         0      1      2      3
  capacity:  756    756   1024   1024

If the topology in the example above is duplicated to create an eight
CPU example with third sched_domain level on top (SD 3), this level
should not have the flag set (!SD_ASYM_CPUCAPACITY) as its two group
would both have all CPU capacities represented within them.

Signed-off-by: Morten Rasmussen <morten.rasmussen@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: dietmar.eggemann@xxxxxxx
Cc: freedom.tan@xxxxxxxxxxxx
Cc: keita.kobayashi.ym@xxxxxxxxxxx
Cc: mgalbraith@xxxxxxx
Cc: sgurrappadi@xxxxxxxxxx
Cc: vincent.guittot@xxxxxxxxxx
Cc: yuyang.du@xxxxxxxxx
Link: http://lkml.kernel.org/r/1469453670-2660-6-git-send-email-morten.rasmussen@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/sched.h | 1 +
 kernel/sched/core.c   | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7f64e89..d750240 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1022,6 +1022,7 @@ extern void wake_up_q(struct wake_q_head *head);
 #define SD_BALANCE_FORK		0x0008	/* Balance on fork, clone */
 #define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */
 #define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */
+#define SD_ASYM_CPUCAPACITY	0x0040  /* Groups have different max cpu capacities */
 #define SD_SHARE_CPUCAPACITY	0x0080	/* Domain members share cpu capacity */
 #define SD_SHARE_POWERDOMAIN	0x0100	/* Domain members share power domain */
 #define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1b2dd52..46bfb90 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5716,6 +5716,7 @@ static int sd_degenerate(struct sched_domain *sd)
 			 SD_BALANCE_FORK |
 			 SD_BALANCE_EXEC |
 			 SD_SHARE_CPUCAPACITY |
+			 SD_ASYM_CPUCAPACITY |
 			 SD_SHARE_PKG_RESOURCES |
 			 SD_SHARE_POWERDOMAIN)) {
 		if (sd->groups != sd->groups->next)
@@ -5746,6 +5747,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
 				SD_BALANCE_NEWIDLE |
 				SD_BALANCE_FORK |
 				SD_BALANCE_EXEC |
+				SD_ASYM_CPUCAPACITY |
 				SD_SHARE_CPUCAPACITY |
 				SD_SHARE_PKG_RESOURCES |
 				SD_PREFER_SIBLING |
@@ -6363,6 +6365,7 @@ static int sched_domains_curr_level;
  *   SD_SHARE_PKG_RESOURCES - describes shared caches
  *   SD_NUMA                - describes NUMA topologies
  *   SD_SHARE_POWERDOMAIN   - describes shared power domain
+ *   SD_ASYM_CPUCAPACITY    - describes mixed capacity topologies
  *
  * Odd one out, which beside describing the topology has a quirk also
  * prescribes the desired behaviour that goes along with it:
@@ -6374,6 +6377,7 @@ static int sched_domains_curr_level;
 	 SD_SHARE_PKG_RESOURCES |	\
 	 SD_NUMA |			\
 	 SD_ASYM_PACKING |		\
+	 SD_ASYM_CPUCAPACITY |		\
 	 SD_SHARE_POWERDOMAIN)
 
 static struct sched_domain *