Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d2e16441 authored by Morten Rasmussen's avatar Morten Rasmussen Committed by Chris Redpath
Browse files

ANDROID: sched: Introduce SD_SHARE_CAP_STATES sched_domain flag 



cpufreq is currently keeping it a secret which cpus are sharing
clock source. The scheduler needs to know about clock domains as well
to become more energy aware. The SD_SHARE_CAP_STATES domain flag
indicates whether cpus belonging to the sched_domain share capacity
states (P-states).

There is no connection with cpufreq (yet). The flag must be set by
the arch specific topology code.

cc: Russell King <linux@arm.linux.org.uk>
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>

Signed-off-by: default avatarMorten Rasmussen <morten.rasmussen@arm.com>
Change-Id: I636b038920664ade636cc9db9285d2a87943441b
Signed-off-by: default avatarChris Redpath <chris.redpath@arm.com>
parent f9b73827

include/linux/sched/topology.h

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#define SD_PREFER_SIBLING	0x1000	/* Prefer to place tasks in a sibling domain */

#define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */

#define SD_NUMA			0x4000	/* cross-node balancing */

#define SD_SHARE_CAP_STATES	0x8000  /* Domain members share capacity state */



/*

 * Increase resolution of cpu_capacity calculations

kernel/sched/topology.c

+7 −3
Original line number Diff line number Diff line
@@ -165,7 +165,8 @@ static int sd_degenerate(struct sched_domain *sd) 
			 SD_SHARE_CPUCAPACITY |

			 SD_ASYM_CPUCAPACITY |

			 SD_SHARE_PKG_RESOURCES |

			 SD_SHARE_POWERDOMAIN)) {

			 SD_SHARE_POWERDOMAIN |

			 SD_SHARE_CAP_STATES)) {

		if (sd->groups != sd->groups->next)

			return 0;

	}
@@ -198,7 +199,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) 
				SD_SHARE_CPUCAPACITY |

				SD_SHARE_PKG_RESOURCES |

				SD_PREFER_SIBLING |

				SD_SHARE_POWERDOMAIN);

				SD_SHARE_POWERDOMAIN |

				SD_SHARE_CAP_STATES);

		if (nr_node_ids == 1)

			pflags &= ~SD_SERIALIZE;

	}
@@ -1129,6 +1131,7 @@ static int sched_domains_curr_level; 
 *   SD_NUMA                - describes NUMA topologies

 *   SD_SHARE_POWERDOMAIN   - describes shared power domain

 *   SD_ASYM_CPUCAPACITY    - describes mixed capacity topologies

 *   SD_SHARE_CAP_STATES    - describes shared capacity states

 *

 * Odd one out, which beside describing the topology has a quirk also

 * prescribes the desired behaviour that goes along with it:
@@ -1141,7 +1144,8 @@ static int sched_domains_curr_level; 
	 SD_NUMA |			\

	 SD_ASYM_PACKING |		\

	 SD_ASYM_CPUCAPACITY |		\

	 SD_SHARE_POWERDOMAIN)

	 SD_SHARE_POWERDOMAIN |		\

	 SD_SHARE_CAP_STATES)



static struct sched_domain *

sd_init(struct sched_domain_topology_level *tl,