Commit-ID: 94f438c84e850570f28dd36588a0d7f73b991e44 Gitweb: http://git.kernel.org/tip/94f438c84e850570f28dd36588a0d7f73b991e44 Author: Peter Zijlstra <[email protected]> AuthorDate: Mon, 15 Aug 2016 12:54:59 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 18 Aug 2016 11:26:52 +0200
sched/core: Clarify SD_flags comment The SD_flags comment is very terse and doesn't explain why PACKING is odd. IIRC the distinction is that the 'normal' ones only describe topology, while the ASYM_PACKING one also prescribes behaviour. It is odd in the way that it doesn't only describe things. Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Morten Rasmussen <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- kernel/sched/core.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3b6b23c..54fff81 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6355,13 +6355,19 @@ static int sched_domains_curr_level; /* * SD_flags allowed in topology descriptions. * - * SD_SHARE_CPUCAPACITY - describes SMT topologies - * SD_SHARE_PKG_RESOURCES - describes shared caches - * SD_NUMA - describes NUMA topologies - * SD_SHARE_POWERDOMAIN - describes shared power domain + * These flags are purely descriptive of the topology and do not prescribe + * behaviour. Behaviour is artificial and mapped in the below sd_init() + * function: * - * Odd one out: - * SD_ASYM_PACKING - describes SMT quirks + * SD_SHARE_CPUCAPACITY - describes SMT topologies + * SD_SHARE_PKG_RESOURCES - describes shared caches + * SD_NUMA - describes NUMA topologies + * SD_SHARE_POWERDOMAIN - describes shared power domain + * + * Odd one out, which beside describing the topology has a quirk also + * prescribes the desired behaviour that goes along with it: + * + * SD_ASYM_PACKING - describes SMT quirks */ #define TOPOLOGY_SD_FLAGS \ (SD_SHARE_CPUCAPACITY | \
