Messages in this thread Patch in this message | | | From | Vaidyanathan Srinivasan <> | Subject | [RFC PATCH v1 2/3] sched: threshold helper functions | Date | Mon, 27 Apr 2009 02:16:57 +0530 |
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Define group capacity threshold as a multiple of impalance percentage at higher levels of sched_mc settings.
sched_mc=3 Group capacity increased by 25% (5 tasks on quad core) sched_mc=4 Group capacity increased by 50% (6 tasks on quad core) sched_mc=5 Group capacity increased by 100% (8 tasks on quad core)
*** RFC patch for discussion ***
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> ---
kernel/sched.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index b902e58..f88ed04 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3291,6 +3291,21 @@ static inline int get_sd_load_idx(struct sched_domain *sd, #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT) + +static inline unsigned int group_capacity_bump_pct(struct sched_domain *sd) +{ + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_3) + return 100+(sd->imbalance_pct-100)*4; + + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_2) + return 100+(sd->imbalance_pct-100)*2; + + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_1) + return sd->imbalance_pct; + + return 100; +} + /** * init_sd_power_savings_stats - Initialize power savings statistics for * the given sched_domain, during load balancing. @@ -3433,6 +3448,12 @@ static inline int check_power_save_busiest_group(struct sd_lb_stats *sds, { return 0; } + +static inline unsigned int group_capacity_bump_pct(struct sched_domain *sd) +{ + return 100; +} + #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
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