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Date: Mon, 24 Jan 2011 15:33:52 +0800 From: Yong Zhang <yong.zhang0@...il.com> To: Pekka Enberg <penberg@...nel.org> Cc: linux-kernel@...r.kernel.org, mfwitten@...il.com, christian@...dbynature.de, a.p.zijlstra@...llo.nl, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>, Mike Galbraith <efault@....de> Subject: [PATCH V3] sched: fix autogroup nice tune on UP On Mon, Jan 24, 2011 at 08:18:11AM +0200, Pekka Enberg wrote: > I proposed extracting the shares calculation logic in > update_cfs_shares() to reduce code duplication for the SMP and UP > patch. So something like this: Thanks for your example. So something like this? --- From: Yong Zhang <yong.zhang0@...il.com> Subject: [PATCH V3] sched: fix autogroup nice tune on UP When on UP with FAIR_GROUP_SCHED enabled, tune shares only affect tg->shares, but is not reflected on tg->se->load, the reason is update_cfs_shares() do nothing on UP. So introduce update_cfs_shares() for UP && FAIR_GROUP_SCHED. This issue is found when enable autogroup, but also exists on cgroup.cpu on UP. Signed-off-by: Yong Zhang <yong.zhang0@...il.com> Cc: Ingo Molnar <mingo@...e.hu> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Mike Galbraith <efault@....de> --- Changelog from V2: Move share caculation to calc_cfs_shares(), thus save some duplicated code for update_cfs_shares(). Idea from Pekka Enberg. kernel/sched_fair.c | 78 ++++++++++++++++++++++++++++++++++---------------- 1 files changed, 53 insertions(+), 25 deletions(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 77e9166..3547699 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -699,7 +699,8 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) cfs_rq->nr_running--; } -#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED +#ifdef CONFIG_FAIR_GROUP_SCHED +# ifdef CONFIG_SMP static void update_cfs_rq_load_contribution(struct cfs_rq *cfs_rq, int global_update) { @@ -762,6 +763,51 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update) list_del_leaf_cfs_rq(cfs_rq); } +static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg, + long weight_delta) +{ + long load_weight, load, shares; + + load = cfs_rq->load.weight + weight_delta; + + load_weight = atomic_read(&tg->load_weight); + load_weight -= cfs_rq->load_contribution; + load_weight += load; + + shares = (tg->shares * load); + if (load_weight) + shares /= load_weight; + + if (shares < MIN_SHARES) + shares = MIN_SHARES; + if (shares > tg->shares) + shares = tg->shares; + + return shares; +} + +static void update_entity_shares_tick(struct cfs_rq *cfs_rq) +{ + if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) { + update_cfs_load(cfs_rq, 0); + update_cfs_shares(cfs_rq, 0); + } +} +# else /* CONFIG_SMP */ +static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update) +{ +} + +static inline long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg, + long weight_delta) +{ + return tg->shares; +} + +static inline void update_entity_shares_tick(struct cfs_rq *cfs_rq) +{ +} +# endif /* CONFIG_SMP */ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, unsigned long weight) { @@ -782,7 +828,7 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta) { struct task_group *tg; struct sched_entity *se; - long load_weight, load, shares; + long shares; if (!cfs_rq) return; @@ -791,32 +837,14 @@ static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta) se = tg->se[cpu_of(rq_of(cfs_rq))]; if (!se) return; - - load = cfs_rq->load.weight + weight_delta; - - load_weight = atomic_read(&tg->load_weight); - load_weight -= cfs_rq->load_contribution; - load_weight += load; - - shares = (tg->shares * load); - if (load_weight) - shares /= load_weight; - - if (shares < MIN_SHARES) - shares = MIN_SHARES; - if (shares > tg->shares) - shares = tg->shares; +#ifndef CONFIG_SMP + if (likely(se->load.weight == tg->shares)) + return; +#endif + shares = calc_cfs_shares(cfs_rq, tg, weight_delta); reweight_entity(cfs_rq_of(se), se, shares); } - -static void update_entity_shares_tick(struct cfs_rq *cfs_rq) -{ - if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) { - update_cfs_load(cfs_rq, 0); - update_cfs_shares(cfs_rq, 0); - } -} #else /* CONFIG_FAIR_GROUP_SCHED */ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update) { -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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