Hi Steven, I posted a suspend-to-ram fix to sched-devel earlier today: http://lkml.org/lkml/2007/12/17/445 This fix should also be applied to -rt as I introduced the same regression there. Here is a version of the fix for 23-rt13. I can submit a version for 24-rc5-rt1 at your request. Regards, -Greg --------------------------------- The baseline code statically builds the span maps when the domain is formed. Previous attempts at dynamically updating the maps caused a suspend-to-ram regression, which should now be fixed. Signed-off-by: Gregory Haskins <ghaskins@xxxxxxxxxx> CC: Gautham R Shenoy <ego@xxxxxxxxxx> --- kernel/sched.c | 28 ++++++++++++++++------------ 1 files changed, 16 insertions(+), 12 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 244c4b5..95b8c99 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -281,8 +281,6 @@ struct rt_rq { * exclusive cpuset is created, we also create and attach a new root-domain * object. * - * By default the system creates a single root-domain with all cpus as - * members (mimicking the global state we have today). */ struct root_domain { atomic_t refcount; @@ -300,6 +298,10 @@ struct root_domain { #endif }; +/* + * By default the system creates a single root-domain with all cpus as + * members (mimicking the global state we have today). + */ static struct root_domain def_root_domain; #endif @@ -6066,6 +6068,10 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd) atomic_inc(&rd->refcount); rq->rd = rd; + cpu_set(rq->cpu, rd->span); + if (cpu_isset(rq->cpu, cpu_online_map)) + cpu_set(rq->cpu, rd->online); + for (class = sched_class_highest; class; class = class->next) { if (class->join_domain) class->join_domain(rq); @@ -6074,12 +6080,12 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd) spin_unlock_irqrestore(&rq->lock, flags); } -static void init_rootdomain(struct root_domain *rd, const cpumask_t *map) +static void init_rootdomain(struct root_domain *rd) { memset(rd, 0, sizeof(*rd)); - rd->span = *map; - cpus_and(rd->online, rd->span, cpu_online_map); + cpus_clear(rd->span); + cpus_clear(rd->online); cpupri_init(&rd->cpupri); @@ -6087,13 +6093,11 @@ static void init_rootdomain(struct root_domain *rd, const cpumask_t *map) static void init_defrootdomain(void) { - cpumask_t cpus = CPU_MASK_ALL; - - init_rootdomain(&def_root_domain, &cpus); + init_rootdomain(&def_root_domain); atomic_set(&def_root_domain.refcount, 1); } -static struct root_domain *alloc_rootdomain(const cpumask_t *map) +static struct root_domain *alloc_rootdomain(void) { struct root_domain *rd; @@ -6101,7 +6105,7 @@ static struct root_domain *alloc_rootdomain(const cpumask_t *map) if (!rd) return NULL; - init_rootdomain(rd, map); + init_rootdomain(rd); return rd; } @@ -6523,7 +6527,7 @@ static int build_sched_domains(const cpumask_t *cpu_map) sched_group_nodes_bycpu[first_cpu(*cpu_map)] = sched_group_nodes; #endif - rd = alloc_rootdomain(cpu_map); + rd = alloc_rootdomain(); if (!rd) { printk(KERN_WARNING "Cannot alloc root domain\n"); return -ENOMEM; @@ -7021,7 +7025,6 @@ void __init sched_init(void) #ifdef CONFIG_SMP rq->sd = NULL; rq->rd = NULL; - rq_attach_root(rq, &def_root_domain); rq->active_balance = 0; rq->next_balance = jiffies; rq->push_cpu = 0; @@ -7030,6 +7033,7 @@ void __init sched_init(void) INIT_LIST_HEAD(&rq->migration_queue); rq->rt.highest_prio = MAX_RT_PRIO; rq->rt.overloaded = 0; + rq_attach_root(rq, &def_root_domain); #endif atomic_set(&rq->nr_iowait, 0); - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
