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Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse source 
Pull core locking changes from Ingo Molnar:
 "The biggest changes:

   - add lockdep support for seqcount/seqlocks structures, this
     unearthed both bugs and required extra annotation.

   - move the various kernel locking primitives to the new
     kernel/locking/ directory"

* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
  block: Use u64_stats_init() to initialize seqcounts
  locking/lockdep: Mark __lockdep_count_forward_deps() as static
  lockdep/proc: Fix lock-time avg computation
  locking/doc: Update references to kernel/mutex.c
  ipv6: Fix possible ipv6 seqlock deadlock
  cpuset: Fix potential deadlock w/ set_mems_allowed
  seqcount: Add lockdep functionality to seqcount/seqlock structures
  net: Explicitly initialize u64_stats_sync structures for lockdep
  locking: Move the percpu-rwsem code to kernel/locking/
  locking: Move the lglocks code to kernel/locking/
  locking: Move the rwsem code to kernel/locking/
  locking: Move the rtmutex code to kernel/locking/
  locking: Move the semaphore core to kernel/locking/
  locking: Move the spinlock code to kernel/locking/
  locking: Move the lockdep code to kernel/locking/
  locking: Move the mutex code to kernel/locking/
  hung_task debugging: Add tracepoint to report the hang
  x86/locking/kconfig: Update paravirt spinlock Kconfig description
  lockstat: Report avg wait and hold times
  lockdep, x86/alternatives: Drop ancient lockdep fixup message
  ...
This commit is contained in:
Linus Torvalds 2013-11-14 16:30:30 +09:00
commit 5e30025a31
83 changed files with 534 additions and 148 deletions
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10
block/blk-cgroup.h
View file

@ -402,6 +402,11 @@ struct request_list *__blk_queue_next_rl(struct request_list *rl,
#define blk_queue_for_each_rl(rl, q) \
for ((rl) = &(q)->root_rl; (rl); (rl) = __blk_queue_next_rl((rl), (q)))
static inline void blkg_stat_init(struct blkg_stat *stat)
{
u64_stats_init(&stat->syncp);
}
/**
* blkg_stat_add - add a value to a blkg_stat
* @stat: target blkg_stat
@ -458,6 +463,11 @@ static inline void blkg_stat_merge(struct blkg_stat *to, struct blkg_stat *from)
blkg_stat_add(to, blkg_stat_read(from));
}
static inline void blkg_rwstat_init(struct blkg_rwstat *rwstat)
{
u64_stats_init(&rwstat->syncp);
}
/**
* blkg_rwstat_add - add a value to a blkg_rwstat
* @rwstat: target blkg_rwstat

10
block/blk-throttle.c
View file

@ -256,6 +256,12 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq)
} \
} while (0)
static void tg_stats_init(struct tg_stats_cpu *tg_stats)
{
blkg_rwstat_init(&tg_stats->service_bytes);
blkg_rwstat_init(&tg_stats->serviced);
}
/*
* Worker for allocating per cpu stat for tgs. This is scheduled on the
* system_wq once there are some groups on the alloc_list waiting for
@ -269,12 +275,16 @@ static void tg_stats_alloc_fn(struct work_struct *work)
alloc_stats:
if (!stats_cpu) {
int cpu;
stats_cpu = alloc_percpu(struct tg_stats_cpu);
if (!stats_cpu) {
/* allocation failed, try again after some time */
schedule_delayed_work(dwork, msecs_to_jiffies(10));
return;
}
for_each_possible_cpu(cpu)
tg_stats_init(per_cpu_ptr(stats_cpu, cpu));
}
spin_lock_irq(&tg_stats_alloc_lock);

25
block/cfq-iosched.c
View file

@ -1508,6 +1508,29 @@ static void cfq_init_cfqg_base(struct cfq_group *cfqg)
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static void cfqg_stats_init(struct cfqg_stats *stats)
{
blkg_rwstat_init(&stats->service_bytes);
blkg_rwstat_init(&stats->serviced);
blkg_rwstat_init(&stats->merged);
blkg_rwstat_init(&stats->service_time);
blkg_rwstat_init(&stats->wait_time);
blkg_rwstat_init(&stats->queued);
blkg_stat_init(&stats->sectors);
blkg_stat_init(&stats->time);
#ifdef CONFIG_DEBUG_BLK_CGROUP
blkg_stat_init(&stats->unaccounted_time);
blkg_stat_init(&stats->avg_queue_size_sum);
blkg_stat_init(&stats->avg_queue_size_samples);
blkg_stat_init(&stats->dequeue);
blkg_stat_init(&stats->group_wait_time);
blkg_stat_init(&stats->idle_time);
blkg_stat_init(&stats->empty_time);
#endif
}
static void cfq_pd_init(struct blkcg_gq *blkg)
{
struct cfq_group *cfqg = blkg_to_cfqg(blkg);
@ -1515,6 +1538,8 @@ static void cfq_pd_init(struct blkcg_gq *blkg)
cfq_init_cfqg_base(cfqg);
cfqg->weight = blkg->blkcg->cfq_weight;
cfqg->leaf_weight = blkg->blkcg->cfq_leaf_weight;
cfqg_stats_init(&cfqg->stats);
cfqg_stats_init(&cfqg->dead_stats);
}
static void cfq_pd_offline(struct blkcg_gq *blkg)