diff options
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index c1052ee79f01..c67ddc464721 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -256,8 +256,9 @@ static void balance_dirty_pages(struct address_space *mapping) } /** - * balance_dirty_pages_ratelimited - balance dirty memory state + * balance_dirty_pages_ratelimited_nr - balance dirty memory state * @mapping: address_space which was dirtied + * @nr_pages: number of pages which the caller has just dirtied * * Processes which are dirtying memory should call in here once for each page * which was newly dirtied. The function will periodically check the system's @@ -268,10 +269,12 @@ static void balance_dirty_pages(struct address_space *mapping) * limit we decrease the ratelimiting by a lot, to prevent individual processes * from overshooting the limit by (ratelimit_pages) each. */ -void balance_dirty_pages_ratelimited(struct address_space *mapping) +void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, + unsigned long nr_pages_dirtied) { - static DEFINE_PER_CPU(int, ratelimits) = 0; - long ratelimit; + static DEFINE_PER_CPU(unsigned long, ratelimits) = 0; + unsigned long ratelimit; + unsigned long *p; ratelimit = ratelimit_pages; if (dirty_exceeded) @@ -281,15 +284,18 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping) * Check the rate limiting. Also, we do not want to throttle real-time * tasks in balance_dirty_pages(). Period. */ - if (get_cpu_var(ratelimits)++ >= ratelimit) { - __get_cpu_var(ratelimits) = 0; - put_cpu_var(ratelimits); + preempt_disable(); + p = &__get_cpu_var(ratelimits); + *p += nr_pages_dirtied; + if (unlikely(*p >= ratelimit)) { + *p = 0; + preempt_enable(); balance_dirty_pages(mapping); return; } - put_cpu_var(ratelimits); + preempt_enable(); } -EXPORT_SYMBOL(balance_dirty_pages_ratelimited); +EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr); void throttle_vm_writeout(void) { |