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Commit fa5a734e authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] balance_dirty_pages_ratelimited: take nr_pages arg 



Modify balance_dirty_pages_ratelimited() so that it can take a
number-of-pages-which-I-just-dirtied argument.  For msync().

Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8a143426

include/linux/writeback.h

+9 −1
Original line number Diff line number Diff line
@@ -99,7 +99,15 @@ int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *, 
				      void __user *, size_t *, loff_t *);



void page_writeback_init(void);

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 inline void

balance_dirty_pages_ratelimited(struct address_space *mapping)

{

	balance_dirty_pages_ratelimited_nr(mapping, 1);

}



int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);

int do_writepages(struct address_space *mapping, struct writeback_control *wbc);

int sync_page_range(struct inode *inode, struct address_space *mapping,

mm/page-writeback.c

+15 −9
Original line number Diff line number Diff line
@@ -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)

{