Commit 36715cef authored by Wu Fengguang's avatar Wu Fengguang
Browse files

writeback: skip tmpfs early in balance_dirty_pages_ratelimited_nr() 



This helps prevent tmpfs dirtiers from skewing the per-cpu bdp_ratelimits.

Acked-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
parent e84d0a4f

mm/page-writeback.c

+4 −3
Original line number Diff line number Diff line
@@ -490,9 +490,6 @@ static void balance_dirty_pages(struct address_space *mapping, 
	bool dirty_exceeded = false;

	struct backing_dev_info *bdi = mapping->backing_dev_info;



	if (!bdi_cap_account_dirty(bdi))

		return;



	for (;;) {

		struct writeback_control wbc = {

			.sync_mode	= WB_SYNC_NONE,
@@ -631,9 +628,13 @@ static DEFINE_PER_CPU(unsigned long, bdp_ratelimits) = 0; 
void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,

					unsigned long nr_pages_dirtied)

{

	struct backing_dev_info *bdi = mapping->backing_dev_info;

	unsigned long ratelimit;

	unsigned long *p;



	if (!bdi_cap_account_dirty(bdi))

		return;



	ratelimit = ratelimit_pages;

	if (mapping->backing_dev_info->dirty_exceeded)

		ratelimit = 8;