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writeback: skip tmpfs early in balance_dirty_pages_ratelimited_nr()

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

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
This commit is contained in:
Wu Fengguang
2011-06-11 17:53:57 -06:00
parent e84d0a4f8e
commit 36715cef07
1 changed files with 4 additions and 3 deletions
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7
mm/page-writeback.c
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@@ -490,9 +490,6 @@ static void balance_dirty_pages(struct address_space *mapping,
bool dirty_exceeded = false; bool dirty_exceeded = false;
struct backing_dev_info *bdi = mapping->backing_dev_info; struct backing_dev_info *bdi = mapping->backing_dev_info;
if (!bdi_cap_account_dirty(bdi))
return;
for (;;) { for (;;) {
struct writeback_control wbc = { struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE, .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, void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
unsigned long nr_pages_dirtied) unsigned long nr_pages_dirtied)
{ {
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long ratelimit; unsigned long ratelimit;
unsigned long *p; unsigned long *p;
if (!bdi_cap_account_dirty(bdi))
return;
ratelimit = ratelimit_pages; ratelimit = ratelimit_pages;
if (mapping->backing_dev_info->dirty_exceeded) if (mapping->backing_dev_info->dirty_exceeded)
ratelimit = 8; ratelimit = 8;