Try to avoid page reclaim waits when writing to ramfs/sysfs etc.
Maybe not a big deal...
CC: Johannes Weiner <jweiner@xxxxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---
mm/filemap.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- linux.orig/mm/filemap.c 2012-02-28 10:24:12.000000000 +0800
+++ linux/mm/filemap.c 2012-02-28 10:25:55.568321275 +0800
@@ -2340,9 +2340,13 @@ struct page *grab_cache_page_write_begin
int status;
gfp_t gfp_mask;
struct page *page;
- gfp_t lru_gfp_mask = GFP_KERNEL | __GFP_WRITE;
+ gfp_t lru_gfp_mask = GFP_KERNEL;
- gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
+ gfp_mask = mapping_gfp_mask(mapping);
+ if (mapping_cap_account_dirty(mapping)) {
+ gfp_mask |= __GFP_WRITE;
+ lru_gfp_mask |= __GFP_WRITE;
+ }
if (flags & AOP_FLAG_NOFS) {
gfp_mask &= ~__GFP_FS;
lru_gfp_mask &= ~__GFP_FS;
--
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