[PATCH] VM: add __GFP_NORECLAIM
When using the early zone reclaim, it was noticed that allocating new pages
that should be spread across the whole system caused eviction of local pages.
This adds a new GFP flag to prevent early reclaim from happening during
certain allocation attempts. The example that is implemented here is for page
cache pages. We want page cache pages to be spread across the whole system,
and we don't want page cache pages to evict other pages to get local memory.
Signed-off-by: Martin Hicks <mort@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 0422031..d9a2564 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -52,12 +52,12 @@
static inline struct page *page_cache_alloc(struct address_space *x)
{
- return alloc_pages(mapping_gfp_mask(x), 0);
+ return alloc_pages(mapping_gfp_mask(x)|__GFP_NORECLAIM, 0);
}
static inline struct page *page_cache_alloc_cold(struct address_space *x)
{
- return alloc_pages(mapping_gfp_mask(x)|__GFP_COLD, 0);
+ return alloc_pages(mapping_gfp_mask(x)|__GFP_COLD|__GFP_NORECLAIM, 0);
}
typedef int filler_t(void *, struct page *);