From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 1 Jun 2005 10:23:12 -0400 From: Martin Hicks Subject: [PATCH 3/4] VM: add __GFP_NORECLAIM Message-ID: <20050601142312.GV14894@localhost> References: <20050601141154.GN14894@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050601141154.GN14894@localhost> Sender: owner-linux-mm@kvack.org Return-Path: To: Linux MM , Andrew Morton Cc: Ray Bryant List-ID: 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 include/linux/gfp.h | 3 ++- include/linux/pagemap.h | 4 ++-- mm/page_alloc.c | 2 ++ 3 files changed, 6 insertions(+), 3 deletions(-) Index: linux-2.6.12-rc5-mm1/include/linux/gfp.h =================================================================== --- linux-2.6.12-rc5-mm1.orig/include/linux/gfp.h 2005-05-26 12:26:57.000000000 -0700 +++ linux-2.6.12-rc5-mm1/include/linux/gfp.h 2005-05-26 12:27:15.000000000 -0700 @@ -39,6 +39,7 @@ struct vm_area_struct; #define __GFP_COMP 0x4000u /* Add compound page metadata */ #define __GFP_ZERO 0x8000u /* Return zeroed page on success */ #define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */ +#define __GFP_NORECLAIM 0x20000u /* No realy zone reclaim during allocation */ #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1) @@ -47,7 +48,7 @@ struct vm_area_struct; #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ - __GFP_NOMEMALLOC) + __GFP_NOMEMALLOC|__GFP_NORECLAIM) #define GFP_ATOMIC (__GFP_HIGH) #define GFP_NOIO (__GFP_WAIT) Index: linux-2.6.12-rc5-mm1/include/linux/pagemap.h =================================================================== --- linux-2.6.12-rc5-mm1.orig/include/linux/pagemap.h 2005-05-26 12:26:57.000000000 -0700 +++ linux-2.6.12-rc5-mm1/include/linux/pagemap.h 2005-05-26 12:27:15.000000000 -0700 @@ -52,12 +52,12 @@ void release_pages(struct page **pages, 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 *); Index: linux-2.6.12-rc5-mm1/mm/page_alloc.c =================================================================== --- linux-2.6.12-rc5-mm1.orig/mm/page_alloc.c 2005-05-26 12:27:11.000000000 -0700 +++ linux-2.6.12-rc5-mm1/mm/page_alloc.c 2005-05-26 12:27:15.000000000 -0700 @@ -729,6 +729,8 @@ check_zone_reclaim(struct zone *z, unsig { if (!z->reclaim_pages) return 0; + if (gfp_mask & __GFP_NORECLAIM) + return 0; return 1; } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org