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Subject[PATCH 1/5] Light fragmentation avoidance without usemap: 001_antidefrag_flags
Date
This patch adds a flag __GFP_EASYRCLM.  Allocations using the __GFP_EASYRCLM
flag are expected to be easily reclaimed by syncing with backing storage (be
it a file or swap) or cleaning the buffers and discarding.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/fs/buffer.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/buffer.c
--- linux-2.6.15-rc1-mm2-clean/fs/buffer.c 2005-11-21 19:44:32.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/buffer.c 2005-11-22 16:49:23.000000000 +0000
@@ -1113,7 +1113,8 @@ grow_dev_page(struct block_device *bdev,
struct page *page;
struct buffer_head *bh;

- page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
+ page = find_or_create_page(inode->i_mapping, index,
+ GFP_NOFS|__GFP_EASYRCLM);
if (!page)
return NULL;

diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/fs/compat.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/compat.c
--- linux-2.6.15-rc1-mm2-clean/fs/compat.c 2005-11-21 19:44:32.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/compat.c 2005-11-22 16:49:23.000000000 +0000
@@ -1359,7 +1359,7 @@ static int compat_copy_strings(int argc,
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(GFP_HIGHUSER|__GFP_EASYRCLM);
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/fs/exec.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/exec.c
--- linux-2.6.15-rc1-mm2-clean/fs/exec.c 2005-11-21 19:44:32.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/exec.c 2005-11-22 16:49:23.000000000 +0000
@@ -238,7 +238,7 @@ static int copy_strings(int argc, char _
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(GFP_HIGHUSER|__GFP_EASYRCLM);
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/fs/inode.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/inode.c
--- linux-2.6.15-rc1-mm2-clean/fs/inode.c 2005-11-21 19:44:32.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/fs/inode.c 2005-11-22 16:49:23.000000000 +0000
@@ -146,7 +146,7 @@ static struct inode *alloc_inode(struct
mapping->a_ops = &empty_aops;
mapping->host = inode;
mapping->flags = 0;
- mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
+ mapping_set_gfp_mask(mapping, GFP_HIGHUSER|__GFP_EASYRCLM);
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = &default_backing_dev_info;

diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/include/asm-i386/page.h linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/asm-i386/page.h
--- linux-2.6.15-rc1-mm2-clean/include/asm-i386/page.h 2005-10-28 01:02:08.000000000 +0100
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/asm-i386/page.h 2005-11-22 16:49:23.000000000 +0000
@@ -36,7 +36,8 @@
#define clear_user_page(page, vaddr, pg) clear_page(page)
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)

-#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
+#define alloc_zeroed_user_highpage(vma, vaddr) \
+ alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | __GFP_EASYRCLM, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

/*
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/include/linux/gfp.h linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/linux/gfp.h
--- linux-2.6.15-rc1-mm2-clean/include/linux/gfp.h 2005-11-21 19:44:33.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/linux/gfp.h 2005-11-22 16:49:23.000000000 +0000
@@ -47,6 +47,7 @@ struct vm_area_struct;
#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
+#define __GFP_EASYRCLM ((__force gfp_t)0x40000u) /* Easily reclaimed page */

#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
@@ -55,7 +56,7 @@ 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_HARDWALL)
+ __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_EASYRCLM)

/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
#define GFP_ATOMIC (__GFP_HIGH)
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/include/linux/highmem.h linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/linux/highmem.h
--- linux-2.6.15-rc1-mm2-clean/include/linux/highmem.h 2005-10-28 01:02:08.000000000 +0100
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/include/linux/highmem.h 2005-11-22 16:49:23.000000000 +0000
@@ -47,7 +47,8 @@ static inline void clear_user_highpage(s
static inline struct page *
alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
{
- struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr);
+ struct page *page = alloc_page_vma(GFP_HIGHUSER|__GFP_EASYRCLM,
+ vma, vaddr);

if (page)
clear_user_highpage(page, vaddr);
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/mm/memory.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/memory.c
--- linux-2.6.15-rc1-mm2-clean/mm/memory.c 2005-11-21 19:44:33.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/memory.c 2005-11-22 16:49:23.000000000 +0000
@@ -1378,7 +1378,8 @@ gotten:
if (!new_page)
goto oom;
} else {
- new_page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ new_page = alloc_page_vma(GFP_HIGHUSER|__GFP_EASYRCLM,
+ vma, address);
if (!new_page)
goto oom;
copy_user_highpage(new_page, src_page, address);
@@ -1985,7 +1986,8 @@ retry:

if (unlikely(anon_vma_prepare(vma)))
goto oom;
- page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ page = alloc_page_vma(GFP_HIGHUSER|__GFP_EASYRCLM,
+ vma, address);
if (!page)
goto oom;
copy_user_highpage(page, new_page, address);
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/mm/shmem.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/shmem.c
--- linux-2.6.15-rc1-mm2-clean/mm/shmem.c 2005-11-21 19:44:33.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/shmem.c 2005-11-22 16:49:23.000000000 +0000
@@ -921,7 +921,7 @@ shmem_alloc_page(gfp_t gfp, struct shmem
pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
pvma.vm_pgoff = idx;
pvma.vm_end = PAGE_SIZE;
- page = alloc_page_vma(gfp | __GFP_ZERO, &pvma, 0);
+ page = alloc_page_vma(gfp | __GFP_ZERO | __GFP_EASYRCLM, &pvma, 0);
mpol_free(pvma.vm_policy);
return page;
}
@@ -936,7 +936,7 @@ shmem_swapin(struct shmem_inode_info *in
static inline struct page *
shmem_alloc_page(gfp_t gfp,struct shmem_inode_info *info, unsigned long idx)
{
- return alloc_page(gfp | __GFP_ZERO);
+ return alloc_page(gfp | __GFP_ZERO | __GFP_EASYRCLM);
}
#endif

diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.15-rc1-mm2-clean/mm/swap_state.c linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/swap_state.c
--- linux-2.6.15-rc1-mm2-clean/mm/swap_state.c 2005-11-21 19:44:33.000000000 +0000
+++ linux-2.6.15-rc1-mm2-001_antidefrag_flags/mm/swap_state.c 2005-11-22 16:49:23.000000000 +0000
@@ -341,7 +341,8 @@ struct page *read_swap_cache_async(swp_e
* Get a new page to read into from swap.
*/
if (!new_page) {
- new_page = alloc_page_vma(GFP_HIGHUSER, vma, addr);
+ new_page = alloc_page_vma(GFP_HIGHUSER|__GFP_EASYRCLM,
+ vma, addr);
if (!new_page)
break; /* Out of memory */
}
-
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