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 <[email protected]>
---
fs/block_dev.c | 3 ++-
fs/buffer.c | 3 ++-
fs/compat.c | 3 ++-
fs/exec.c | 3 ++-
fs/inode.c | 3 ++-
include/asm-i386/page.h | 4 +++-
include/linux/gfp.h | 12 +++++++++++-
include/linux/highmem.h | 4 +++-
mm/memory.c | 8 ++++++--
mm/swap_state.c | 4 +++-
10 files changed, 36 insertions(+), 11 deletions(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/fs/block_dev.c linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/block_dev.c
--- linux-2.6.18-rc5-mm1-clean/fs/block_dev.c 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/block_dev.c 2006-09-04 18:36:09.000000000 +0100
@@ -380,7 +380,8 @@ struct block_device *bdget(dev_t dev)
inode->i_rdev = dev;
inode->i_bdev = bdev;
inode->i_data.a_ops = &def_blk_aops;
- mapping_set_gfp_mask(&inode->i_data, GFP_USER);
+ mapping_set_gfp_mask(&inode->i_data,
+ set_rclmflags(GFP_USER, __GFP_EASYRCLM));
inode->i_data.backing_dev_info = &default_backing_dev_info;
spin_lock(&bdev_lock);
list_add(&bdev->bd_list, &all_bdevs);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/fs/buffer.c linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/buffer.c
--- linux-2.6.18-rc5-mm1-clean/fs/buffer.c 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/buffer.c 2006-09-04 18:36:09.000000000 +0100
@@ -986,7 +986,8 @@ 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,
+ set_rclmflags(GFP_NOFS, __GFP_EASYRCLM));
if (!page)
return NULL;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/fs/compat.c linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/compat.c
--- linux-2.6.18-rc5-mm1-clean/fs/compat.c 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/compat.c 2006-09-04 18:36:09.000000000 +0100
@@ -1419,7 +1419,8 @@ static int compat_copy_strings(int argc,
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(set_rclmflags(GFP_HIGHUSER,
+ __GFP_EASYRCLM));
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/fs/exec.c linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/exec.c
--- linux-2.6.18-rc5-mm1-clean/fs/exec.c 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/exec.c 2006-09-04 18:36:09.000000000 +0100
@@ -238,7 +238,8 @@ static int copy_strings(int argc, char _
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(set_rclmflags(GFP_HIGHUSER,
+ __GFP_EASYRCLM));
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/fs/inode.c linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/inode.c
--- linux-2.6.18-rc5-mm1-clean/fs/inode.c 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/fs/inode.c 2006-09-04 18:36:09.000000000 +0100
@@ -145,7 +145,8 @@ 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,
+ set_rclmflags(GFP_HIGHUSER, __GFP_EASYRCLM));
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = &default_backing_dev_info;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/include/asm-i386/page.h linux-2.6.18-rc5-mm1-001_antifrag_flags/include/asm-i386/page.h
--- linux-2.6.18-rc5-mm1-clean/include/asm-i386/page.h 2006-08-28 04:41:48.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/include/asm-i386/page.h 2006-09-04 18:36:09.000000000 +0100
@@ -35,7 +35,9 @@
#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(set_rclmflags(GFP_HIGHUSER|__GFP_ZERO, __GFP_EASYRCLM),\
+ vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/include/linux/gfp.h linux-2.6.18-rc5-mm1-001_antifrag_flags/include/linux/gfp.h
--- linux-2.6.18-rc5-mm1-clean/include/linux/gfp.h 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/include/linux/gfp.h 2006-09-04 18:36:09.000000000 +0100
@@ -46,6 +46,7 @@ struct vm_area_struct;
#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_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
+#define __GFP_EASYRCLM ((__force gfp_t)0x80000u) /* 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))
@@ -54,7 +55,11 @@ 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_THISNODE)
+ __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE|\
+ __GFP_EASYRCLM)
+
+/* This mask makes up all the RCLM-related flags */
+#define GFP_RECLAIM_MASK (__GFP_EASYRCLM)
/* This equals 0, but use constants in case they ever change */
#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
@@ -93,6 +98,11 @@ static inline enum zone_type gfp_zone(gf
return ZONE_NORMAL;
}
+static inline gfp_t set_rclmflags(gfp_t gfp, gfp_t reclaim_flags)
+{
+ return (gfp & ~(GFP_RECLAIM_MASK)) | reclaim_flags;
+}
+
/*
* There is only one page-allocator function, and two main namespaces to
* it. The alloc_page*() variants return 'struct page *' and as such
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/include/linux/highmem.h linux-2.6.18-rc5-mm1-001_antifrag_flags/include/linux/highmem.h
--- linux-2.6.18-rc5-mm1-clean/include/linux/highmem.h 2006-09-04 18:34:32.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/include/linux/highmem.h 2006-09-04 18:36:09.000000000 +0100
@@ -61,7 +61,9 @@ 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(
+ set_rclmflags(GFP_HIGHUSER, __GFP_EASYRCLM),
+ vma, vaddr);
if (page)
clear_user_highpage(page, vaddr);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/mm/memory.c linux-2.6.18-rc5-mm1-001_antifrag_flags/mm/memory.c
--- linux-2.6.18-rc5-mm1-clean/mm/memory.c 2006-09-04 18:34:33.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/mm/memory.c 2006-09-04 18:36:09.000000000 +0100
@@ -1562,7 +1562,9 @@ gotten:
if (!new_page)
goto oom;
} else {
- new_page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ new_page = alloc_page_vma(
+ set_rclmflags(GFP_HIGHUSER, __GFP_EASYRCLM),
+ vma, address);
if (!new_page)
goto oom;
cow_user_page(new_page, old_page, address);
@@ -2177,7 +2179,9 @@ retry:
if (unlikely(anon_vma_prepare(vma)))
goto oom;
- page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ page = alloc_page_vma(
+ set_rclmflags(GFP_HIGHUSER, __GFP_EASYRCLM),
+ vma, address);
if (!page)
goto oom;
copy_user_highpage(page, new_page, address);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc5-mm1-clean/mm/swap_state.c linux-2.6.18-rc5-mm1-001_antifrag_flags/mm/swap_state.c
--- linux-2.6.18-rc5-mm1-clean/mm/swap_state.c 2006-09-04 18:34:33.000000000 +0100
+++ linux-2.6.18-rc5-mm1-001_antifrag_flags/mm/swap_state.c 2006-09-04 18:36:09.000000000 +0100
@@ -343,7 +343,9 @@ 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(
+ set_rclmflags(GFP_HIGHUSER, __GFP_EASYRCLM),
+ vma, addr);
if (!new_page)
break; /* Out of memory */
}
-
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