On (23/11/06 09:11), Linus Torvalds didst pronounce:
>
>
> On Thu, 23 Nov 2006, Mel Gorman wrote:
> >
> > There are a suprising number of GFP_HIGHUSER users. I've included an
> > untested patch below to give an idea of what the reworked patch would
> > look like.
>
> Thanks. Seeing the patch actually was useful, because I think this isa
> good idea quite regardless of anything else: it adds a certain amount of
> "inherent documentation" when you see a line like
>
> page = alloc_page(GFP_HIGHUNMOVABLE);
>
> because it makes it very obvious that something is going on.
>
> At the same time, I do get the feelign that maybe we should simply go the
> other way: talk about allocating MOVABLE pages instead of talking about
> allocating pages that are NOT movable.
>
I tend to agree. If GFP_HIGHUSER was the movable set of flags, a number
of out-of-tree drivers and new drivers would continue to use it instead of
GFP_HIGHUNMOVABLE. It would need to be periodically audited.
> Because usually it's really that way you think about it: when you allocate
> a _movable_ page, you need to add support for moving it some way (ie you
> need to put it on the proper page-cache lists etc), while a page that you
> don't think about is generally _not_ movable.
>
Good point.
> So: I think this is the right direction, but I would actually prefer to
> see
>
> page = alloc_page(GFP_[HIGH_]MOVABLE);
>
> instead, and then just teach the routines that create movable pages
> (whether they are movable because they are in the page cache, or for some
> other reason) to use that flag instead of GFP_[HIGH]USER.
>
> And the assumption would be that if it's MOVABLE, then it's obviously a
> USER allocation (it it can fail much more eagerly - that's really what the
> whole USER bit ends up meaning internally).
>
This is what the (compile-tested-only on x86) patch looks like for
GFP_HIGH_MOVABLE. The remaining in-tree GFP_HIGHUSER users are infiniband,
kvm, ncpfs, nfs, pipes (possible the most frequent user), m68knommu, hugepages
and kexec.
Signed-off-by: Mel Gorman <[email protected]>
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/fs/compat.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/compat.c
--- linux-2.6.19-rc5-mm2-clean/fs/compat.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/compat.c 2006-11-24 10:17:48.000000000 +0000
@@ -1419,7 +1419,7 @@ static int compat_copy_strings(int argc,
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(GFP_HIGH_MOVABLE);
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/fs/exec.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/exec.c
--- linux-2.6.19-rc5-mm2-clean/fs/exec.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/exec.c 2006-11-24 10:17:48.000000000 +0000
@@ -239,7 +239,7 @@ static int copy_strings(int argc, char _
page = bprm->page[i];
new = 0;
if (!page) {
- page = alloc_page(GFP_HIGHUSER);
+ page = alloc_page(GFP_HIGH_MOVABLE);
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/fs/inode.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/inode.c
--- linux-2.6.19-rc5-mm2-clean/fs/inode.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/fs/inode.c 2006-11-24 10:17:48.000000000 +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_HIGH_MOVABLE);
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = &default_backing_dev_info;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-alpha/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-alpha/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-alpha/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-alpha/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -17,7 +17,7 @@
extern void clear_page(void *page);
#define clear_user_page(page, vaddr, pg) clear_page(page)
-#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vmaddr)
+#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGH_MOVABLE | __GFP_ZERO, vma, vmaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
extern void copy_page(void * _to, void * _from);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-cris/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-cris/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-cris/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-cris/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -20,7 +20,7 @@
#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_HIGH_MOVABLE | __GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-h8300/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-h8300/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-h8300/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-h8300/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -22,7 +22,7 @@
#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_HIGH_MOVABLE | __GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-i386/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-i386/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-i386/page.h 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-i386/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -35,7 +35,7 @@
#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_HIGH_MOVABLE|__GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-ia64/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-ia64/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-ia64/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-ia64/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -89,7 +89,7 @@ do { \
#define alloc_zeroed_user_highpage(vma, vaddr) \
({ \
- struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
+ struct page *page = alloc_page_vma(GFP_HIGH_MOVABLE | __GFP_ZERO, vma, vaddr); \
if (page) \
flush_dcache_page(page); \
page; \
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-m32r/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-m32r/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-m32r/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-m32r/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -16,7 +16,7 @@ extern void copy_page(void *to, void *fr
#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_HIGH_MOVABLE | __GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-s390/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-s390/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-s390/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-s390/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -64,7 +64,7 @@ static inline void copy_page(void *to, v
#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_HIGH_MOVABLE | __GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/asm-x86_64/page.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-x86_64/page.h
--- linux-2.6.19-rc5-mm2-clean/include/asm-x86_64/page.h 2006-11-08 02:24:20.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/asm-x86_64/page.h 2006-11-24 10:17:48.000000000 +0000
@@ -51,7 +51,7 @@ void copy_page(void *, void *);
#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_HIGH_MOVABLE|__GFP_ZERO, vma, vaddr)
#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
/*
* These are used to make use of C type-checking..
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/linux/gfp.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/linux/gfp.h
--- linux-2.6.19-rc5-mm2-clean/include/linux/gfp.h 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/linux/gfp.h 2006-11-24 10:32:26.000000000 +0000
@@ -30,6 +30,9 @@ struct vm_area_struct;
* cannot handle allocation failures.
*
* __GFP_NORETRY: The VM implementation must not retry indefinitely.
+ *
+ * __GFP_MOVABLE: Flag that this page will be movable by the page migration
+ * mechanism
*/
#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
@@ -46,6 +49,7 @@ 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_MOVABLE ((__force gfp_t)0x80000u) /* Page is movable */
#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 +58,8 @@ 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_MOVABLE)
/* This equals 0, but use constants in case they ever change */
#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
@@ -66,6 +71,9 @@ struct vm_area_struct;
#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
__GFP_HIGHMEM)
+#define GFP_HIGH_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
+ __GFP_HARDWALL | __GFP_HIGHMEM | \
+ __GFP_MOVABLE)
#ifdef CONFIG_NUMA
#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/include/linux/highmem.h linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/linux/highmem.h
--- linux-2.6.19-rc5-mm2-clean/include/linux/highmem.h 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/include/linux/highmem.h 2006-11-24 10:17:48.000000000 +0000
@@ -65,7 +65,7 @@ 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_HIGH_MOVABLE, vma, vaddr);
if (page)
clear_user_highpage(page, vaddr);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/mm/memory.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/memory.c
--- linux-2.6.19-rc5-mm2-clean/mm/memory.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/memory.c 2006-11-24 10:17:48.000000000 +0000
@@ -1564,7 +1564,7 @@ gotten:
if (!new_page)
goto oom;
} else {
- new_page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ new_page = alloc_page_vma(GFP_HIGH_MOVABLE, vma, address);
if (!new_page)
goto oom;
cow_user_page(new_page, old_page, address);
@@ -2188,7 +2188,7 @@ retry:
if (unlikely(anon_vma_prepare(vma)))
goto oom;
- page = alloc_page_vma(GFP_HIGHUSER, vma, address);
+ page = alloc_page_vma(GFP_HIGH_MOVABLE, vma, address);
if (!page)
goto oom;
copy_user_highpage(page, new_page, address);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/mm/mempolicy.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/mempolicy.c
--- linux-2.6.19-rc5-mm2-clean/mm/mempolicy.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/mempolicy.c 2006-11-24 10:33:04.000000000 +0000
@@ -598,7 +598,7 @@ static void migrate_page_add(struct page
static struct page *new_node_page(struct page *page, unsigned long node, int **x)
{
- return alloc_pages_node(node, GFP_HIGHUSER, 0);
+ return alloc_pages_node(node, GFP_HIGH_MOVABLE, 0);
}
/*
@@ -714,7 +714,7 @@ static struct page *new_vma_page(struct
{
struct vm_area_struct *vma = (struct vm_area_struct *)private;
- return alloc_page_vma(GFP_HIGHUSER, vma, page_address_in_vma(page, vma));
+ return alloc_page_vma(GFP_HIGH_MOVABLE, vma, page_address_in_vma(page, vma));
}
#else
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/mm/migrate.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/migrate.c
--- linux-2.6.19-rc5-mm2-clean/mm/migrate.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/migrate.c 2006-11-24 10:17:48.000000000 +0000
@@ -748,7 +748,7 @@ static struct page *new_page_node(struct
*result = &pm->status;
- return alloc_pages_node(pm->node, GFP_HIGHUSER | GFP_THISNODE, 0);
+ return alloc_pages_node(pm->node, GFP_HIGH_MOVABLE | GFP_THISNODE, 0);
}
/*
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/mm/swap_prefetch.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/swap_prefetch.c
--- linux-2.6.19-rc5-mm2-clean/mm/swap_prefetch.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/swap_prefetch.c 2006-11-24 10:17:48.000000000 +0000
@@ -204,7 +204,7 @@ static enum trickle_return trickle_swap_
* Get a new page to read from swap. We have already checked the
* watermarks so __alloc_pages will not call on reclaim.
*/
- page = alloc_pages_node(node, GFP_HIGHUSER & ~__GFP_WAIT, 0);
+ page = alloc_pages_node(node, GFP_HIGH_MOVABLE & ~__GFP_WAIT, 0);
if (unlikely(!page)) {
ret = TRICKLE_DELAY;
goto out;
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-clean/mm/swap_state.c linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/swap_state.c
--- linux-2.6.19-rc5-mm2-clean/mm/swap_state.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-mark_HIGH_MOVABLE/mm/swap_state.c 2006-11-24 10:17:48.000000000 +0000
@@ -343,7 +343,7 @@ 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_HIGH_MOVABLE, vma, addr);
if (!new_page)
break; /* Out of memory */
}
-
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