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Date: Sat, 17 Aug 2013 15:31:20 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andi Kleen <andi@...stfloor.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Greg Thelen <gthelen@...gle.com>,
Christoph Hellwig <hch@...radead.org>,
Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Mel Gorman <mgorman@...e.de>,
Minchan Kim <minchan.kim@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Rik van Riel <riel@...hat.com>,
Michel Lespinasse <walken@...gle.com>,
Seth Jennings <sjenning@...ux.vnet.ibm.com>,
Roman Gushchin <klamm@...dex-team.ru>,
Ozgun Erdogan <ozgun@...usdata.com>,
Metin Doslu <metin@...usdata.com>,
Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 6/9] mm + fs: provide shadow pages to page cache allocations
In order to make informed placement and reclaim decisions, the page
cache allocation requires the shadow information of refaulting pages.
Every site that does a find_or_create()-style page cache allocation is
converted to pass the shadow page found in the faulting slot of the
radix tree to page_cache_alloc(), where it can be used in subsequent
patches to influence reclaim behavior.
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
drivers/staging/lustre/lustre/llite/dir.c | 2 +-
fs/btrfs/compression.c | 2 +-
fs/cachefiles/rdwr.c | 13 +++++----
fs/ceph/xattr.c | 2 +-
fs/logfs/readwrite.c | 6 ++--
fs/ntfs/file.c | 7 +++--
fs/splice.c | 6 ++--
include/linux/pagemap.h | 20 ++++++++------
mm/filemap.c | 46 +++++++++++++++++--------------
mm/readahead.c | 2 +-
net/ceph/pagelist.c | 4 +--
net/ceph/pagevec.c | 2 +-
12 files changed, 61 insertions(+), 51 deletions(-)
diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index 2ca8c45..ac63e4d 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -172,7 +172,7 @@ static int ll_dir_filler(void *_hash, struct page *page0)
max_pages = 1;
}
for (npages = 1; npages < max_pages; npages++) {
- page = page_cache_alloc_cold(inode->i_mapping);
+ page = page_cache_alloc_cold(inode->i_mapping, NULL);
if (!page)
break;
page_pool[npages] = page;
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 5ce2c0f..f23bb17 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -483,7 +483,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
}
page = __page_cache_alloc(mapping_gfp_mask(mapping) &
- ~__GFP_FS);
+ ~__GFP_FS, page);
if (!page)
break;
diff --git a/fs/cachefiles/rdwr.c b/fs/cachefiles/rdwr.c
index ebaff36..1b34a42 100644
--- a/fs/cachefiles/rdwr.c
+++ b/fs/cachefiles/rdwr.c
@@ -254,13 +254,13 @@ static int cachefiles_read_backing_file_one(struct cachefiles_object *object,
newpage = NULL;
for (;;) {
- backpage = find_get_page(bmapping, netpage->index);
- if (backpage)
+ backpage = __find_get_page(bmapping, netpage->index);
+ if (backpage && !radix_tree_exceptional_entry(backpage))
goto backing_page_already_present;
if (!newpage) {
newpage = __page_cache_alloc(cachefiles_gfp |
- __GFP_COLD);
+ __GFP_COLD, backpage);
if (!newpage)
goto nomem_monitor;
}
@@ -499,13 +499,14 @@ static int cachefiles_read_backing_file(struct cachefiles_object *object,
}
for (;;) {
- backpage = find_get_page(bmapping, netpage->index);
- if (backpage)
+ backpage = __find_get_page(bmapping, netpage->index);
+ if (backpage && !radix_tree_exceptional_entry(backpage))
goto backing_page_already_present;
if (!newpage) {
newpage = __page_cache_alloc(cachefiles_gfp |
- __GFP_COLD);
+ __GFP_COLD,
+ backpage);
if (!newpage)
goto nomem;
}
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index be661d8..a5d2b86 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -816,7 +816,7 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
return -ENOMEM;
err = -ENOMEM;
for (i = 0; i < nr_pages; i++) {
- pages[i] = __page_cache_alloc(GFP_NOFS);
+ pages[i] = __page_cache_alloc(GFP_NOFS, NULL);
if (!pages[i]) {
nr_pages = i;
goto out;
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index 9a59cba..67c669a 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -316,9 +316,9 @@ static struct page *logfs_get_write_page(struct inode *inode, u64 bix,
int err;
repeat:
- page = find_get_page(mapping, index);
- if (!page) {
- page = __page_cache_alloc(GFP_NOFS);
+ page = __find_get_page(mapping, index);
+ if (!page || radix_tree_exceptional_entry(page)) {
+ page = __page_cache_alloc(GFP_NOFS, page);
if (!page)
return NULL;
err = add_to_page_cache_lru(page, mapping, index, GFP_NOFS);
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index c5670b8..7aee2d1 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -413,10 +413,11 @@ static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
BUG_ON(!nr_pages);
err = nr = 0;
do {
- pages[nr] = find_lock_page(mapping, index);
- if (!pages[nr]) {
+ pages[nr] = __find_lock_page(mapping, index);
+ if (!pages[nr] || radix_tree_exceptional_entry(pages[nr])) {
if (!*cached_page) {
- *cached_page = page_cache_alloc(mapping);
+ *cached_page = page_cache_alloc(mapping,
+ pages[nr]);
if (unlikely(!*cached_page)) {
err = -ENOMEM;
goto err_out;
diff --git a/fs/splice.c b/fs/splice.c
index 3b7ee65..edc54ae 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -353,12 +353,12 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
* Page could be there, find_get_pages_contig() breaks on
* the first hole.
*/
- page = find_get_page(mapping, index);
- if (!page) {
+ page = __find_get_page(mapping, index);
+ if (!page || radix_tree_exceptional_entry(page)) {
/*
* page didn't exist, allocate one.
*/
- page = page_cache_alloc_cold(mapping);
+ page = page_cache_alloc_cold(mapping, page);
if (!page)
break;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index db3a78b..4b24236 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -228,28 +228,32 @@ static inline void page_unfreeze_refs(struct page *page, int count)
}
#ifdef CONFIG_NUMA
-extern struct page *__page_cache_alloc(gfp_t gfp);
+extern struct page *__page_cache_alloc(gfp_t gfp, struct page *shadow);
#else
-static inline struct page *__page_cache_alloc(gfp_t gfp)
+static inline struct page *__page_cache_alloc(gfp_t gfp, struct page *shadow)
{
return alloc_pages(gfp, 0);
}
#endif
-static inline struct page *page_cache_alloc(struct address_space *x)
+static inline struct page *page_cache_alloc(struct address_space *x,
+ struct page *shadow)
{
- return __page_cache_alloc(mapping_gfp_mask(x));
+ return __page_cache_alloc(mapping_gfp_mask(x), shadow);
}
-static inline struct page *page_cache_alloc_cold(struct address_space *x)
+static inline struct page *page_cache_alloc_cold(struct address_space *x,
+ struct page *shadow)
{
- return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_COLD);
+ return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_COLD, shadow);
}
-static inline struct page *page_cache_alloc_readahead(struct address_space *x)
+static inline struct page *page_cache_alloc_readahead(struct address_space *x,
+ struct page *shadow)
{
return __page_cache_alloc(mapping_gfp_mask(x) |
- __GFP_COLD | __GFP_NORETRY | __GFP_NOWARN);
+ __GFP_COLD | __GFP_NORETRY | __GFP_NOWARN,
+ shadow);
}
typedef int filler_t(void *, struct page *);
diff --git a/mm/filemap.c b/mm/filemap.c
index 34b2f0b..d3e5578 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -538,7 +538,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
#ifdef CONFIG_NUMA
-struct page *__page_cache_alloc(gfp_t gfp)
+struct page *__page_cache_alloc(gfp_t gfp, struct page *shadow)
{
int n;
struct page *page;
@@ -917,9 +917,9 @@ struct page *find_or_create_page(struct address_space *mapping,
struct page *page;
int err;
repeat:
- page = find_lock_page(mapping, index);
- if (!page) {
- page = __page_cache_alloc(gfp_mask);
+ page = __find_lock_page(mapping, index);
+ if (!page || radix_tree_exceptional_entry(page)) {
+ page = __page_cache_alloc(gfp_mask, page);
if (!page)
return NULL;
/*
@@ -1222,15 +1222,16 @@ EXPORT_SYMBOL(find_get_pages_tag);
struct page *
grab_cache_page_nowait(struct address_space *mapping, pgoff_t index)
{
- struct page *page = find_get_page(mapping, index);
+ struct page *page = __find_get_page(mapping, index);
- if (page) {
+ if (page && !radix_tree_exceptional_entry(page)) {
if (trylock_page(page))
return page;
page_cache_release(page);
return NULL;
}
- page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~__GFP_FS);
+ page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~__GFP_FS,
+ page);
if (page && add_to_page_cache_lru(page, mapping, index, GFP_NOFS)) {
page_cache_release(page);
page = NULL;
@@ -1304,8 +1305,9 @@ find_page:
page_cache_sync_readahead(mapping,
ra, filp,
index, last_index - index);
- page = find_get_page(mapping, index);
- if (unlikely(page == NULL))
+ page = __find_get_page(mapping, index);
+ if (unlikely(page == NULL ||
+ radix_tree_exceptional_entry(page)))
goto no_cached_page;
}
if (PageReadahead(page)) {
@@ -1464,7 +1466,7 @@ no_cached_page:
* Ok, it wasn't cached, so we need to create a new
* page..
*/
- page = page_cache_alloc_cold(mapping);
+ page = page_cache_alloc_cold(mapping, page);
if (!page) {
desc->error = -ENOMEM;
goto out;
@@ -1673,18 +1675,20 @@ EXPORT_SYMBOL(generic_file_aio_read);
* page_cache_read - adds requested page to the page cache if not already there
* @file: file to read
* @offset: page index
+ * @shadow: shadow page of the page to be added
*
* This adds the requested page to the page cache if it isn't already there,
* and schedules an I/O to read in its contents from disk.
*/
-static int page_cache_read(struct file *file, pgoff_t offset)
+static int page_cache_read(struct file *file, pgoff_t offset,
+ struct page *shadow)
{
struct address_space *mapping = file->f_mapping;
struct page *page;
int ret;
do {
- page = page_cache_alloc_cold(mapping);
+ page = page_cache_alloc_cold(mapping, shadow);
if (!page)
return -ENOMEM;
@@ -1815,8 +1819,8 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
ret = VM_FAULT_MAJOR;
retry_find:
- page = find_get_page(mapping, offset);
- if (!page)
+ page = __find_get_page(mapping, offset);
+ if (!page || radix_tree_exceptional_entry(page))
goto no_cached_page;
}
@@ -1859,7 +1863,7 @@ no_cached_page:
* We're only likely to ever get here if MADV_RANDOM is in
* effect.
*/
- error = page_cache_read(file, offset);
+ error = page_cache_read(file, offset, page);
/*
* The page we want has now been added to the page cache.
@@ -1981,9 +1985,9 @@ static struct page *__read_cache_page(struct address_space *mapping,
struct page *page;
int err;
repeat:
- page = find_get_page(mapping, index);
- if (!page) {
- page = __page_cache_alloc(gfp | __GFP_COLD);
+ page = __find_get_page(mapping, index);
+ if (!page || radix_tree_exceptional_entry(page)) {
+ page = __page_cache_alloc(gfp | __GFP_COLD, page);
if (!page)
return ERR_PTR(-ENOMEM);
err = add_to_page_cache_lru(page, mapping, index, gfp);
@@ -2454,11 +2458,11 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
if (flags & AOP_FLAG_NOFS)
gfp_notmask = __GFP_FS;
repeat:
- page = find_lock_page(mapping, index);
- if (page)
+ page = __find_lock_page(mapping, index);
+ if (page && !radix_tree_exceptional_entry(page))
goto found;
- page = __page_cache_alloc(gfp_mask & ~gfp_notmask);
+ page = __page_cache_alloc(gfp_mask & ~gfp_notmask, page);
if (!page)
return NULL;
status = add_to_page_cache_lru(page, mapping, index,
diff --git a/mm/readahead.c b/mm/readahead.c
index 0f85996..58142ef 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -182,7 +182,7 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
if (page && !radix_tree_exceptional_entry(page))
continue;
- page = page_cache_alloc_readahead(mapping);
+ page = page_cache_alloc_readahead(mapping, page);
if (!page)
break;
page->index = page_offset;
diff --git a/net/ceph/pagelist.c b/net/ceph/pagelist.c
index 92866be..83fb56e 100644
--- a/net/ceph/pagelist.c
+++ b/net/ceph/pagelist.c
@@ -32,7 +32,7 @@ static int ceph_pagelist_addpage(struct ceph_pagelist *pl)
struct page *page;
if (!pl->num_pages_free) {
- page = __page_cache_alloc(GFP_NOFS);
+ page = __page_cache_alloc(GFP_NOFS, NULL);
} else {
page = list_first_entry(&pl->free_list, struct page, lru);
list_del(&page->lru);
@@ -83,7 +83,7 @@ int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space)
space = (space + PAGE_SIZE - 1) >> PAGE_SHIFT; /* conv to num pages */
while (space > pl->num_pages_free) {
- struct page *page = __page_cache_alloc(GFP_NOFS);
+ struct page *page = __page_cache_alloc(GFP_NOFS, NULL);
if (!page)
return -ENOMEM;
list_add_tail(&page->lru, &pl->free_list);
diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
index 815a224..ff76422 100644
--- a/net/ceph/pagevec.c
+++ b/net/ceph/pagevec.c
@@ -79,7 +79,7 @@ struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags)
if (!pages)
return ERR_PTR(-ENOMEM);
for (i = 0; i < num_pages; i++) {
- pages[i] = __page_cache_alloc(flags);
+ pages[i] = __page_cache_alloc(flags, NULL);
if (pages[i] == NULL) {
ceph_release_page_vector(pages, i);
return ERR_PTR(-ENOMEM);
--
1.8.3.2
--
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