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Btrfs: use add_to_page_cache_lru, use __page_cache_alloc

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Pagecache pages should be allocated with __page_cache_alloc, so they
obey pagecache memory policies.

add_to_page_cache_lru is exported, so it should be used. Benefits over
using a private pagevec: neater code, 128 bytes fewer stack used, percpu
lru ordering is preserved, and finally don't need to flush pagevec
before returning so batching may be shared with other LRU insertions.

Signed-off-by: Nick Piggin <npiggin@suse.de>:
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Nick Piggin
2010-03-17 13:31:04 +00:00
committed by Chris Mason
parent 0cad8a1130
commit 28ecb60906
2 changed files with 5 additions and 32 deletions
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15
fs/btrfs/extent_io.c
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@@ -2679,33 +2679,20 @@ int extent_readpages(struct extent_io_tree *tree,
{
struct bio *bio = NULL;
unsigned page_idx;
struct pagevec pvec;
unsigned long bio_flags = 0;
pagevec_init(&pvec, 0);
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
struct page *page = list_entry(pages->prev, struct page, lru);
prefetchw(&page->flags);
list_del(&page->lru);
/*
* what we want to do here is call add_to_page_cache_lru,
* but that isn't exported, so we reproduce it here
*/
if (!add_to_page_cache(page, mapping,
if (!add_to_page_cache_lru(page, mapping,
page->index, GFP_KERNEL)) {
/* open coding of lru_cache_add, also not exported */
page_cache_get(page);
if (!pagevec_add(&pvec, page))
__pagevec_lru_add_file(&pvec);
__extent_read_full_page(tree, page, get_extent,
&bio, 0, &bio_flags);
}
page_cache_release(page);
}
if (pagevec_count(&pvec))
__pagevec_lru_add_file(&pvec);
BUG_ON(!list_empty(pages));
if (bio)
submit_one_bio(READ, bio, 0, bio_flags);