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f2fs: merge read IOs at ra_nat_pages()

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Change log from v1:
  o add mark_page_accessed() not to reclaim the nat pages.

This patch changes the policy of submitting read bios at ra_nat_pages.

Previously, f2fs submits small read bios with block plugging.
But, with this patch, f2fs itself merges read bios first and then submits a
large bio, which can reduce the bio handling overheads.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-11-21 13:54:23 +09:00
parent 924b720b58
commit 7107e0a9b1
1 changed files with 4 additions and 7 deletions
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11
fs/f2fs/node.c
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@ -89,13 +89,10 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
{ {
struct address_space *mapping = sbi->meta_inode->i_mapping; struct address_space *mapping = sbi->meta_inode->i_mapping;
struct f2fs_nm_info *nm_i = NM_I(sbi); struct f2fs_nm_info *nm_i = NM_I(sbi);
struct blk_plug plug;
struct page *page; struct page *page;
pgoff_t index; pgoff_t index;
int i; int i;
blk_start_plug(&plug);
for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) { for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
if (nid >= nm_i->max_nid) if (nid >= nm_i->max_nid)
nid = 0; nid = 0;
@ -105,15 +102,15 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
if (!page) if (!page)
continue; continue;
if (PageUptodate(page)) { if (PageUptodate(page)) {
mark_page_accessed(page);
f2fs_put_page(page, 1); f2fs_put_page(page, 1);
continue; continue;
} }
if (f2fs_readpage(sbi, page, index, READ)) submit_read_page(sbi, page, index, READ_SYNC);
continue; mark_page_accessed(page);
f2fs_put_page(page, 0); f2fs_put_page(page, 0);
} }
blk_finish_plug(&plug); f2fs_submit_read_bio(sbi, READ_SYNC);
} }
static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n) static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)