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f2fs: merge read IOs at ra_nat_pages()
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>
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1 changed files with 4 additions and 7 deletions
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@ -89,13 +89,10 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
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{
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struct address_space *mapping = sbi->meta_inode->i_mapping;
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struct f2fs_nm_info *nm_i = NM_I(sbi);
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struct blk_plug plug;
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struct page *page;
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pgoff_t index;
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int i;
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blk_start_plug(&plug);
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for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
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if (nid >= nm_i->max_nid)
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nid = 0;
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@ -105,15 +102,15 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
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if (!page)
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continue;
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if (PageUptodate(page)) {
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mark_page_accessed(page);
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f2fs_put_page(page, 1);
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continue;
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}
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if (f2fs_readpage(sbi, page, index, READ))
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continue;
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submit_read_page(sbi, page, index, READ_SYNC);
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mark_page_accessed(page);
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f2fs_put_page(page, 0);
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}
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blk_finish_plug(&plug);
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f2fs_submit_read_bio(sbi, READ_SYNC);
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}
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static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
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