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f2fs: support lower priority asynchronous readahead in ra_meta_pages

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Now, we use ra_meta_pages to reads continuous physical blocks as much as
possible to improve performance of following reads. However, ra_meta_pages
uses a synchronous readahead approach by submitting bio with READ, as READ
is with high priority, it can not be used in the case of preloading blocks,
and it's not sure when these RAed pages will be used.

This patch supports asynchronous readahead in ra_meta_pages by tagging bio
with READA flag in order to allow preloading.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2015-10-12 17:05:59 +08:00
committed by Jaegeuk Kim
parent 2b947003fa
commit 26879fb101
6 changed files with 14 additions and 12 deletions
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5
fs/f2fs/node.c
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@@ -1529,7 +1529,8 @@ static void build_free_nids(struct f2fs_sb_info *sbi)
return;
/* readahead nat pages to be scanned */
ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES, META_NAT);
ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
META_NAT, true);
while (1) {
struct page *page = get_current_nat_page(sbi, nid);
@@ -1804,7 +1805,7 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
nrpages = min(last_offset - i, bio_blocks);
/* readahead node pages */
ra_meta_pages(sbi, addr, nrpages, META_POR);
ra_meta_pages(sbi, addr, nrpages, META_POR, true);
for (idx = addr; idx < addr + nrpages; idx++) {
struct page *page = get_tmp_page(sbi, idx);