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| author |   Chao Yu <yuchao0@huawei.com> | 2018-06-04 23:20:36 +0800 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2018-06-04 14:33:20 -0700 |
| commit | c29fd0c0e26dacb7a33ad166587059818a94b4e0 (patch) | |
| tree | 6a25f17833047796fccde3cd7c4e17d35199e640 /fs/f2fs/node.c | |
| parent | f2fs: don't change wbc->sync_mode (diff) | |
| download | linux-dev-c29fd0c0e26dacb7a33ad166587059818a94b4e0.tar.xz linux-dev-c29fd0c0e26dacb7a33ad166587059818a94b4e0.zip | |
f2fs: let sync node IO interrupt async one
Although mixed sync/async IOs can have continuous LBA, as they have
different IO priority, block IO scheduler will add them into different
queues and commit them separately, result in splited IOs which causes
wrose performance.
This patch gives high priority to synchronous IO of nodes, means that
once synchronous flow starts, it can interrupt asynchronous writeback
flow of system flusher, so more big IOs can be expected.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/node.c')
| -rw-r--r-- | fs/f2fs/node.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 64ad5466887f..47d0e64a95a8 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1596,21 +1596,28 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi, int step = 0; int nwritten = 0; int ret = 0; - int nr_pages; + int nr_pages, done = 0; pagevec_init(&pvec); next_step: index = 0; - while ((nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index, - PAGECACHE_TAG_DIRTY))) { + while (!done && (nr_pages = pagevec_lookup_tag(&pvec, + NODE_MAPPING(sbi), &index, PAGECACHE_TAG_DIRTY))) { int i; for (i = 0; i < nr_pages; i++) { struct page *page = pvec.pages[i]; bool submitted = false; + /* give a priority to WB_SYNC threads */ + if (atomic_read(&sbi->wb_sync_req[NODE]) && + wbc->sync_mode == WB_SYNC_NONE) { + done = 1; + break; + } + /* * flushing sequence with step: * 0. indirect nodes @@ -1738,6 +1745,11 @@ static int f2fs_write_node_pages(struct address_space *mapping, if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE)) goto skip_write; + if (wbc->sync_mode == WB_SYNC_ALL) + atomic_inc(&sbi->wb_sync_req[NODE]); + else if (atomic_read(&sbi->wb_sync_req[NODE])) + goto skip_write; + trace_f2fs_writepages(mapping->host, wbc, NODE); diff = nr_pages_to_write(sbi, NODE, wbc); @@ -1745,6 +1757,9 @@ static int f2fs_write_node_pages(struct address_space *mapping, f2fs_sync_node_pages(sbi, wbc, true, FS_NODE_IO); blk_finish_plug(&plug); wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff); + + if (wbc->sync_mode == WB_SYNC_ALL) + atomic_dec(&sbi->wb_sync_req[NODE]); return 0; skip_write: |