xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

f2fs: don't wait writeback for datas during checkpoint

Browse Source 
Normally, while committing checkpoint, we will wait on all pages to be
writebacked no matter the page is data or metadata, so in scenario where
there are lots of data IO being submitted with metadata, we may suffer
long latency for waiting writeback during checkpoint.

Indeed, we only care about persistence for pages with metadata, but not
pages with data, as file system consistent are only related to metadate,
so in order to avoid encountering long latency in above scenario, let's
recognize and reference metadata in submitted IOs, wait writeback only
for metadatas.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2016-11-16 10:41:20 +08:00
committed by Jaegeuk Kim
parent c79b7ff1d3
commit 36951b38d1
7 changed files with 40 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/f2fs/checkpoint.c
View File

@@ -1002,7 +1002,7 @@ static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
for (;;) {
prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
if (!atomic_read(&sbi->nr_wb_bios))
if (!get_pages(sbi, F2FS_WB_CP_DATA))
break;
io_schedule_timeout(5*HZ);