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authorJaegeuk Kim <jaegeuk@kernel.org>2018-08-09 17:53:34 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2018-08-20 23:13:42 -0700
commit853137cef46ccc490e6fd4b160a1c252d6459842 (patch)
treea2fe0cf5dc9d0bb412fbcd766264ac5d52587558 /Documentation
parentdda9f4b9cac6bdd2a96253b4444d7a6ce5132edb (diff)
downloadlinux-853137cef46ccc490e6fd4b160a1c252d6459842.tar.bz2
f2fs: fix performance issue observed with multi-thread sequential read
This reverts the commit - "b93f771 - f2fs: remove writepages lock" to fix the drop in sequential read throughput. Test: ./tiotest -t 32 -d /data/tio_tmp -f 32 -b 524288 -k 1 -k 3 -L device: UFS Before - read throughput: 185 MB/s total read requests: 85177 (of these ~80000 are 4KB size requests). total write requests: 2546 (of these ~2208 requests are written in 512KB). After - read throughput: 758 MB/s total read requests: 2417 (of these ~2042 are 512KB reads). total write requests: 2701 (of these ~2034 requests are written in 512KB). Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-fs-f2fs8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 9b0123388f18..94a24aedcdb2 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -51,6 +51,14 @@ Description:
Controls the dirty page count condition for the in-place-update
policies.
+What: /sys/fs/f2fs/<disk>/min_seq_blocks
+Date: August 2018
+Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:
+ Controls the dirty page count condition for batched sequential
+ writes in ->writepages.
+
+
What: /sys/fs/f2fs/<disk>/min_hot_blocks
Date: March 2017
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>