From d9872a698c393e0d1abca86bf05b62712cbfc581 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Sun, 6 Aug 2017 22:09:00 -0700 Subject: f2fs: introduce gc_urgent mode for background GC This patch adds a sysfs entry to control urgent mode for background GC. If this is set, background GC thread conducts GC with gc_urgent_sleep_time all the time. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- Documentation/ABI/testing/sysfs-fs-f2fs | 12 ++++++++++++ Documentation/filesystems/f2fs.txt | 9 +++++++++ 2 files changed, 21 insertions(+) (limited to 'Documentation') diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 84c606fb3ca4..621da3fc56c5 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -130,3 +130,15 @@ Date: June 2017 Contact: "Chao Yu" Description: Controls current reserved blocks in system. + +What: /sys/fs/f2fs//gc_urgent +Date: August 2017 +Contact: "Jaegeuk Kim" +Description: + Do background GC agressively + +What: /sys/fs/f2fs//gc_urgent_sleep_time +Date: August 2017 +Contact: "Jaegeuk Kim" +Description: + Controls sleep time of GC urgent mode diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index b8f495a8b67d..84f36896766c 100644 --- a/Documentation/filesystems/f2fs.txt +++ b/Documentation/filesystems/f2fs.txt @@ -210,6 +210,15 @@ Files in /sys/fs/f2fs/ gc_idle = 1 will select the Cost Benefit approach & setting gc_idle = 2 will select the greedy approach. + gc_urgent This parameter controls triggering background GCs + urgently or not. Setting gc_urgent = 0 [default] + makes back to default behavior, while if it is set + to 1, background thread starts to do GC by given + gc_urgent_sleep_time interval. + + gc_urgent_sleep_time This parameter controls sleep time for gc_urgent. + 500 ms is set by default. See above gc_urgent. + reclaim_segments This parameter controls the number of prefree segments to be reclaimed. If the number of prefree segments is larger than the number of segments -- cgit v1.2.3