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| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-03-19 05:31:37 +0100 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-03-20 14:10:09 +0100 |
| commit | cdfc41c134d48c1923066bcfa6630b94588ad6bc (patch) | |
| tree | 066af8a1d30379162ed299f3d30275f6e4809ab0 /Documentation | |
| parent | f2fs: avoid to drop nat entries due to the negative nr_shrink (diff) | |
| download | linux-cdfc41c134d48c1923066bcfa6630b94588ad6bc.tar.xz linux-cdfc41c134d48c1923066bcfa6630b94588ad6bc.zip | |
f2fs: throttle the memory footprint with a sysfs entry
This patch introduces ram_thresh, a sysfs entry, which controls the memory
footprint used by the free nid list and the nat cache.
Previously, the free nid list was controlled by MAX_FREE_NIDS, while the nat
cache was managed by NM_WOUT_THRESHOLD.
However, this approach cannot be applied dynamically according to the system.
So, this patch adds ram_thresh that users can specify the threshold, which is
in order of 1 / 1024.
For example, if the total ram size is 4GB and the value is set to 10 by default,
f2fs tries to control the number of free nids and nat caches not to consume over
10 * (4GB / 1024) = 10MB.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 6 | ||||
| -rw-r--r-- | Documentation/filesystems/f2fs.txt | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 32b0809203dd..4ac2c25025ea 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -55,3 +55,9 @@ Date: January 2014 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com> Description: Controls the number of trials to find a victim segment. + +What: /sys/fs/f2fs/<disk>/ram_thresh +Date: March 2014 +Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com> +Description: + Controls the memory footprint used by f2fs. diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt index 803784e1e8ef..f415b9fc4cc8 100644 --- a/Documentation/filesystems/f2fs.txt +++ b/Documentation/filesystems/f2fs.txt @@ -202,6 +202,10 @@ Files in /sys/fs/f2fs/<devname> Otherwise, it needs to decrease this value to reduce the space overhead. The default value is 0. + ram_thresh This parameter controls the memory footprint used + by free nids and cached nat entries. By default, + 10 is set, which indicates 10 MB / 1 GB RAM. + ================================================================================ USAGE ================================================================================ |