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| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-03-19 13:31:37 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-03-20 22:10:09 +0900 |
| commit | cdfc41c134d48c1923066bcfa6630b94588ad6bc (patch) | |
| tree | 066af8a1d30379162ed299f3d30275f6e4809ab0 /fs/f2fs/f2fs.h | |
| parent | 40bb0058c871c6ddcd4aff9fe2f5224e59aba47b (diff) | |
| download | lwn-cdfc41c134d48c1923066bcfa6630b94588ad6bc.tar.gz lwn-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 'fs/f2fs/f2fs.h')
| -rw-r--r-- | fs/f2fs/f2fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 59fac1a9f0c2..05c652493f04 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -242,6 +242,7 @@ struct f2fs_nm_info { block_t nat_blkaddr; /* base disk address of NAT */ nid_t max_nid; /* maximum possible node ids */ nid_t next_scan_nid; /* the next nid to be scanned */ + unsigned int ram_thresh; /* control the memory footprint */ /* NAT cache management */ struct radix_tree_root nat_root;/* root of the nat entry cache */ |