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f2fs: introduce gc_merge mount option

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In this patch, we will add two new mount options: "gc_merge" and
"nogc_merge", when background_gc is on, "gc_merge" option can be
set to let background GC thread to handle foreground GC requests,
it can eliminate the sluggish issue caused by slow foreground GC
operation when GC is triggered from a process with limited I/O
and CPU resources.

Original idea is from Xiang.

Signed-off-by: Gao Xiang <xiang@kernel.org>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2021-03-27 17:57:06 +08:00
committed by Jaegeuk Kim
parent 58ec18d30a
commit d0ad620e58
6 changed files with 65 additions and 8 deletions
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6
Documentation/filesystems/f2fs.rst
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@@ -110,6 +110,12 @@ background_gc=%s Turn on/off cleaning operations, namely garbage
on synchronous garbage collection running in background.
Default value for this option is on. So garbage
collection is on by default.
gc_merge When background_gc is on, this option can be enabled to
let background GC thread to handle foreground GC requests,
it can eliminate the sluggish issue caused by slow foreground
GC operation when GC is triggered from a process with limited
I/O and CPU resources.
nogc_merge Disable GC merge feature.
disable_roll_forward Disable the roll-forward recovery routine
norecovery Disable the roll-forward recovery routine, mounted read-
only (i.e., -o ro,disable_roll_forward)