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H A Dsegment.cdiff ba48a33ef6faa573257b2a4181329f2d1eaafed9 Sat Apr 15 01:09:37 CDT 2017 Chao Yu <yuchao0@huawei.com> f2fs: in prior to issue big discard

Keep issuing big size discard in prior instead of the one with random
size, so that we expect that it will help to:
- be quick to recycle unused large space in flash storage device.
- give a chance for
a) wait to merge small piece discards into bigger one, or
b) avoid issuing discards while they have being reallocated by SSR.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
H A Df2fs.hdiff ba48a33ef6faa573257b2a4181329f2d1eaafed9 Sat Apr 15 01:09:37 CDT 2017 Chao Yu <yuchao0@huawei.com> f2fs: in prior to issue big discard

Keep issuing big size discard in prior instead of the one with random
size, so that we expect that it will help to:
- be quick to recycle unused large space in flash storage device.
- give a chance for
a) wait to merge small piece discards into bigger one, or
b) avoid issuing discards while they have being reallocated by SSR.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>