f2fs: issue discard commands proactively in high fs utilization
In the high utilization like over 80%, we don't expect huge # of large discard commands, but do many small pending discards which affects FTL GCs a lot. Let's issue them in that case. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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