From ba48a33ef6faa573257b2a4181329f2d1eaafed9 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Sat, 15 Apr 2017 14:09:37 +0800 Subject: 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 Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/f2fs/f2fs.h') diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index c1faf6d35a8d..d81a365930b5 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -188,6 +188,11 @@ struct discard_entry { unsigned char discard_map[SIT_VBLOCK_MAP_SIZE]; /* segment discard bitmap */ }; +/* max discard pend list number */ +#define MAX_PLIST_NUM 512 +#define plist_idx(blk_num) ((blk_num) >= MAX_PLIST_NUM ? \ + (MAX_PLIST_NUM - 1) : (blk_num - 1)) + enum { D_PREP, D_SUBMIT, @@ -221,7 +226,7 @@ struct discard_cmd { struct discard_cmd_control { struct task_struct *f2fs_issue_discard; /* discard thread */ struct list_head entry_list; /* 4KB discard entry list */ - struct list_head pend_list; /* store pending entries */ + struct list_head pend_list[MAX_PLIST_NUM];/* store pending entries */ struct list_head wait_list; /* store on-flushing entries */ wait_queue_head_t discard_wait_queue; /* waiting queue for wake-up */ struct mutex cmd_lock; -- cgit v1.2.3