f2fs: introduce a batched trim
This patch introduces a batched trimming feature, which submits split discard
commands.
This is to avoid long latency due to huge trim commands.
If fstrim was triggered ranging from 0 to the end of device, we should lock
all the checkpoint-related mutexes, resulting in very long latency.
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index db1ff55..337204d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -105,6 +105,10 @@
CP_DISCARD,
};
+#define DEF_BATCHED_TRIM_SECTIONS 32
+#define BATCHED_TRIM_SEGMENTS(sbi) \
+ (SM_I(sbi)->trim_sections * (sbi)->segs_per_sec)
+
struct cp_control {
int reason;
__u64 trim_start;
@@ -448,6 +452,9 @@
int nr_discards; /* # of discards in the list */
int max_discards; /* max. discards to be issued */
+ /* for batched trimming */
+ unsigned int trim_sections; /* # of sections to trim */
+
struct list_head sit_entry_set; /* sit entry set list */
unsigned int ipu_policy; /* in-place-update policy */