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>
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@ -74,3 +74,9 @@ Date: March 2014
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Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
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Description:
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Controls the memory footprint used by f2fs.
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What: /sys/fs/f2fs/<disk>/trim_sections
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Date: February 2015
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Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
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Description:
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Controls the trimming rate in batch mode.
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@ -199,6 +199,10 @@ Files in /sys/fs/f2fs/<devname>
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checkpoint is triggered, and issued during the
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checkpoint. By default, it is disabled with 0.
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trim_sections This parameter controls the number of sections
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to be trimmed out in batch mode when FITRIM
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conducts. 32 sections is set by default.
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ipu_policy This parameter controls the policy of in-place
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updates in f2fs. There are five policies:
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0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
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@ -105,6 +105,10 @@ enum {
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CP_DISCARD,
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};
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#define DEF_BATCHED_TRIM_SECTIONS 32
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#define BATCHED_TRIM_SEGMENTS(sbi) \
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(SM_I(sbi)->trim_sections * (sbi)->segs_per_sec)
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struct cp_control {
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int reason;
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__u64 trim_start;
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@ -448,6 +452,9 @@ struct f2fs_sm_info {
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int nr_discards; /* # of discards in the list */
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int max_discards; /* max. discards to be issued */
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/* for batched trimming */
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unsigned int trim_sections; /* # of sections to trim */
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struct list_head sit_entry_set; /* sit entry set list */
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unsigned int ipu_policy; /* in-place-update policy */
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@ -1066,14 +1066,19 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
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end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
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GET_SEGNO(sbi, end);
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cpc.reason = CP_DISCARD;
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cpc.trim_start = start_segno;
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cpc.trim_end = end_segno;
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cpc.trim_minlen = range->minlen >> sbi->log_blocksize;
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/* do checkpoint to issue discard commands safely */
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for (; start_segno <= end_segno; start_segno = cpc.trim_end + 1) {
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cpc.trim_start = start_segno;
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cpc.trim_end = min_t(unsigned int, rounddown(start_segno +
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BATCHED_TRIM_SEGMENTS(sbi),
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sbi->segs_per_sec) - 1, end_segno);
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mutex_lock(&sbi->gc_mutex);
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write_checkpoint(sbi, &cpc);
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mutex_unlock(&sbi->gc_mutex);
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}
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out:
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range->len = cpc.trimmed << sbi->log_blocksize;
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return 0;
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@ -2127,6 +2132,8 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
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sm_info->nr_discards = 0;
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sm_info->max_discards = 0;
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sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;
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INIT_LIST_HEAD(&sm_info->sit_entry_set);
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if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
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@ -195,6 +195,7 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
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@ -210,6 +211,7 @@ static struct attribute *f2fs_attrs[] = {
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ATTR_LIST(gc_idle),
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ATTR_LIST(reclaim_segments),
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ATTR_LIST(max_small_discards),
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ATTR_LIST(batched_trim_sections),
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ATTR_LIST(ipu_policy),
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ATTR_LIST(min_ipu_util),
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ATTR_LIST(min_fsync_blocks),
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