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Message-Id: <20161230185117.3832-8-jaegeuk@kernel.org>
Date: Fri, 30 Dec 2016 10:51:15 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 08/10] f2fs: relax async discard commands more
This patch relaxes async discard commands to avoid waiting its end_io during
checkpoint.
Instead of waiting them during checkpoint, it will be done when actually reusing
them.
Test on initial partition of nvme drive.
# time fstrim /mnt/test
Before : 6.158s
After : 4.822s
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/checkpoint.c | 3 ---
fs/f2fs/f2fs.h | 4 +++-
fs/f2fs/segment.c | 25 +++++++++++++++++++++----
fs/f2fs/super.c | 3 +++
4 files changed, 27 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 34bfe2b494ae..1a9ba69a22ba 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1254,7 +1254,6 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
f2fs_bug_on(sbi, prefree_segments(sbi));
flush_sit_entries(sbi, cpc);
clear_prefree_segments(sbi, cpc);
- f2fs_wait_all_discard_bio(sbi);
unblock_operations(sbi);
goto out;
}
@@ -1278,8 +1277,6 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
else
clear_prefree_segments(sbi, cpc);
- f2fs_wait_all_discard_bio(sbi);
-
unblock_operations(sbi);
stat_inc_cp_count(sbi->stat_info);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index bdcfe2a9b532..f2f40fce9d31 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -183,6 +183,8 @@ struct discard_entry {
struct bio_entry {
struct list_head list;
+ unsigned int start_segno;
+ unsigned int end_segno;
struct bio *bio;
struct completion event;
int error;
@@ -2111,7 +2113,7 @@ void destroy_flush_cmd_control(struct f2fs_sb_info *, bool);
void invalidate_blocks(struct f2fs_sb_info *, block_t);
bool is_checkpointed_data(struct f2fs_sb_info *, block_t);
void refresh_sit_entry(struct f2fs_sb_info *, block_t, block_t);
-void f2fs_wait_all_discard_bio(struct f2fs_sb_info *);
+void f2fs_wait_discard_bio(struct f2fs_sb_info *, unsigned int);
void clear_prefree_segments(struct f2fs_sb_info *, struct cp_control *);
void release_discard_addrs(struct f2fs_sb_info *);
int npages_for_summary_flush(struct f2fs_sb_info *, bool);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 6d197f0c8151..9a38424c3c1f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -624,20 +624,24 @@ static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
}
static struct bio_entry *__add_bio_entry(struct f2fs_sb_info *sbi,
- struct bio *bio)
+ struct bio *bio, unsigned int start_segno,
+ unsigned int end_segno)
{
struct list_head *wait_list = &(SM_I(sbi)->wait_list);
struct bio_entry *be = f2fs_kmem_cache_alloc(bio_entry_slab, GFP_NOFS);
INIT_LIST_HEAD(&be->list);
be->bio = bio;
+ be->start_segno = start_segno;
+ be->end_segno = end_segno;
init_completion(&be->event);
list_add_tail(&be->list, wait_list);
return be;
}
-void f2fs_wait_all_discard_bio(struct f2fs_sb_info *sbi)
+/* This should be covered by global mutex, &sit_i->sentry_lock */
+void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, unsigned int segno)
{
struct list_head *wait_list = &(SM_I(sbi)->wait_list);
struct bio_entry *be, *tmp;
@@ -646,7 +650,15 @@ void f2fs_wait_all_discard_bio(struct f2fs_sb_info *sbi)
struct bio *bio = be->bio;
int err;
- wait_for_completion_io(&be->event);
+ if (!completion_done(&be->event)) {
+ if ((be->start_segno >= segno &&
+ be->end_segno <= segno) ||
+ segno == NULL_SEGNO)
+ wait_for_completion_io(&be->event);
+ else
+ continue;
+ }
+
err = be->error;
if (err == -EOPNOTSUPP)
err = 0;
@@ -674,6 +686,8 @@ static int __f2fs_issue_discard_async(struct f2fs_sb_info *sbi,
struct block_device *bdev, block_t blkstart, block_t blklen)
{
struct bio *bio = NULL;
+ unsigned int start_segno = GET_SEGNO(sbi, blkstart);
+ unsigned int end_segno = GET_SEGNO(sbi, blkstart + blklen);
int err;
trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
@@ -688,7 +702,8 @@ static int __f2fs_issue_discard_async(struct f2fs_sb_info *sbi,
SECTOR_FROM_BLOCK(blklen),
GFP_NOFS, 0, &bio);
if (!err && bio) {
- struct bio_entry *be = __add_bio_entry(sbi, bio);
+ struct bio_entry *be = __add_bio_entry(sbi, bio,
+ start_segno, end_segno);
bio->bi_private = be;
bio->bi_end_io = f2fs_submit_bio_wait_endio;
@@ -1574,6 +1589,8 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+ f2fs_wait_discard_bio(sbi, GET_SEGNO(sbi, *new_blkaddr));
+
/*
* __add_sum_entry should be resided under the curseg_mutex
* because, this function updates a summary entry in the
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f3697f97e527..16e2bc5209bb 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -770,6 +770,9 @@ static void f2fs_put_super(struct super_block *sb)
write_checkpoint(sbi, &cpc);
}
+ /* be sure to wait for any on-going discard commands */
+ f2fs_wait_discard_bio(sbi, NULL_SEGNO);
+
/* write_checkpoint can update stat informaion */
f2fs_destroy_stats(sbi);
--
2.11.0
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