[PATCH v3] f2fs: add bio cache for IPU

From: Chao Yu
Date: Wed Dec 19 2018 - 04:30:17 EST

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SQLite in Wal mode may trigger sequential IPU write in db-wal file, after
commit d1b3e72d5490 ("f2fs: submit bio of in-place-update pages"), we
lost the chance of merging page in inner managed bio cache, result in
submitting more small-sized IO.

So let's add temporary bio in writepages() to cache mergeable write IO as
much as possible.

Test case:
1. xfs_io -f /mnt/f2fs/file -c "pwrite 0 65536" -c "fsync"
2. xfs_io -f /mnt/f2fs/file -c "pwrite 0 65536" -c "fsync"

Before:
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65544, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65552, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65560, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65568, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65576, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65584, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65592, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65600, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65608, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65616, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65624, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65632, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65640, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65648, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65656, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65664, size = 4096
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), NODE, sector = 57352, size = 4096

After:
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), DATA, sector = 65544, size = 65536
f2fs_submit_write_bio: dev = (251,0)/(251,0), rw = WRITE(S), NODE, sector = 57368, size = 4096

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
v3:
- introduce f2fs_submit_ipu_bio() to check page Writeback status.
fs/f2fs/data.c | 85 ++++++++++++++++++++++++++++++++++++++++++-----
fs/f2fs/f2fs.h | 3 ++
fs/f2fs/segment.c | 5 ++-
3 files changed, 84 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index cdfe9a7b856e..e5cd3fd9e215 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -341,20 +341,20 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
io->bio = NULL;
}

-static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
+static bool __has_merged_page(struct bio *bio, struct inode *inode,
struct page *page, nid_t ino)
{
struct bio_vec *bvec;
struct page *target;
int i;

- if (!io->bio)
+ if (!bio)
return false;

if (!inode && !page && !ino)
return true;

- bio_for_each_segment_all(bvec, io->bio, i) {
+ bio_for_each_segment_all(bvec, bio, i) {

if (bvec->bv_page->mapping)
target = bvec->bv_page;
@@ -405,7 +405,7 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
struct f2fs_bio_info *io = sbi->write_io[btype] + temp;

down_read(&io->io_rwsem);
- ret = __has_merged_page(io, inode, page, ino);
+ ret = __has_merged_page(io->bio, inode, page, ino);
up_read(&io->io_rwsem);
}
if (ret)
@@ -474,6 +474,59 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
return 0;
}

+int f2fs_merge_page_bio(struct f2fs_io_info *fio)
+{
+ struct bio *bio = *fio->bio;
+ struct page *page = fio->encrypted_page ?
+ fio->encrypted_page : fio->page;
+
+ if (!f2fs_is_valid_blkaddr(fio->sbi, fio->new_blkaddr,
+ __is_meta_io(fio) ? META_GENERIC : DATA_GENERIC))
+ return -EFAULT;
+
+ trace_f2fs_submit_page_bio(page, fio);
+ f2fs_trace_ios(fio, 0);
+
+ if (bio && (*fio->last_block + 1 != fio->new_blkaddr ||
+ !__same_bdev(fio->sbi, fio->new_blkaddr, bio))) {
+ __submit_bio(fio->sbi, bio, fio->type);
+ bio = NULL;
+ }
+alloc_new:
+ if (!bio) {
+ bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc,
+ BIO_MAX_PAGES, false, fio->type, fio->temp);
+ *fio->last_block = fio->new_blkaddr;
+ bio_set_op_attrs(bio, fio->op, fio->op_flags);
+ }
+
+ if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+ __submit_bio(fio->sbi, bio, fio->type);
+ bio = NULL;
+ goto alloc_new;
+ }
+
+ if (fio->io_wbc)
+ wbc_account_io(fio->io_wbc, page, PAGE_SIZE);
+
+ *fio->last_block = fio->new_blkaddr;
+
+ inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page));
+
+ *fio->bio = bio;
+ return 0;
+}
+
+void f2fs_submit_ipu_bio(struct f2fs_sb_info *sbi, struct bio *bio,
+ struct page *page)
+{
+ if (!__has_merged_page(bio, NULL, page, 0))
+ return;
+
+ if (bio)
+ __submit_bio(sbi, bio, DATA);
+}
+
void f2fs_submit_page_write(struct f2fs_io_info *fio)
{
struct f2fs_sb_info *sbi = fio->sbi;
@@ -1903,6 +1956,8 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
}

static int __write_data_page(struct page *page, bool *submitted,
+ struct bio **bio,
+ sector_t *last_block,
struct writeback_control *wbc,
enum iostat_type io_type)
{
@@ -1928,6 +1983,8 @@ static int __write_data_page(struct page *page, bool *submitted,
.need_lock = LOCK_RETRY,
.io_type = io_type,
.io_wbc = wbc,
+ .bio = bio,
+ .last_block = last_block,
};

trace_f2fs_writepage(page, DATA);
@@ -2029,6 +2086,10 @@ static int __write_data_page(struct page *page, bool *submitted,
f2fs_balance_fs(sbi, need_balance_fs);

if (unlikely(f2fs_cp_error(sbi))) {
+ if (bio && *bio) {
+ __submit_bio(sbi, *bio, DATA);
+ *bio = NULL;
+ }
f2fs_submit_merged_write(sbi, DATA);
submitted = NULL;
}
@@ -2055,7 +2116,7 @@ static int __write_data_page(struct page *page, bool *submitted,
static int f2fs_write_data_page(struct page *page,
struct writeback_control *wbc)
{
- return __write_data_page(page, NULL, wbc, FS_DATA_IO);
+ return __write_data_page(page, NULL, NULL, NULL, wbc, FS_DATA_IO);
}

/*
@@ -2071,6 +2132,8 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
int done = 0;
struct pagevec pvec;
struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
+ struct bio *bio = NULL;
+ sector_t last_block;
int nr_pages;
pgoff_t uninitialized_var(writeback_index);
pgoff_t index;
@@ -2147,17 +2210,20 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
}

if (PageWriteback(page)) {
- if (wbc->sync_mode != WB_SYNC_NONE)
+ if (wbc->sync_mode != WB_SYNC_NONE) {
f2fs_wait_on_page_writeback(page,
DATA, true);
- else
+ f2fs_submit_ipu_bio(sbi, bio, page);
+ } else {
goto continue_unlock;
+ }
}

if (!clear_page_dirty_for_io(page))
goto continue_unlock;

- ret = __write_data_page(page, &submitted, wbc, io_type);
+ ret = __write_data_page(page, &submitted, &bio,
+ &last_block, wbc, io_type);
if (unlikely(ret)) {
/*
* keep nr_to_write, since vfs uses this to
@@ -2206,6 +2272,9 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
if (nwritten)
f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
NULL, 0, DATA);
+ /* submit cached bio of IPU write */
+ if (bio)
+ __submit_bio(sbi, bio, DATA);

return ret;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9e56c78fe519..eeede26339a8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1044,6 +1044,8 @@ struct f2fs_io_info {
bool retry; /* need to reallocate block address */
enum iostat_type io_type; /* io type */
struct writeback_control *io_wbc; /* writeback control */
+ struct bio **bio; /* bio for ipu */
+ sector_t *last_block; /* last block number in bio */
unsigned char version; /* version of the node */
};

@@ -3105,6 +3107,7 @@ void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
nid_t ino, enum page_type type);
void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi);
int f2fs_submit_page_bio(struct f2fs_io_info *fio);
+int f2fs_merge_page_bio(struct f2fs_io_info *fio);
void f2fs_submit_page_write(struct f2fs_io_info *fio);
struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
block_t blk_addr, struct bio *bio);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3241e0619275..a361d61b005e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3163,7 +3163,10 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)

stat_inc_inplace_blocks(fio->sbi);

- err = f2fs_submit_page_bio(fio);
+ if (fio->bio)
+ err = f2fs_merge_page_bio(fio);
+ else
+ err = f2fs_submit_page_bio(fio);
if (!err)
update_device_state(fio);

--
2.18.0.rc1

Next message: Xiaowei Bao: "RE: [PATCHv3 4/4] misc: pci_endpoint_test: Add the layerscape EP device support"
Previous message: Christian Brauner: "Re: [PATCH v3] binder: implement binderfs"
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