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Date: Mon, 8 May 2017 14:23:24 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: split bio cache
Hi Chao,
I can't see a strong reason to split meta from data/node and rename the existing
function names. Instead, how about keeping the existing one while adding some
page types to deal with log types?
Thanks,
On 05/08, Chao Yu wrote:
> Split DATA/NODE type bio cache according to different temperature,
> so write IOs with the same temperature can be merged in corresponding
> bio cache as much as possible, otherwise, different temperature write
> IOs submitting into one bio cache will always cause split of bio.
>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> fs/f2fs/checkpoint.c | 10 +++----
> fs/f2fs/data.c | 78 ++++++++++++++++++++++++++++++++--------------------
> fs/f2fs/f2fs.h | 15 ++++++----
> fs/f2fs/gc.c | 5 ++--
> fs/f2fs/node.c | 8 +++---
> fs/f2fs/segment.c | 14 +++++++---
> fs/f2fs/super.c | 16 ++++++-----
> 7 files changed, 89 insertions(+), 57 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index ea9c317b5916..2a475e83a092 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -212,7 +212,7 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
> f2fs_put_page(page, 0);
> }
> out:
> - f2fs_submit_merged_bio(sbi, META, READ);
> + f2fs_submit_meta_bio(sbi, META, READ);
> blk_finish_plug(&plug);
> return blkno - start;
> }
> @@ -249,13 +249,13 @@ static int f2fs_write_meta_page(struct page *page,
> dec_page_count(sbi, F2FS_DIRTY_META);
>
> if (wbc->for_reclaim)
> - f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
> + f2fs_submit_meta_bio_cond(sbi, page->mapping->host,
> 0, page->index, META, WRITE);
>
> unlock_page(page);
>
> if (unlikely(f2fs_cp_error(sbi)))
> - f2fs_submit_merged_bio(sbi, META, WRITE);
> + f2fs_submit_meta_bio(sbi, META, WRITE);
>
> return 0;
>
> @@ -358,7 +358,7 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
> }
> stop:
> if (nwritten)
> - f2fs_submit_merged_bio(sbi, type, WRITE);
> + f2fs_submit_meta_bio(sbi, type, WRITE);
>
> blk_finish_plug(&plug);
>
> @@ -906,7 +906,7 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
> * We should submit bio, since it exists several
> * wribacking dentry pages in the freeing inode.
> */
> - f2fs_submit_merged_bio(sbi, DATA, WRITE);
> + f2fs_submit_log_bio(sbi, DATA, WRITE);
> cond_resched();
> }
> goto retry;
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 7c0f6bdf817d..37d0896021c7 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -278,28 +278,27 @@ static bool __has_merged_page(struct f2fs_bio_info *io,
> return false;
> }
>
> -static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
> - nid_t ino, pgoff_t idx, enum page_type type)
> +static struct f2fs_bio_info *__get_bio_info(struct f2fs_sb_info *sbi, int rw,
> + enum page_type type, int seg_type)
> {
> enum page_type btype = PAGE_TYPE_OF_BIO(type);
> - struct f2fs_bio_info *io = &sbi->write_io[btype];
> - bool ret;
> + struct f2fs_bio_info *io;
>
> - down_read(&io->io_rwsem);
> - ret = __has_merged_page(io, inode, ino, idx);
> - up_read(&io->io_rwsem);
> - return ret;
> + if (btype == META) {
> + int io_type = is_read_io(rw) ? READ : WRITE;
> +
> + io = &sbi->meta_io[io_type];
> + } else {
> + io = &sbi->log_io[seg_type];
> + }
> +
> + return io;
> }
>
> -static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
> +static void __f2fs_submit_merged_bio(struct f2fs_bio_info *io,
> struct inode *inode, nid_t ino, pgoff_t idx,
> - enum page_type type, int rw)
> + enum page_type type)
> {
> - enum page_type btype = PAGE_TYPE_OF_BIO(type);
> - struct f2fs_bio_info *io;
> -
> - io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
> -
> down_write(&io->io_rwsem);
>
> if (!__has_merged_page(io, inode, ino, idx))
> @@ -310,7 +309,7 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
> io->fio.type = META_FLUSH;
> io->fio.op = REQ_OP_WRITE;
> io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC;
> - if (!test_opt(sbi, NOBARRIER))
> + if (!test_opt(io->sbi, NOBARRIER))
> io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
> }
> __submit_merged_bio(io);
> @@ -318,25 +317,45 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
> up_write(&io->io_rwsem);
> }
>
> -void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
> - int rw)
> +void f2fs_submit_log_bio_cond(struct f2fs_sb_info *sbi,
> + struct inode *inode, nid_t ino, pgoff_t idx,
> + enum page_type type, int rw)
> +{
> + bool is_data = (type == DATA);
> + int i = is_data ? CURSEG_HOT_DATA : CURSEG_HOT_NODE;
> + int max = is_data ? CURSEG_COLD_DATA : CURSEG_COLD_NODE;
> +
> + for (; i <= max; i++)
> + __f2fs_submit_merged_bio(&sbi->log_io[i],
> + inode, ino, idx, type);
> +}
> +
> +void f2fs_submit_log_bio(struct f2fs_sb_info *sbi,
> + enum page_type type, int rw)
> {
> - __f2fs_submit_merged_bio(sbi, NULL, 0, 0, type, rw);
> + f2fs_submit_log_bio_cond(sbi, NULL, 0, 0, type, rw);
> }
>
> -void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
> +void f2fs_submit_meta_bio_cond(struct f2fs_sb_info *sbi,
> struct inode *inode, nid_t ino, pgoff_t idx,
> enum page_type type, int rw)
> {
> - if (has_merged_page(sbi, inode, ino, idx, type))
> - __f2fs_submit_merged_bio(sbi, inode, ino, idx, type, rw);
> + int io_type = is_read_io(rw) ? READ : WRITE;
> +
> + __f2fs_submit_merged_bio(&sbi->meta_io[io_type], inode, ino, idx, type);
> +}
> +
> +void f2fs_submit_meta_bio(struct f2fs_sb_info *sbi,
> + enum page_type type, int rw)
> +{
> + f2fs_submit_meta_bio_cond(sbi, NULL, 0, 0, type, rw);
> }
>
> void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi)
> {
> - f2fs_submit_merged_bio(sbi, DATA, WRITE);
> - f2fs_submit_merged_bio(sbi, NODE, WRITE);
> - f2fs_submit_merged_bio(sbi, META, WRITE);
> + f2fs_submit_log_bio(sbi, DATA, WRITE);
> + f2fs_submit_log_bio(sbi, NODE, WRITE);
> + f2fs_submit_meta_bio(sbi, META, WRITE);
> }
>
> /*
> @@ -371,13 +390,12 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
> int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
> {
> struct f2fs_sb_info *sbi = fio->sbi;
> - enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
> struct f2fs_bio_info *io;
> bool is_read = is_read_io(fio->op);
> struct page *bio_page;
> int err = 0;
>
> - io = is_read ? &sbi->read_io : &sbi->write_io[btype];
> + io = __get_bio_info(sbi, fio->op, fio->type, fio->seg_type);
>
> if (fio->old_blkaddr != NEW_ADDR)
> verify_block_addr(sbi, fio->old_blkaddr);
> @@ -1513,7 +1531,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> ClearPageUptodate(page);
>
> if (wbc->for_reclaim) {
> - f2fs_submit_merged_bio_cond(sbi, inode, 0, page->index,
> + f2fs_submit_log_bio_cond(sbi, inode, 0, page->index,
> DATA, WRITE);
> clear_inode_flag(inode, FI_HOT_DATA);
> remove_dirty_inode(inode);
> @@ -1525,7 +1543,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> f2fs_balance_fs(sbi, need_balance_fs);
>
> if (unlikely(f2fs_cp_error(sbi))) {
> - f2fs_submit_merged_bio(sbi, DATA, WRITE);
> + f2fs_submit_log_bio(sbi, DATA, WRITE);
> submitted = NULL;
> }
>
> @@ -1684,7 +1702,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> mapping->writeback_index = done_index;
>
> if (last_idx != ULONG_MAX)
> - f2fs_submit_merged_bio_cond(F2FS_M_SB(mapping), mapping->host,
> + f2fs_submit_log_bio_cond(F2FS_M_SB(mapping), mapping->host,
> 0, last_idx, DATA, WRITE);
>
> return ret;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e26999a74522..4ab42749fd5f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -795,6 +795,7 @@ enum page_type {
> struct f2fs_io_info {
> struct f2fs_sb_info *sbi; /* f2fs_sb_info pointer */
> enum page_type type; /* contains DATA/NODE/META/META_FLUSH */
> + int seg_type; /* indicate current segment type */
> int op; /* contains REQ_OP_ */
> int op_flags; /* req_flag_bits */
> block_t new_blkaddr; /* new block address to be written */
> @@ -879,8 +880,8 @@ struct f2fs_sb_info {
> struct f2fs_sm_info *sm_info; /* segment manager */
>
> /* for bio operations */
> - struct f2fs_bio_info read_io; /* for read bios */
> - struct f2fs_bio_info write_io[NR_PAGE_TYPE]; /* for write bios */
> + struct f2fs_bio_info meta_io[2]; /* for meta bios */
> + struct f2fs_bio_info log_io[NR_CURSEG_TYPE]; /* for log bios */
> struct mutex wio_mutex[NODE + 1]; /* bio ordering for NODE/DATA */
> int write_io_size_bits; /* Write IO size bits */
> mempool_t *write_io_dummy; /* Dummy pages */
> @@ -2325,11 +2326,15 @@ void destroy_checkpoint_caches(void);
> /*
> * data.c
> */
> -void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
> - int rw);
> -void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
> +void f2fs_submit_log_bio_cond(struct f2fs_sb_info *sbi,
> struct inode *inode, nid_t ino, pgoff_t idx,
> enum page_type type, int rw);
> +void f2fs_submit_log_bio(struct f2fs_sb_info *sbi, enum page_type type, int rw);
> +void f2fs_submit_meta_bio_cond(struct f2fs_sb_info *sbi,
> + struct inode *inode, nid_t ino, pgoff_t idx,
> + enum page_type type, int rw);
> +void f2fs_submit_meta_bio(struct f2fs_sb_info *sbi,
> + enum page_type type, int rw);
> void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi);
> int f2fs_submit_page_bio(struct f2fs_io_info *fio);
> int f2fs_submit_page_mbio(struct f2fs_io_info *fio);
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 026522107ca3..8b267ca30926 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -586,6 +586,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx,
> struct f2fs_io_info fio = {
> .sbi = F2FS_I_SB(inode),
> .type = DATA,
> + .seg_type = CURSEG_COLD_DATA,
> .op = REQ_OP_READ,
> .op_flags = 0,
> .encrypted_page = NULL,
> @@ -632,7 +633,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx,
> fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
>
> allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
> - &sum, CURSEG_COLD_DATA);
> + &sum, fio.seg_type);
>
> fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr,
> FGP_LOCK | FGP_CREAT, GFP_NOFS);
> @@ -936,7 +937,7 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
> }
>
> if (gc_type == FG_GC)
> - f2fs_submit_merged_bio(sbi,
> + f2fs_submit_log_bio(sbi,
> (type == SUM_TYPE_NODE) ? NODE : DATA, WRITE);
>
> blk_finish_plug(&plug);
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 98351a4a4da3..28f6d1723327 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1373,7 +1373,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> up_read(&sbi->node_write);
>
> if (wbc->for_reclaim) {
> - f2fs_submit_merged_bio_cond(sbi, page->mapping->host, 0,
> + f2fs_submit_log_bio_cond(sbi, page->mapping->host, 0,
> page->index, NODE, WRITE);
> submitted = NULL;
> }
> @@ -1381,7 +1381,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> unlock_page(page);
>
> if (unlikely(f2fs_cp_error(sbi))) {
> - f2fs_submit_merged_bio(sbi, NODE, WRITE);
> + f2fs_submit_log_bio(sbi, NODE, WRITE);
> submitted = NULL;
> }
> if (submitted)
> @@ -1518,7 +1518,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> }
> out:
> if (last_idx != ULONG_MAX)
> - f2fs_submit_merged_bio_cond(sbi, NULL, ino, last_idx,
> + f2fs_submit_log_bio_cond(sbi, NULL, ino, last_idx,
> NODE, WRITE);
> return ret ? -EIO: 0;
> }
> @@ -1625,7 +1625,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
> }
> out:
> if (nwritten)
> - f2fs_submit_merged_bio(sbi, NODE, WRITE);
> + f2fs_submit_log_bio(sbi, NODE, WRITE);
> return ret;
> }
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index b084b3a8f2c7..cdf7d61ac213 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -328,7 +328,7 @@ static int __commit_inmem_pages(struct inode *inode,
> }
>
> if (last_idx != ULONG_MAX)
> - f2fs_submit_merged_bio_cond(sbi, inode, 0, last_idx,
> + f2fs_submit_log_bio_cond(sbi, inode, 0, last_idx,
> DATA, WRITE);
>
> if (!err)
> @@ -2141,14 +2141,15 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
>
> static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
> {
> - int type = __get_segment_type(fio->page, fio->type);
> int err;
>
> + fio->seg_type = __get_segment_type(fio->page, fio->type);
> +
> if (fio->type == NODE || fio->type == DATA)
> mutex_lock(&fio->sbi->wio_mutex[fio->type]);
> reallocate:
> allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
> - &fio->new_blkaddr, sum, type);
> + &fio->new_blkaddr, sum, fio->seg_type);
>
> /* writeout dirty page into bdev */
> err = f2fs_submit_page_mbio(fio);
> @@ -2297,8 +2298,13 @@ void f2fs_wait_on_page_writeback(struct page *page,
> if (PageWriteback(page)) {
> struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>
> - f2fs_submit_merged_bio_cond(sbi, page->mapping->host,
> + if (type == META)
> + f2fs_submit_meta_bio_cond(sbi, page->mapping->host,
> + 0, page->index, type, WRITE);
> + else
> + f2fs_submit_log_bio_cond(sbi, page->mapping->host,
> 0, page->index, type, WRITE);
> +
> if (ordered)
> wait_on_page_writeback(page);
> else
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 83355ec4a92c..fed25ca609e4 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1950,13 +1950,15 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> set_sbi_flag(sbi, SBI_POR_DOING);
> spin_lock_init(&sbi->stat_lock);
>
> - init_rwsem(&sbi->read_io.io_rwsem);
> - sbi->read_io.sbi = sbi;
> - sbi->read_io.bio = NULL;
> - for (i = 0; i < NR_PAGE_TYPE; i++) {
> - init_rwsem(&sbi->write_io[i].io_rwsem);
> - sbi->write_io[i].sbi = sbi;
> - sbi->write_io[i].bio = NULL;
> + for (i = 0; i < 2; i++) {
> + init_rwsem(&sbi->meta_io[i].io_rwsem);
> + sbi->meta_io[i].sbi = sbi;
> + sbi->meta_io[i].bio = NULL;
> + }
> + for (i = 0; i < NR_CURSEG_TYPE; i++) {
> + init_rwsem(&sbi->log_io[i].io_rwsem);
> + sbi->log_io[i].sbi = sbi;
> + sbi->log_io[i].bio = NULL;
> }
>
> init_rwsem(&sbi->cp_rwsem);
> --
> 2.12.2.510.ge1104a5ee539
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