[PATCH] f2fs: only flush the single temp bio cache which owns the target page

[PATCH] f2fs: only flush the single temp bio cache which owns the target page

[Yunlong Song]

Previously, when f2fs finds which temp bio cache owns the target page,
it will flush all the three temp bio caches, but we only need to flush
one single bio cache indeed, which can help to keep bio merged.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
---
 fs/f2fs/data.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 106f116..04ebbad 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -374,7 +374,7 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
 
 static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
 						struct page *page, nid_t ino,
-						enum page_type type)
+						enum page_type type, enum temp_type *owner)
 {
 	enum page_type btype = PAGE_TYPE_OF_BIO(type);
 	enum temp_type temp;
@@ -392,6 +392,10 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
 		if (ret || btype == META)
 			break;
 	}
+	if (!ret || (!inode && !page && !ino))
+		*owner = NR_TEMP_TYPE;
+	else
+		*owner = temp;
 	return ret;
 }
 
@@ -421,9 +425,14 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 {
 	enum temp_type temp;
 
-	if (!force && !has_merged_page(sbi, inode, page, ino, type))
+	if (!force && !has_merged_page(sbi, inode, page, ino, type, &temp))
 		return;
 
+	if (!force && temp != NR_TEMP_TYPE) {
+		__f2fs_submit_merged_write(sbi, type, temp);
+		return;
+	}
+
 	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 
 		__f2fs_submit_merged_write(sbi, type, temp);
-- 
1.8.5.2

Re: [PATCH] f2fs: only flush the single temp bio cache which owns the target page

[Chao Yu]

Hi Yunlong,

On 2018/10/24 16:10, Yunlong Song wrote:
> Previously, when f2fs finds which temp bio cache owns the target page,
> it will flush all the three temp bio caches, but we only need to flush
> one single bio cache indeed, which can help to keep bio merged.
> 
> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
> ---
>  fs/f2fs/data.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 106f116..04ebbad 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -374,7 +374,7 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
>  
>  static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
>  						struct page *page, nid_t ino,
> -						enum page_type type)
> +						enum page_type type, enum temp_type *owner)
>  {
>  	enum page_type btype = PAGE_TYPE_OF_BIO(type);
>  	enum temp_type temp;
> @@ -392,6 +392,10 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
>  		if (ret || btype == META)
>  			break;
>  	}
> +	if (!ret || (!inode && !page && !ino))
> +		*owner = NR_TEMP_TYPE;
> +	else
> +		*owner = temp;
>  	return ret;
>  }
>  
> @@ -421,9 +425,14 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
>  {
>  	enum temp_type temp;
>  
> -	if (!force && !has_merged_page(sbi, inode, page, ino, type))
> +	if (!force && !has_merged_page(sbi, inode, page, ino, type, &temp))
>  		return;
>  
> +	if (!force && temp != NR_TEMP_TYPE) {
> +		__f2fs_submit_merged_write(sbi, type, temp);

I think we need to add has_merged_page into __f2fs_submit_merged_write to
check whether we should submit bio from different log, otherwise we will
missed to submit bio in below condition:

- f2fs_write_cache_pages
 - add page into bio cache of cold log
 - add page into bio cache of warm log
 - f2fs_submit_merged_write_cond(inode)
   - __f2fs_submit_merged_write(warm) -- missed to submit bio of cold log

Thanks,

> +		return;
> +	}
> +
>  	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
>  
>  		__f2fs_submit_merged_write(sbi, type, temp);
> 

[PATCH v2] f2fs: only flush the single temp bio cache which owns the target page

[Yunlong Song]

Previously, when f2fs finds which temp bio cache owns the target page,
it will flush all the three temp bio caches, but we only need to flush
one single bio cache indeed, which can help to keep bio merged.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
---
 fs/f2fs/data.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 106f116..882e217 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -396,13 +396,17 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
 }
 
 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
-				enum page_type type, enum temp_type temp)
+				struct inode *inode, struct page *page, nid_t ino,
+				enum page_type type, enum temp_type temp, bool force)
 {
 	enum page_type btype = PAGE_TYPE_OF_BIO(type);
 	struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 
 	down_write(&io->io_rwsem);
 
+	if (!force && !__has_merged_page(io, inode, page, ino))
+		goto out;
+
 	/* change META to META_FLUSH in the checkpoint procedure */
 	if (type >= META_FLUSH) {
 		io->fio.type = META_FLUSH;
@@ -412,6 +416,7 @@ static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
 			io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
 	}
 	__submit_merged_bio(io);
+out:
 	up_write(&io->io_rwsem);
 }
 
@@ -426,7 +431,7 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 
 	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
 
-		__f2fs_submit_merged_write(sbi, type, temp);
+		__f2fs_submit_merged_write(sbi, inode, page, ino, type, temp, force);
 
 		/* TODO: use HOT temp only for meta pages now. */
 		if (type >= META)
-- 
1.8.5.2

Re: [PATCH v2] f2fs: only flush the single temp bio cache which owns the target page

[Chao Yu]

On 2018/10/24 19:35, Yunlong Song wrote:
> Previously, when f2fs finds which temp bio cache owns the target page,
> it will flush all the three temp bio caches, but we only need to flush
> one single bio cache indeed, which can help to keep bio merged.
> 
> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

Re: [PATCH v2] f2fs: only flush the single temp bio cache which owns the target page

[Jaegeuk Kim]

On 10/24, Yunlong Song wrote:
> Previously, when f2fs finds which temp bio cache owns the target page,
> it will flush all the three temp bio caches, but we only need to flush
> one single bio cache indeed, which can help to keep bio merged.
> 
> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
> ---
>  fs/f2fs/data.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 106f116..882e217 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -396,13 +396,17 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
>  }
>  
>  static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
> -				enum page_type type, enum temp_type temp)
> +				struct inode *inode, struct page *page, nid_t ino,
> +				enum page_type type, enum temp_type temp, bool force)
>  {
>  	enum page_type btype = PAGE_TYPE_OF_BIO(type);
>  	struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
>  
>  	down_write(&io->io_rwsem);
>  
> +	if (!force && !__has_merged_page(io, inode, page, ino))
> +		goto out;

Could you clean up this to call once in __submit_merged_write_cond() only?

> +
>  	/* change META to META_FLUSH in the checkpoint procedure */
>  	if (type >= META_FLUSH) {
>  		io->fio.type = META_FLUSH;
> @@ -412,6 +416,7 @@ static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
>  			io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
>  	}
>  	__submit_merged_bio(io);
> +out:
>  	up_write(&io->io_rwsem);
>  }
>  
> @@ -426,7 +431,7 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
>  
>  	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
>  
> -		__f2fs_submit_merged_write(sbi, type, temp);
> +		__f2fs_submit_merged_write(sbi, inode, page, ino, type, temp, force);
>  
>  		/* TODO: use HOT temp only for meta pages now. */
>  		if (type >= META)
> -- 
> 1.8.5.2

[PATCH v3] f2fs: only flush the single temp bio cache which owns the target page

[Yunlong Song]

Previously, when f2fs finds which temp bio cache owns the target page,
it will flush all the three temp bio caches, but we only need to flush
one single bio cache indeed, which can help to keep bio merged.

Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
---
 fs/f2fs/data.c | 37 ++++++++++---------------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 6e0ffb1..cd8f670 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -372,29 +372,6 @@ static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
 	return false;
 }
 
-static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
-						struct page *page, nid_t ino,
-						enum page_type type)
-{
-	enum page_type btype = PAGE_TYPE_OF_BIO(type);
-	enum temp_type temp;
-	struct f2fs_bio_info *io;
-	bool ret = false;
-
-	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
-		io = sbi->write_io[btype] + temp;
-
-		down_read(&io->io_rwsem);
-		ret = __has_merged_page(io, inode, page, ino);
-		up_read(&io->io_rwsem);
-
-		/* TODO: use HOT temp only for meta pages now. */
-		if (ret || btype == META)
-			break;
-	}
-	return ret;
-}
-
 static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
 				enum page_type type, enum temp_type temp)
 {
@@ -420,13 +397,19 @@ static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
 				nid_t ino, enum page_type type, bool force)
 {
 	enum temp_type temp;
-
-	if (!force && !has_merged_page(sbi, inode, page, ino, type))
-		return;
+	bool ret = true;
 
 	for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
+		if (!force)	{
+			enum page_type btype = PAGE_TYPE_OF_BIO(type);
+			struct f2fs_bio_info *io = sbi->write_io[btype] + temp;
 
-		__f2fs_submit_merged_write(sbi, type, temp);
+			down_read(&io->io_rwsem);
+			ret = __has_merged_page(io, inode, page, ino);
+			up_read(&io->io_rwsem);
+		}
+		if (ret)
+			__f2fs_submit_merged_write(sbi, type, temp);
 
 		/* TODO: use HOT temp only for meta pages now. */
 		if (type >= META)
-- 
1.8.5.2

Re: [PATCH v3] f2fs: only flush the single temp bio cache which owns the target page

[Chao Yu]

On 2018/11/13 11:57, Yunlong Song wrote:
> Previously, when f2fs finds which temp bio cache owns the target page,
> it will flush all the three temp bio caches, but we only need to flush
> one single bio cache indeed, which can help to keep bio merged.
> 
> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,