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[PATCH 2/2] f2fs: add a sysfs entry to request donate file-backed pages

Jaegeuk Kim posted 2 patches 2 weeks, 6 days ago
There is a newer version of this series
[PATCH 2/2] f2fs: add a sysfs entry to request donate file-backed pages
Posted by Jaegeuk Kim 2 weeks, 6 days ago 
1. ioctl(fd1, F2FS_IOC_DONATE_RANGE, {0,3});
2. ioctl(fd2, F2FS_IOC_DONATE_RANGE, {1,2});
3. ioctl(fd3, F2FS_IOC_DONATE_RANGE, {3,1});
4. echo 3 > /sys/fs/f2fs/blk/donate_caches

will reclaim 3 page cache ranges, registered by #1, #2, and #3.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 Documentation/ABI/testing/sysfs-fs-f2fs |  7 +++++++
 fs/f2fs/f2fs.h                          |  2 ++
 fs/f2fs/shrinker.c                      | 27 +++++++++++++++++++++++++
 fs/f2fs/sysfs.c                         |  8 ++++++++
 4 files changed, 44 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 3e1630c70d8a..6f9d8b8889fd 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -828,3 +828,10 @@ Date:		November 2024
 Contact:	"Chao Yu" <chao@kernel.org>
 Description:	It controls max read extent count for per-inode, the value of threshold
 		is 10240 by default.
+
+What:		/sys/fs/f2fs/<disk>/donate_caches
+Date:		December 2024
+Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
+Description:	It reclaims the certian file-backed pages registered by
+		ioctl(F2FS_IOC_DONATE_RANGE).
+		For example, writing N tries to drop N address spaces in LRU.
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 951fbc3f94c7..399ddd10a94f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1637,6 +1637,7 @@ struct f2fs_sb_info {
 
 	/* control donate caches */
 	unsigned int donate_files;
+	unsigned int donate_caches;
 
 	/* basic filesystem units */
 	unsigned int log_sectors_per_block;	/* log2 sectors per block */
@@ -4259,6 +4260,7 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink,
 			struct shrink_control *sc);
 unsigned long f2fs_shrink_scan(struct shrinker *shrink,
 			struct shrink_control *sc);
+void f2fs_donate_caches(struct f2fs_sb_info *sbi);
 void f2fs_join_shrinker(struct f2fs_sb_info *sbi);
 void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
 
diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
index 83d6fb97dcae..22f62813910b 100644
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -130,6 +130,33 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink,
 	return freed;
 }
 
+void f2fs_donate_caches(struct f2fs_sb_info *sbi)
+{
+	struct inode *inode;
+	struct f2fs_inode_info *fi;
+	int nfiles = sbi->donate_caches;
+
+	while (nfiles--) {
+		spin_lock(&sbi->inode_lock[DONATE_INODE]);
+		if (list_empty(&sbi->inode_list[DONATE_INODE])) {
+			spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+			break;
+		}
+		fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
+					struct f2fs_inode_info, gdonate_list);
+		list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]);
+		inode = igrab(&fi->vfs_inode);
+		spin_unlock(&sbi->inode_lock[DONATE_INODE]);
+
+		if (!inode)
+			continue;
+
+		invalidate_inode_pages2_range(inode->i_mapping,
+					fi->donate_start, fi->donate_end);
+		iput(inode);
+	}
+}
+
 void f2fs_join_shrinker(struct f2fs_sb_info *sbi)
 {
 	spin_lock(&f2fs_list_lock);
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 6b99dc49f776..f81190fabdd3 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -811,6 +811,12 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
 		return count;
 	}
 
+	if (!strcmp(a->attr.name, "donate_caches")) {
+		sbi->donate_caches = min(t, sbi->donate_files);
+		f2fs_donate_caches(sbi);
+		return count;
+	}
+
 	*ui = (unsigned int)t;
 
 	return count;
@@ -1030,6 +1036,7 @@ F2FS_SBI_GENERAL_RW_ATTR(max_victim_search);
 F2FS_SBI_GENERAL_RW_ATTR(migration_granularity);
 F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity);
 F2FS_SBI_GENERAL_RW_ATTR(dir_level);
+F2FS_SBI_GENERAL_RW_ATTR(donate_caches);
 #ifdef CONFIG_F2FS_IOSTAT
 F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
 F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms);
@@ -1178,6 +1185,7 @@ static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(migration_granularity),
 	ATTR_LIST(migration_window_granularity),
 	ATTR_LIST(dir_level),
+	ATTR_LIST(donate_caches),
 	ATTR_LIST(ram_thresh),
 	ATTR_LIST(ra_nid_pages),
 	ATTR_LIST(dirty_nats_ratio),
-- 
2.48.0.rc2.279.g1de40edade-goog
Re: [f2fs-dev] [PATCH 2/2] f2fs: add a sysfs entry to request donate file-backed pages
Posted by Chao Yu 2 weeks, 6 days ago 
On 1/16/25 06:16, Jaegeuk Kim via Linux-f2fs-devel wrote:
> 1. ioctl(fd1, F2FS_IOC_DONATE_RANGE, {0,3});
> 2. ioctl(fd2, F2FS_IOC_DONATE_RANGE, {1,2});
> 3. ioctl(fd3, F2FS_IOC_DONATE_RANGE, {3,1});
> 4. echo 3 > /sys/fs/f2fs/blk/donate_caches
> 
> will reclaim 3 page cache ranges, registered by #1, #2, and #3.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>   Documentation/ABI/testing/sysfs-fs-f2fs |  7 +++++++
>   fs/f2fs/f2fs.h                          |  2 ++
>   fs/f2fs/shrinker.c                      | 27 +++++++++++++++++++++++++
>   fs/f2fs/sysfs.c                         |  8 ++++++++
>   4 files changed, 44 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 3e1630c70d8a..6f9d8b8889fd 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -828,3 +828,10 @@ Date:		November 2024
>   Contact:	"Chao Yu" <chao@kernel.org>
>   Description:	It controls max read extent count for per-inode, the value of threshold
>   		is 10240 by default.
> +
> +What:		/sys/fs/f2fs/<disk>/donate_caches
> +Date:		December 2024
> +Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
> +Description:	It reclaims the certian file-backed pages registered by
> +		ioctl(F2FS_IOC_DONATE_RANGE).
> +		For example, writing N tries to drop N address spaces in LRU.
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 951fbc3f94c7..399ddd10a94f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1637,6 +1637,7 @@ struct f2fs_sb_info {
>   
>   	/* control donate caches */
>   	unsigned int donate_files;
> +	unsigned int donate_caches;
>   
>   	/* basic filesystem units */
>   	unsigned int log_sectors_per_block;	/* log2 sectors per block */
> @@ -4259,6 +4260,7 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink,
>   			struct shrink_control *sc);
>   unsigned long f2fs_shrink_scan(struct shrinker *shrink,
>   			struct shrink_control *sc);
> +void f2fs_donate_caches(struct f2fs_sb_info *sbi);
>   void f2fs_join_shrinker(struct f2fs_sb_info *sbi);
>   void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
>   
> diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
> index 83d6fb97dcae..22f62813910b 100644
> --- a/fs/f2fs/shrinker.c
> +++ b/fs/f2fs/shrinker.c
> @@ -130,6 +130,33 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink,
>   	return freed;
>   }
>   
> +void f2fs_donate_caches(struct f2fs_sb_info *sbi)
> +{
> +	struct inode *inode;
> +	struct f2fs_inode_info *fi;
> +	int nfiles = sbi->donate_caches;
> +
> +	while (nfiles--) {
> +		spin_lock(&sbi->inode_lock[DONATE_INODE]);
> +		if (list_empty(&sbi->inode_list[DONATE_INODE])) {
> +			spin_unlock(&sbi->inode_lock[DONATE_INODE]);
> +			break;
> +		}
> +		fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
> +					struct f2fs_inode_info, gdonate_list);
> +		list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]);
> +		inode = igrab(&fi->vfs_inode);
> +		spin_unlock(&sbi->inode_lock[DONATE_INODE]);
> +
> +		if (!inode)
> +			continue;
> +
> +		invalidate_inode_pages2_range(inode->i_mapping,
> +					fi->donate_start, fi->donate_end);

fi->donate_start and fi->donate_end can be updated in ioctl concurrently and 
become inconsistent here, is it fine?

Thanks,

> +		iput(inode);
> +	}
> +}
> +
>   void f2fs_join_shrinker(struct f2fs_sb_info *sbi)
>   {
>   	spin_lock(&f2fs_list_lock);
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 6b99dc49f776..f81190fabdd3 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -811,6 +811,12 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>   		return count;
>   	}
>   
> +	if (!strcmp(a->attr.name, "donate_caches")) {
> +		sbi->donate_caches = min(t, sbi->donate_files);
> +		f2fs_donate_caches(sbi);
> +		return count;
> +	}
> +
>   	*ui = (unsigned int)t;
>   
>   	return count;
> @@ -1030,6 +1036,7 @@ F2FS_SBI_GENERAL_RW_ATTR(max_victim_search);
>   F2FS_SBI_GENERAL_RW_ATTR(migration_granularity);
>   F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity);
>   F2FS_SBI_GENERAL_RW_ATTR(dir_level);
> +F2FS_SBI_GENERAL_RW_ATTR(donate_caches);
>   #ifdef CONFIG_F2FS_IOSTAT
>   F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
>   F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms);
> @@ -1178,6 +1185,7 @@ static struct attribute *f2fs_attrs[] = {
>   	ATTR_LIST(migration_granularity),
>   	ATTR_LIST(migration_window_granularity),
>   	ATTR_LIST(dir_level),
> +	ATTR_LIST(donate_caches),
>   	ATTR_LIST(ram_thresh),
>   	ATTR_LIST(ra_nid_pages),
>   	ATTR_LIST(dirty_nats_ratio),
Re: [f2fs-dev] [PATCH 2/2] f2fs: add a sysfs entry to request donate file-backed pages
Posted by Jaegeuk Kim 2 weeks, 6 days ago 
On 01/16, Chao Yu wrote:
> On 1/16/25 06:16, Jaegeuk Kim via Linux-f2fs-devel wrote:
> > 1. ioctl(fd1, F2FS_IOC_DONATE_RANGE, {0,3});
> > 2. ioctl(fd2, F2FS_IOC_DONATE_RANGE, {1,2});
> > 3. ioctl(fd3, F2FS_IOC_DONATE_RANGE, {3,1});
> > 4. echo 3 > /sys/fs/f2fs/blk/donate_caches
> > 
> > will reclaim 3 page cache ranges, registered by #1, #2, and #3.
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> >   Documentation/ABI/testing/sysfs-fs-f2fs |  7 +++++++
> >   fs/f2fs/f2fs.h                          |  2 ++
> >   fs/f2fs/shrinker.c                      | 27 +++++++++++++++++++++++++
> >   fs/f2fs/sysfs.c                         |  8 ++++++++
> >   4 files changed, 44 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> > index 3e1630c70d8a..6f9d8b8889fd 100644
> > --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> > +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> > @@ -828,3 +828,10 @@ Date:		November 2024
> >   Contact:	"Chao Yu" <chao@kernel.org>
> >   Description:	It controls max read extent count for per-inode, the value of threshold
> >   		is 10240 by default.
> > +
> > +What:		/sys/fs/f2fs/<disk>/donate_caches
> > +Date:		December 2024
> > +Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
> > +Description:	It reclaims the certian file-backed pages registered by
> > +		ioctl(F2FS_IOC_DONATE_RANGE).
> > +		For example, writing N tries to drop N address spaces in LRU.
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 951fbc3f94c7..399ddd10a94f 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1637,6 +1637,7 @@ struct f2fs_sb_info {
> >   	/* control donate caches */
> >   	unsigned int donate_files;
> > +	unsigned int donate_caches;
> >   	/* basic filesystem units */
> >   	unsigned int log_sectors_per_block;	/* log2 sectors per block */
> > @@ -4259,6 +4260,7 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink,
> >   			struct shrink_control *sc);
> >   unsigned long f2fs_shrink_scan(struct shrinker *shrink,
> >   			struct shrink_control *sc);
> > +void f2fs_donate_caches(struct f2fs_sb_info *sbi);
> >   void f2fs_join_shrinker(struct f2fs_sb_info *sbi);
> >   void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
> > diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c
> > index 83d6fb97dcae..22f62813910b 100644
> > --- a/fs/f2fs/shrinker.c
> > +++ b/fs/f2fs/shrinker.c
> > @@ -130,6 +130,33 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink,
> >   	return freed;
> >   }
> > +void f2fs_donate_caches(struct f2fs_sb_info *sbi)
> > +{
> > +	struct inode *inode;
> > +	struct f2fs_inode_info *fi;
> > +	int nfiles = sbi->donate_caches;
> > +
> > +	while (nfiles--) {
> > +		spin_lock(&sbi->inode_lock[DONATE_INODE]);
> > +		if (list_empty(&sbi->inode_list[DONATE_INODE])) {
> > +			spin_unlock(&sbi->inode_lock[DONATE_INODE]);
> > +			break;
> > +		}
> > +		fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
> > +					struct f2fs_inode_info, gdonate_list);
> > +		list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]);
> > +		inode = igrab(&fi->vfs_inode);
> > +		spin_unlock(&sbi->inode_lock[DONATE_INODE]);
> > +
> > +		if (!inode)
> > +			continue;
> > +
> > +		invalidate_inode_pages2_range(inode->i_mapping,
> > +					fi->donate_start, fi->donate_end);
> 
> fi->donate_start and fi->donate_end can be updated in ioctl concurrently and
> become inconsistent here, is it fine?

I think that needs to be managed by user, as there'll be no frequent updates to
the donate ranges.

> 
> Thanks,
> 
> > +		iput(inode);
> > +	}
> > +}
> > +
> >   void f2fs_join_shrinker(struct f2fs_sb_info *sbi)
> >   {
> >   	spin_lock(&f2fs_list_lock);
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index 6b99dc49f776..f81190fabdd3 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -811,6 +811,12 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> >   		return count;
> >   	}
> > +	if (!strcmp(a->attr.name, "donate_caches")) {
> > +		sbi->donate_caches = min(t, sbi->donate_files);
> > +		f2fs_donate_caches(sbi);
> > +		return count;
> > +	}
> > +
> >   	*ui = (unsigned int)t;
> >   	return count;
> > @@ -1030,6 +1036,7 @@ F2FS_SBI_GENERAL_RW_ATTR(max_victim_search);
> >   F2FS_SBI_GENERAL_RW_ATTR(migration_granularity);
> >   F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity);
> >   F2FS_SBI_GENERAL_RW_ATTR(dir_level);
> > +F2FS_SBI_GENERAL_RW_ATTR(donate_caches);
> >   #ifdef CONFIG_F2FS_IOSTAT
> >   F2FS_SBI_GENERAL_RW_ATTR(iostat_enable);
> >   F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms);
> > @@ -1178,6 +1185,7 @@ static struct attribute *f2fs_attrs[] = {
> >   	ATTR_LIST(migration_granularity),
> >   	ATTR_LIST(migration_window_granularity),
> >   	ATTR_LIST(dir_level),
> > +	ATTR_LIST(donate_caches),
> >   	ATTR_LIST(ram_thresh),
> >   	ATTR_LIST(ra_nid_pages),
> >   	ATTR_LIST(dirty_nats_ratio),

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