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 1024 > /sys/fs/f2fs/blk/reclaim_caches_kb
will reclaim 4MB page cache ranges, registered by #1, #2, and #3.
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 7 ++++++
fs/f2fs/f2fs.h | 2 ++
fs/f2fs/shrinker.c | 33 +++++++++++++++++++++++++
fs/f2fs/sysfs.c | 8 ++++++
4 files changed, 50 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs
b/Documentation/ABI/testing/sysfs-fs-f2fs
index 3e1630c70d8a..0455d06a4b27 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" <c...@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>/reclaim_caches_kb
+Date: December 2024
+Contact: "Jaegeuk Kim" <jaeg...@kernel.org>
+Description: It reclaims the given KBs of file-backed pages registered by
+ ioctl(F2FS_IOC_DONATE_RANGE).
+ For example, writing N tries to drop N KBs spaces in LRU.
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9bed1a3a60fb..62b7fed1514a 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 reclaim_caches_kb;
/* 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_reclaim_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..759a6e8a49c0 100644
--- a/fs/f2fs/shrinker.c
+++ b/fs/f2fs/shrinker.c
@@ -130,6 +130,39 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink,
return freed;
}
+void f2fs_reclaim_caches(struct f2fs_sb_info *sbi)
+{
+ struct inode *inode;
+ struct f2fs_inode_info *fi;
+ unsigned int nfiles = sbi->donate_files;
+ pgoff_t npages = sbi->reclaim_caches_kb >> (PAGE_SHIFT - 10);
+
+ while (npages && nfiles--) {
+ pgoff_t len;
+
+ 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;
+
+ len = fi->donate_end - fi->donate_start + 1;
+ npages = npages < len ? 0 : npages - len;
+ invalidate_inode_pages2_range(inode->i_mapping,
+ fi->donate_start, fi->donate_end);
+ iput(inode);
+ cond_resched();
+ }
+}
+
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 d15c68b28952..d11726aaf5ae 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, "reclaim_caches_kb")) {
+ sbi->reclaim_caches_kb = t;
+ f2fs_reclaim_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(reclaim_caches_kb);
#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(reclaim_caches_kb),
ATTR_LIST(ram_thresh),
ATTR_LIST(ra_nid_pages),
ATTR_LIST(dirty_nats_ratio),
--
2.48.1.262.g85cc9f2d1e-goog
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