6.12-stable review patch. If anyone has any objections, please let me know.
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From: Jaegeuk Kim jaegeuk@kernel.org
[ Upstream commit a907f3a68ee26ba493a08a958809208d17f3347e ]
1. fadvise(fd1, POSIX_FADV_NOREUSE, {0,3}); 2. fadvise(fd2, POSIX_FADV_NOREUSE, {1,2}); 3. fadvise(fd3, POSIX_FADV_NOREUSE, {3,1}); 4. echo 1024 > /sys/fs/f2fs/tuning/reclaim_caches_kb
This gives a way to reclaim file-backed pages by iterating all f2fs mounts until reclaiming 1MB page cache ranges, registered by #1, #2, and #3.
5. cat /sys/fs/f2fs/tuning/reclaim_caches_kb -> gives total number of registered file ranges.
Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Stable-dep-of: e462fc48ceb8 ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle") Signed-off-by: Sasha Levin sashal@kernel.org --- Documentation/ABI/testing/sysfs-fs-f2fs | 7 ++ fs/f2fs/f2fs.h | 2 + fs/f2fs/shrinker.c | 90 +++++++++++++++++++++++++ fs/f2fs/sysfs.c | 63 +++++++++++++++++ 4 files changed, 162 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 3e1630c70d8ae..81deae2af84d2 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/tuning/reclaim_caches_kb +Date: February 2025 +Contact: "Jaegeuk Kim" jaegeuk@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 7ced2e2c65746..f2f3e02b6fd4c 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -4271,6 +4271,8 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink, struct shrink_control *sc); unsigned long f2fs_shrink_scan(struct shrinker *shrink, struct shrink_control *sc); +unsigned int f2fs_donate_files(void); +void f2fs_reclaim_caches(unsigned int reclaim_caches_kb); 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 83d6fb97dcae0..45efff635d8e4 100644 --- a/fs/f2fs/shrinker.c +++ b/fs/f2fs/shrinker.c @@ -130,6 +130,96 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink, return freed; }
+unsigned int f2fs_donate_files(void) +{ + struct f2fs_sb_info *sbi; + struct list_head *p; + unsigned int donate_files = 0; + + spin_lock(&f2fs_list_lock); + p = f2fs_list.next; + while (p != &f2fs_list) { + sbi = list_entry(p, struct f2fs_sb_info, s_list); + + /* stop f2fs_put_super */ + if (!mutex_trylock(&sbi->umount_mutex)) { + p = p->next; + continue; + } + spin_unlock(&f2fs_list_lock); + + donate_files += sbi->donate_files; + + spin_lock(&f2fs_list_lock); + p = p->next; + mutex_unlock(&sbi->umount_mutex); + } + spin_unlock(&f2fs_list_lock); + + return donate_files; +} + +static unsigned int do_reclaim_caches(struct f2fs_sb_info *sbi, + unsigned int reclaim_caches_kb) +{ + struct inode *inode; + struct f2fs_inode_info *fi; + unsigned int nfiles = sbi->donate_files; + pgoff_t npages = 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(); + } + return npages << (PAGE_SHIFT - 10); +} + +void f2fs_reclaim_caches(unsigned int reclaim_caches_kb) +{ + struct f2fs_sb_info *sbi; + struct list_head *p; + + spin_lock(&f2fs_list_lock); + p = f2fs_list.next; + while (p != &f2fs_list && reclaim_caches_kb) { + sbi = list_entry(p, struct f2fs_sb_info, s_list); + + /* stop f2fs_put_super */ + if (!mutex_trylock(&sbi->umount_mutex)) { + p = p->next; + continue; + } + spin_unlock(&f2fs_list_lock); + + reclaim_caches_kb = do_reclaim_caches(sbi, reclaim_caches_kb); + + spin_lock(&f2fs_list_lock); + p = p->next; + mutex_unlock(&sbi->umount_mutex); + } + spin_unlock(&f2fs_list_lock); +} + 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 b3c04ecc3a271..5c4fd0f3acab7 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -939,6 +939,39 @@ static struct f2fs_base_attr f2fs_base_attr_##_name = { \ .show = f2fs_feature_show, \ }
+static ssize_t f2fs_tune_show(struct f2fs_base_attr *a, char *buf) +{ + unsigned int res = 0; + + if (!strcmp(a->attr.name, "reclaim_caches_kb")) + res = f2fs_donate_files(); + + return sysfs_emit(buf, "%u\n", res); +} + +static ssize_t f2fs_tune_store(struct f2fs_base_attr *a, + const char *buf, size_t count) +{ + unsigned long t; + int ret; + + ret = kstrtoul(skip_spaces(buf), 0, &t); + if (ret) + return ret; + + if (!strcmp(a->attr.name, "reclaim_caches_kb")) + f2fs_reclaim_caches(t); + + return count; +} + +#define F2FS_TUNE_RW_ATTR(_name) \ +static struct f2fs_base_attr f2fs_base_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = 0644 }, \ + .show = f2fs_tune_show, \ + .store = f2fs_tune_store, \ +} + static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a, struct f2fs_sb_info *sbi, char *buf) { @@ -1389,6 +1422,14 @@ static struct attribute *f2fs_sb_feat_attrs[] = { }; ATTRIBUTE_GROUPS(f2fs_sb_feat);
+F2FS_TUNE_RW_ATTR(reclaim_caches_kb); + +static struct attribute *f2fs_tune_attrs[] = { + BASE_ATTR_LIST(reclaim_caches_kb), + NULL, +}; +ATTRIBUTE_GROUPS(f2fs_tune); + static const struct sysfs_ops f2fs_attr_ops = { .show = f2fs_attr_show, .store = f2fs_attr_store, @@ -1422,6 +1463,20 @@ static struct kobject f2fs_feat = { .kset = &f2fs_kset, };
+static const struct sysfs_ops f2fs_tune_attr_ops = { + .show = f2fs_base_attr_show, + .store = f2fs_base_attr_store, +}; + +static const struct kobj_type f2fs_tune_ktype = { + .default_groups = f2fs_tune_groups, + .sysfs_ops = &f2fs_tune_attr_ops, +}; + +static struct kobject f2fs_tune = { + .kset = &f2fs_kset, +}; + static ssize_t f2fs_stat_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { @@ -1660,6 +1715,11 @@ int __init f2fs_init_sysfs(void) if (ret) goto put_kobject;
+ ret = kobject_init_and_add(&f2fs_tune, &f2fs_tune_ktype, + NULL, "tuning"); + if (ret) + goto put_kobject; + f2fs_proc_root = proc_mkdir("fs/f2fs", NULL); if (!f2fs_proc_root) { ret = -ENOMEM; @@ -1667,7 +1727,9 @@ int __init f2fs_init_sysfs(void) }
return 0; + put_kobject: + kobject_put(&f2fs_tune); kobject_put(&f2fs_feat); kset_unregister(&f2fs_kset); return ret; @@ -1675,6 +1737,7 @@ int __init f2fs_init_sysfs(void)
void f2fs_exit_sysfs(void) { + kobject_put(&f2fs_tune); kobject_put(&f2fs_feat); kset_unregister(&f2fs_kset); remove_proc_entry("fs/f2fs", NULL);