From: Chao Yu chao@kernel.org
[ Upstream commit 009a8241a8e5a14ea2dd0b8db42dbf283527dd44 ]
Quoted: "at this time, there are still 1086911 extent nodes in this zombie extent tree that need to be cleaned up.
crash_arm64_sprd_v8.0.3++> extent_tree.node_cnt ffffff80896cc500 node_cnt = { counter = 1086911 }, "
As reported by Xiuhong, there will be a huge number of extent nodes in extent tree, it may potentially cause: - slab memory fragments - extreme long time shrink on extent tree - low mapping efficiency
Let's add a sysfs node to limit max read extent count for each inode, by default, value of this threshold is 10240, it can be updated according to user's requirement.
Reported-by: Xiuhong Wang xiuhong.wang@unisoc.com Closes: https://lore.kernel.org/linux-f2fs-devel/20241112110627.1314632-1-xiuhong.wa... Signed-off-by: Xiuhong Wang xiuhong.wang@unisoc.com Signed-off-by: Zhiguo Niu zhiguo.niu@unisoc.com Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++ fs/f2fs/extent_cache.c | 5 ++++- fs/f2fs/f2fs.h | 4 ++++ fs/f2fs/sysfs.c | 10 ++++++++++ 4 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index fdedf1ea944ba..ccee0fd74dd66 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -819,3 +819,9 @@ Description: It controls the valid block ratio threshold not to trigger excessiv for zoned deivces. The initial value of it is 95(%). F2FS will stop the background GC thread from intiating GC for sections having valid blocks exceeding the ratio. + +What: /sys/fs/f2fs/<disk>/max_read_extent_count +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. diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index 368d9cbdea743..fb09c8e9bc573 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -674,7 +674,9 @@ static void __update_extent_tree_range(struct inode *inode, }
if (end < org_end && (type != EX_READ || - org_end - end >= F2FS_MIN_EXTENT_LEN)) { + (org_end - end >= F2FS_MIN_EXTENT_LEN && + atomic_read(&et->node_cnt) < + sbi->max_read_extent_count))) { if (parts) { __set_extent_info(&ei, end, org_end - end, @@ -1169,6 +1171,7 @@ void f2fs_init_extent_cache_info(struct f2fs_sb_info *sbi) sbi->hot_data_age_threshold = DEF_HOT_DATA_AGE_THRESHOLD; sbi->warm_data_age_threshold = DEF_WARM_DATA_AGE_THRESHOLD; sbi->last_age_weight = LAST_AGE_WEIGHT; + sbi->max_read_extent_count = DEF_MAX_READ_EXTENT_COUNT; }
int __init f2fs_create_extent_cache(void) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 33f5449dc22d5..928c10dc7ad58 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -634,6 +634,9 @@ enum { #define DEF_HOT_DATA_AGE_THRESHOLD 262144 #define DEF_WARM_DATA_AGE_THRESHOLD 2621440
+/* default max read extent count per inode */ +#define DEF_MAX_READ_EXTENT_COUNT 10240 + /* extent cache type */ enum extent_type { EX_READ, @@ -1619,6 +1622,7 @@ struct f2fs_sb_info { /* for extent tree cache */ struct extent_tree_info extent_tree[NR_EXTENT_CACHES]; atomic64_t allocated_data_blocks; /* for block age extent_cache */ + unsigned int max_read_extent_count; /* max read extent count per inode */
/* The threshold used for hot and warm data seperation*/ unsigned int hot_data_age_threshold; diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index c56e8c8739352..d9a44f03e558b 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -789,6 +789,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a, return count; }
+ if (!strcmp(a->attr.name, "max_read_extent_count")) { + if (t > UINT_MAX) + return -EINVAL; + *ui = (unsigned int)t; + return count; + } + if (!strcmp(a->attr.name, "ipu_policy")) { if (t >= BIT(F2FS_IPU_MAX)) return -EINVAL; @@ -1054,6 +1061,8 @@ F2FS_SBI_GENERAL_RW_ATTR(revoked_atomic_block); F2FS_SBI_GENERAL_RW_ATTR(hot_data_age_threshold); F2FS_SBI_GENERAL_RW_ATTR(warm_data_age_threshold); F2FS_SBI_GENERAL_RW_ATTR(last_age_weight); +/* read extent cache */ +F2FS_SBI_GENERAL_RW_ATTR(max_read_extent_count); #ifdef CONFIG_BLK_DEV_ZONED F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec); F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy); @@ -1244,6 +1253,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(hot_data_age_threshold), ATTR_LIST(warm_data_age_threshold), ATTR_LIST(last_age_weight), + ATTR_LIST(max_read_extent_count), NULL, }; ATTRIBUTE_GROUPS(f2fs);