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This patch introduces cache_wb_dirty_threshold and cache_wb_total_threshold
sysfs nodes under /sys/fs/f2fs/<disk>/, and wakes up the f2fs_writeback
kthread when dirty meta/node caches exceed cache_wb_dirty_threshold and
total cached entries exceed cache_wb_total_threshold; a zero threshold
disables the corresponding check. By default, cache_wb_dirty_threshold is
8192 and cache_wb_total_threshold is 0.
If both thresholds are zero, f2fs_writeback only runs periodically, unless
checkpoint is disabled, as nothing else will flush dirty caches then.
f2fs_writeback won't be woken up unless there are enough dirty caches for
f2fs_write_{meta,node}_caches() to gather. And if thresholds are exceeded
but one round fails to write any caches, e.g. due to cp_error, freezing,
frozen fs, or lock contention, threshold based wakeup is throttled until
a later round makes progress, in order to avoid busy-looping. To detect
progress, introduce a new parameter for f2fs_write_{meta,node}_caches()
and f2fs_writeback_node_caches() to return the number of caches submitted
for writeback.
Thanks Daeho and Wenjie for help and suggestion on this patch.
Suggested-by: Daeho Jeong <daehojeong@google.com>
Suggested-by: Wenjie Qi <qiwenjie@xiaomi.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Reviewed-by: Wenjie Qi <qiwenjie@xiaomi.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces META_BLOCK and NODE_BLOCK memory types to monitor
meta and node cache usage against available free memory, and integrates
them into f2fs_balance_fs_bg().
In f2fs_balance_fs_bg(), shrink 128 clean cached blocks of each types when
memory is insufficient (cache memory usage is larger than 50% of low memory).
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch exposes per-cache memory usage (entry struct memory vs.
cached block buffer memory) for meta, node, and compress caches under
the memory section in debugfs:
- meta entry: xxx KB, meta cache: xxx KB
- node entry: xxx KB, node cache: xxx KB
- compress entry: xxx KB, compress cache: xxx KB
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces compress_blocks in f2fs_sb_info structure, initializes
and destroys the compress cache during filesystem mount and unmount.
It adds an ino union field in struct f2fs_cached_block (sharing space
with writeback linkage for zero memory overhead) to track per-inode
cached blocks, and registers compress cache into the memory shrinker.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch migrates F2FS node block caching from the fake VFS inode
page cache (sbi->node_inode) to node cache (sbi->node_blocks).
It updates node related helpers to use node cache APIs and reference to
struct f2fs_cached_block, and removes sbi->node_inode, especially, unifies
inline and regular dentry block handling via struct f2fs_dentry_block_ref.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces node_blocks in f2fs_sb_info structure, initializes
and destroys the node cache during filesystem mount and unmount.
It also introduces helper wrappers for node cache operation, and registers
node cache into the memory shrinker and writeback kthread.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch migrates F2FS meta block caching from the fake VFS inode
page cache (sbi->meta_inode) to meta cache (sbi->meta_blocks).
It converts CP, SIT, NAT, SSA, recovery, and GC metadata I/O paths to
operate on struct f2fs_cached_block instead of folio, and removes
sbi->meta_inode.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces a background writeback kthread (f2fs_writeback-x:y)
to periodically flush dirty metadata cache entries with a default
interval of 5 seconds.
It manages thread lifecycle across mount, unmount, and remount (rw/ro)
transitions.
It introduces a sysfs entry /sys/fs/f2fs/<disk>/cache_wb_interval to control
writeback interval.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch integrates the metadata cache into the F2FS memory shrinker
subsystem to reclaim clean, unreferenced cached blocks under memory
pressure.
It implements f2fs_shrink_cache() using a 3-phase cache reclamin method:
1. isolate clean entries from lru list
2. truncate from radix tree under lock
3. splice un-reclaimed entries back
And hooks the new interface into f2fs_shrink_count() and f2fs_shrink_scan().
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces meta_blocks in f2fs_sb_info structure, initializes
and destroys the meta cache during filesystem mount and unmount.
It also introduces helper wrappers for meta cache operation.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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This patch introduces the core metadata block caching infrastructure to
manage f2fs metadata independently of the page cache.
It implements:
- core cache APIs: get, create, put, drop, backed by a radix tree and
a single global LRU list.
- support multiple status of cached block: LOCKED, UPTODATE, DIRTY,
WRITEBACK, INLINE.
- internal bio based read/write helpers with adjacent block vector merging.
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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