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| author | Christian Brauner <brauner@kernel.org> | 2025-10-29 17:54:36 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-10-29 17:54:36 +0300 |
| commit | 891bea757c771dca47e871444faecb1ed642a311 (patch) | |
| tree | eb814e06688a4d12c06424a60d497738b5a47c73 /include/linux | |
| parent | 211c43d0938dd57c2937366339f8b651e7990d1a (diff) | |
| parent | 015a54407782309c11655e1938bcbcef131ebf87 (diff) | |
| download | linux-891bea757c771dca47e871444faecb1ed642a311.tar.xz | |
Merge patch series "allow file systems to increase the minimum writeback chunk size v2"
Christoph Hellwig <hch@lst.de> says:
The relatively low minimal writeback size of 4MiB leads means that
written back inodes on rotational media are switched a lot. Besides
introducing additional seeks, this also can lead to extreme file
fragmentation on zoned devices when a lot of files are cached relative
to the available writeback bandwidth.
Add a superblock field that allows the file system to override the
default size, and set it to the zone size for zoned XFS.
* patches from https://patch.msgid.link/20251017034611.651385-1-hch@lst.de:
xfs: set s_min_writeback_pages for zoned file systems
writeback: allow the file system to override MIN_WRITEBACK_PAGES
writeback: cleanup writeback_chunk_size
Link: https://patch.msgid.link/20251017034611.651385-1-hch@lst.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/fs.h | 1 | ||||
| -rw-r--r-- | include/linux/writeback.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index a5dbfa20f8d7..6bf369095d2e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1583,6 +1583,7 @@ struct super_block { spinlock_t s_inode_wblist_lock; struct list_head s_inodes_wb; /* writeback inodes */ + long s_min_writeback_pages; } __randomize_layout; static inline struct user_namespace *i_user_ns(const struct inode *inode) diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 22dd4adc5667..49e1dd96f43e 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -374,4 +374,9 @@ bool redirty_page_for_writepage(struct writeback_control *, struct page *); void sb_mark_inode_writeback(struct inode *inode); void sb_clear_inode_writeback(struct inode *inode); +/* + * 4MB minimal write chunk size + */ +#define MIN_WRITEBACK_PAGES (4096UL >> (PAGE_SHIFT - 10)) + #endif /* WRITEBACK_H */ |