xfs: cache open zone in inode->i_private

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The MRU cache for open zones is unfortunately still not ideal, as it can
time out pretty easily when doing heavy I/O to hard disks using up most
or all open zones.  One option would be to just increase the timeout,
but while looking into that I realized we're just better off caching it
indefinitely as there is no real downside to that once we don't hold a
reference to the cache open zone.

So switch the open zone to RCU freeing, and then stash the last used
open zone into inode->i_private.  This helps to significantly reduce
fragmentation by keeping I/O localized to zones for workloads that
write using many open files to HDD.

Fixes: 4e4d520755 ("xfs: add the zoned space allocator")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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This commit is contained in:

Christoph Hellwig 2025-10-17 05:55:41 +02:00 • committed by Carlos Maiolino

parent a8c861f401

commit ca3d643a97

4 changed files with 53 additions and 85 deletions

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1

fs/xfs/xfs_mount.h

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6

fs/xfs/xfs_super.c

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129

fs/xfs/xfs_zone_alloc.c

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2

fs/xfs/xfs_zone_priv.h

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