xfs: rework zone GC buffer management

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The double buffering where just one scratch area is used at a time does
not efficiently use the available memory.  It was originally implemented
when GC I/O could happen out of order, but that was removed before
upstream submission to avoid fragmentation.  Now that all GC I/Os are
processed in order, just use a number of buffers as a simple ring buffer.

For a synthetic benchmark that fills 256MiB HDD zones and punches out
holes to free half the space this leads to a decrease of GC time by
a little more than 25%.

Thanks to Hans Holmberg <hans.holmberg@wdc.com> for testing and
benchmarking.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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Christoph Hellwig 2026-01-14 14:06:43 +01:00 • committed by Carlos Maiolino

parent 0506d32f7c

commit 102f444b57

1 changed files with 59 additions and 47 deletions

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fs/xfs/xfs_zone_gc.c

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