xfs: update BDI {io,ra}_pages values based on the RT device limits

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When using XFS with a main device on an SSD that stores metadata and a RT
device to store data on a HDD, we fail to take the I/O sizes for the RT
device into accounting, leading to up to 5% slower read performance when
using an SSD for metadata vs storing data and metadata on the HDD.

Fix this up by taking the RT settings into account at mount an restoring
the old settings at unmount time, unless the BDI settings have changed
from those set by XFS.

Reported-by: Filip Blagojevic <filip.blagojevic@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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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This commit is contained in:

Christoph Hellwig 2026-07-20 16:08:47 +02:00 • committed by Carlos Maiolino

parent d852729c5f

commit 7aa67044e7

2 changed files with 59 additions and 1 deletions

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7

fs/xfs/xfs_mount.h

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53

fs/xfs/xfs_super.c

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