xfs: introduce per-cpu CIL tracking structure

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The CIL push lock is highly contended on larger machines, becoming a
hard bottleneck that about 700,000 transaction commits/s on >16p
machines. To address this, start moving the CIL tracking
infrastructure to utilise per-CPU structures.

We need to track the space used, the amount of log reservation space
reserved to write the CIL, the log items in the CIL and the busy
extents that need to be completed by the CIL commit.  This requires
a couple of per-cpu counters, an unordered per-cpu list and a
globally ordered per-cpu list.

Create a per-cpu structure to hold these and all the management
interfaces needed, as well as the hooks to handle hotplug CPUs.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

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Dave Chinner 2022-07-02 02:13:52 +10:00 • committed by Dave Chinner

parent 31151cc342

commit af1c2146a5

3 changed files with 47 additions and 2 deletions

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30

fs/xfs/xfs_log_cil.c

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18

fs/xfs/xfs_log_priv.h

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1

fs/xfs/xfs_super.c

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