NFSD: add shrinker to reap courtesy clients on low memory condition

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Add courtesy_client_reaper to react to low memory condition triggered
by the system memory shrinker.

The delayed_work for the courtesy_client_reaper is scheduled on
the shrinker's count callback using the laundry_wq.

The shrinker's scan callback is not used for expiring the courtesy
clients due to potential deadlocks.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Dai Ngo 2022-09-14 08:54:26 -07:00 • committed by Chuck Lever

parent 3a4ea23d86

commit 7746b32f46

4 changed files with 96 additions and 12 deletions

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2

fs/nfsd/netns.h

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94

fs/nfsd/nfs4state.c

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fs/nfsd/nfsctl.c

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fs/nfsd/nfsd.h

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