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[0/2] NFSD: memory shrinker for NFSv4 clients

Message ID 1661554886-26025-1-git-send-email-dai.ngo@oracle.com (mailing list archive)
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Series NFSD: memory shrinker for NFSv4 clients | expand

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Dai Ngo Aug. 26, 2022, 11:01 p.m. UTC 
This patch series implements the memory shrinker for NFSv4 clients
to react to system low memory condition.

The memory shrinker's count callback is used to trigger the laundromat.
The actual work of destroying the expired clients is done by the
laundromat itself. We can not destroying the expired clients on the
memory shrinler's scan callback context to avoid possible deadlock.

By destroying the expired clients, all states associated with these
clients are also released.

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Dai Ngo (2):
      NFSD: keep track of the number of courtesy clients in the system
      NFSD: add shrinker to reap courtesy clients on low memory condition

 fs/nfsd/netns.h     |  5 ++++
 fs/nfsd/nfs4state.c | 69 ++++++++++++++++++++++++++++++++++++++++++------
 fs/nfsd/nfsctl.c    |  6 +++--
 fs/nfsd/nfsd.h      |  9 +++++--
 4 files changed, 77 insertions(+), 12 deletions(-)