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| author | Dai Ngo <dai.ngo@oracle.com> | 2022-07-16 02:54:53 +0300 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2022-07-30 03:16:56 +0300 |
| commit | 4271c2c0887562318a0afef97d32d8a71cbe0743 (patch) | |
| tree | 6e09d77bfaa2cfe8c2da92ce7722ce02f5ddb711 /fs/nfsd/nfsd.h | |
| parent | 0926c39515aa065a296e97dfc8790026f1e53f86 (diff) | |
| download | linux-4271c2c0887562318a0afef97d32d8a71cbe0743.tar.xz | |
NFSD: limit the number of v4 clients to 1024 per 1GB of system memory
Currently there is no limit on how many v4 clients are supported
by the system. This can be a problem in systems with small memory
configuration to function properly when a very large number of
clients exist that creates memory shortage conditions.
This patch enforces a limit of 1024 NFSv4 clients, including courtesy
clients, per 1GB of system memory. When the number of the clients
reaches the limit, requests that create new clients are returned
with NFS4ERR_DELAY and the laundromat is kicked start to trim old
clients. Due to the overhead of the upcall to remove the client
record, the maximun number of clients the laundromat removes on
each run is limited to 128. This is done to ensure the laundromat
can still process the other tasks in a timely manner.
Since there is now a limit of the number of clients, the 24-hr
idle time limit of courtesy client is no longer needed and was
removed.
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/nfsd.h')
| -rw-r--r-- | fs/nfsd/nfsd.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h index ef8087691138..57a468ed85c3 100644 --- a/fs/nfsd/nfsd.h +++ b/fs/nfsd/nfsd.h @@ -341,6 +341,8 @@ void nfsd_lockd_shutdown(void); #define NFSD_LAUNDROMAT_MINTIMEOUT 1 /* seconds */ #define NFSD_COURTESY_CLIENT_TIMEOUT (24 * 60 * 60) /* seconds */ +#define NFSD_CLIENT_MAX_TRIM_PER_RUN 128 +#define NFS4_CLIENTS_PER_GB 1024 /* * The following attributes are currently not supported by the NFSv4 server: |