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authorJ. Bruce Fields <bfields@redhat.com>2017-09-20 02:25:41 +0300
committerJ. Bruce Fields <bfields@redhat.com>2017-10-04 23:25:01 +0300
commitde766e570413bd0484af0b580299b495ada625c3 (patch)
treee878d184e21f22b5ef2bc67346e17b6bf07b3259 /fs/nfsd
parent44d8660d3bb0a1c8363ebcb906af2343ea8e15f6 (diff)
downloadlinux-de766e570413bd0484af0b580299b495ada625c3.tar.xz
nfsd: give out fewer session slots as limit approaches
Instead of granting client's full requests until we hit our DRC size limit and then failing CREATE_SESSIONs (and hence mounts) completely, start granting clients smaller slot tables as we approach the limit. The factor chosen here is pretty much arbitrary. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 0c04f81aa63b..9db8a19cceaa 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1472,6 +1472,11 @@ static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
spin_lock(&nfsd_drc_lock);
avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
nfsd_drc_max_mem - nfsd_drc_mem_used);
+ /*
+ * Never use more than a third of the remaining memory,
+ * unless it's the only way to give this client a slot:
+ */
+ avail = clamp_t(int, avail, slotsize, avail/3);
num = min_t(int, num, avail / slotsize);
nfsd_drc_mem_used += num * slotsize;
spin_unlock(&nfsd_drc_lock);