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Commit de766e57 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

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: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 44d8660d

fs/nfsd/nfs4state.c

+5 −0
Original line number Diff line number Diff line
@@ -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);