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PR/45718 CVS commit: src/sys/kern

The following reply was made to PR kern/45718; it has been noted by GNATS.

From: "Taylor R Campbell" <>
Subject: PR/45718 CVS commit: src/sys/kern
Date: Sat, 28 Oct 2017 17:06:43 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sat Oct 28 17:06:43 UTC 2017
 Modified Files:
 	src/sys/kern: subr_pool.c
 Log Message:
 Allow only one pending call to a pool's backing allocator at a time.
 Candidate fix for problems with hanging after kva fragmentation related
 to PR kern/45718.
 Proposed on tech-kern:
 Tested by bouyer@ on i386.
 This makes one small change to the semantics of pool_prime and
 pool_setlowat: they may fail with EWOULDBLOCK instead of ENOMEM, if
 there is a pending call to the backing allocator in another thread but
 we are not actually out of memory.  That is unlikely because nearly
 always these are used during initialization, when the pool is not in
 XXX pullup-8
 XXX pullup-7
 XXX pullup-6 (requires tweaking the patch)
 XXX pullup-5...
 To generate a diff of this commit:
 cvs rdiff -u -r1.208 -r1.209 src/sys/kern/subr_pool.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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