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Date: Mon, 2 Nov 2015 14:13:30 -0800
Message-ID: <CAJ-Vmok5ndjfV0OrKf9R1-Dbec6Fah-GFph0u-HbvsxAAwZHBw@mail.gmail.com>
Subject: Re: svn commit: r289279 - in head/sys: kern vm
From: Adrian Chadd <adrian.chadd@gmail.com>
To: Tijl Coosemans <tijl@freebsd.org>
Cc: Jeff Roberson <jeff@freebsd.org>, 
 "src-committers@freebsd.org" <src-committers@freebsd.org>, 
 "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, 
 "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
 Konstantin Belousov <kib@freebsd.org>
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Hi Tijl, and others;

Here's something that Jeff came up with that fixes my problem:

adrian@victoria:~/work/freebsd/head-embedded/src % svn diff sys/kern/
Index: sys/kern/vfs_bio.c
===================================================================
--- sys/kern/vfs_bio.c  (revision 290048)
+++ sys/kern/vfs_bio.c  (working copy)
@@ -2910,7 +2910,7 @@
        } while(buf_scan(false) == 0);

        if (reserved)
-               bufspace_release(maxsize);
+               atomic_subtract_long(&bufspace, maxsize);
        if (bp != NULL) {
                bp->b_flags |= B_INVAL;
                brelse(bp);


Would you/others please try this and see if it improves things? It
improves things for me on these memory-starved MIPS boards.



-a