Date: Wed, 4 Nov 2015 12:43:24 -0800 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> Subject: Re: svn commit: r289279 - in head/sys: kern vm Message-ID: <CAJ-Vmo=zJ4YCYKRTZj5F7sme-oKOJHXLBNS7=N9Q64bD8RSeYA@mail.gmail.com> In-Reply-To: <CAJ-Vmok5ndjfV0OrKf9R1-Dbec6Fah-GFph0u-HbvsxAAwZHBw@mail.gmail.com> References: <201510140210.t9E2A79H056595@repo.freebsd.org> <20151029212554.799f76eb@kalimero.tijl.coosemans.org> <CAJ-Vmok5ndjfV0OrKf9R1-Dbec6Fah-GFph0u-HbvsxAAwZHBw@mail.gmail.com>
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HI,
FYI - this patch did fix my initial issue, but further work in
multi-user mode caused it to still hang. I haven't diagnosed it yet; I
just put back the yield call so bufdaemon could run.
So yeah, we still have some work to do. It hit the same problem; stuck
in a loop calling the path to wakeup bufdaemon, but then not sleeping
on anything.
-adrian
On 2 November 2015 at 14:13, Adrian Chadd <adrian.chadd@gmail.com> wrote:
> 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
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