Giantless VFS.

[Jeff Roberson]

On Tue, 23 Nov 2004, Peter Holm wrote:

> On Mon, Nov 22, 2004 at 06:46:50AM -0500, Jeff Roberson wrote:
> > On Mon, 22 Nov 2004, Ivan Voras wrote:
> >
> > > Jeff Roberson wrote:
> > >
> > > > The short description:
> > > > This patch removes Giant from the read(), write(), and fstat() syscalls,
> > > > as well as page faults, and bufdone (io interrupts) when using FFS.  It
> > >
> > > What is the plan re: RELENG_5? Will things like this (giantless vm, fs)
> > > be merged into it?
> >
> > The giantless vm was already merged back to RELENG_5 and enabled on amd64,
> > and i386.  I hope to merge the giantless vfs back after a month or so of
> > no problems on -current.  I hope to commit it to -current this week.
> >
> > I haven't received any feedback from the list though.  I hope people are
> > testing it.  Perhaps the silence indicates universal success? :-)
> >
>
> Here's a problem I ran into during stress test:
>
> http://www.holm.cc/stress/log/jeff01.html
>
> Let me know if you need more gdb output.

Thanks, this is the most serious bug of the couple that were reported.  It
indicates a possible race to flush a buffer.  I'm still looking for this.
What steps did you take to produce this panic?

>
> - Peter
>
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