svn commit: r260898 - head/sys/kern

[Adrian Chadd]

.. Make it be an offset into the table rather than a pointer, then we can
do dirty rcu style hacks to just replace and grow the table as we need more
memory.

Don't we have a standard way to pull memory from the top of the physmem
area early on for allocations like this?

Adrian
On Jan 20, 2014 3:50 PM, "John Baldwin" <jhb at freebsd.org> wrote:

> On Sunday 19 January 2014 18:18:03 Rui Paulo wrote:
> > On 19 Jan 2014, at 17:59, Neel Natu <neel at FreeBSD.org> wrote:
> > > Author: neel
> > > Date: Mon Jan 20 01:59:35 2014
> > > New Revision: 260898
> > > URL: http://svnweb.freebsd.org/changeset/base/260898
> > >
> > > Log:
> > >  Bump up WITNESS_COUNT from 1024 to 1536 so there are sufficient
> entries
> > >  for
> > >  WITNESS to actually work.
> >
> > This value should be automatically tuned...
>
> How do you propose to do so?  This is the count of locks initialized before
> witness' own SYSINIT is executed and the array it sizes is allocated
> statically at compile time.  This used to not be a static array, but an
> intrusive list embedded in locks themselves, but we decided to shave a
> pointer off of each lock that was only used for that and to use a
> statically
> sized table instead.
>
> --
> John Baldwin
>