Re: [PATCH] regression: vmalloc easily fail.

Nick Piggin
2008-10-30T01:53:48Z

On Wed, Oct 29, 2008 at 08:07:37PM -0200, Glauber Costa wrote:
> On Wed, Oct 29, 2008 at 11:43:33AM +0100, Nick Piggin wrote:
> > On Wed, Oct 29, 2008 at 12:29:40PM +0200, Avi Kivity wrote:
> > > Nick Piggin wrote:
> > > >Hmm, spanning <30MB of memory... how much vmalloc space do you have?
> > > >
> > > >
> > >
> > > From the original report:
> > >
> > > >VmallocTotal: 122880 kB
> > > >VmallocUsed: 15184 kB
> > > >VmallocChunk: 83764 kB
> > >
> > > So it seems there's quite a bit of free space.
> > >
> > > Chunk is the largest free contiguous region, right? If so, it seems the
> >
> > Yes.
> >
> >
> > > problem is unrelated to guard pages, instead the search isn't finding a
> > > 1-page area (with two guard pages) for some reason, even though lots of
> > > free space is available.
> >
> > Hmm. The free area search could be buggy...
> Do you want me to grab any specific info of it? Or should I just hack myself
> randomly into it? I'll probably have some time for that tomorrow.

I can take a look at it, in the next day or two. If you hack at it, and
find the problem I wouldn't be upset ;)