Re: [PATCH] Tweak tracing allocation sizes

Andi Kleen
2008-09-03T07:02:33Z

On Tue, Sep 02, 2008 at 05:55:16PM -0400, Christoph Hellwig wrote:
> On Tue, Sep 02, 2008 at 08:50:52AM +0200, Andi Kleen wrote:
> > > alternative - maybe a very large global trace buffer that is allocated at mount
> > > time and shared by all inodes?
> >
> > You could use vmalloc(). While that is also not fast it will at least
> > not stall.
>
> In fact kmem_alloc first tries vmalloc, and then falls back to slab
> when it fails. See fs/xfs/linux-2.6/kmem.c:kmem_alloc().

You mean the other way around?

Anyways it sounds like like MAX_SLAB_SIZE is just too big.

-Andi