Re: [PATCH] Tweak tracing allocation sizes

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

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