Re: SLUB: The unqueued Slab allocator

David Miller
2007-02-24T05:54:41Z

From: Christoph Lameter <clameter@engr.sgi.com>
Date: Fri, 23 Feb 2007 21:47:36 -0800 (PST)

> On Sat, 24 Feb 2007, KAMEZAWA Hiroyuki wrote:
>
> > >From a viewpoint of a crash dump user, this merging will make crash dump
> > investigation very very very difficult.
>
> The general caches already merge lots of users depending on their sizes.
> So we already have the situation and we have tools to deal with it.

But this doesn't happen for things like biovecs, and that will
make debugging painful.

If a crash happens because of a corrupted biovec-256 I want to know
it was a biovec not some anonymous clone of kmalloc256.

Please provide at a minimum a way to turn the merging off.

I also agree with Andi in that merging could mess up how object type
local lifetimes help reduce fragmentation in object pools.