linux-kernel - Re: [PATCH 03/33] mm: slub: add knowledge of reserve pages

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Message-Id: <200710312225.07249.nickpiggin@yahoo.com.au>
Date:	Wed, 31 Oct 2007 22:25:06 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, trond.myklebust@....uio.no
Subject: Re: [PATCH 03/33] mm: slub: add knowledge of reserve pages

On Wednesday 31 October 2007 23:17, Peter Zijlstra wrote:
> On Wed, 2007-10-31 at 21:46 +1100, Nick Piggin wrote:

> > And I'd prevent these ones from doing so.
> >
> > Without keeping track of "reserve" pages, which doesn't feel
> > too clean.
>
> The problem with that is that once a slab was allocated with the right
> allocation context, anybody can get objects from these slabs.

[snip]

I understand that.


> So we either reserve a page per object, which for 32 byte objects is a
> large waste, or we stop anybody who doesn't have the right permissions
> from obtaining objects. I took the latter approach.

What I'm saying is that the slab allocator slowpath should always
just check watermarks against the current task. Instead of this
->reserve stuff.
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