linux-kernel - Re: [PATCH] fix BUG_ON(!PageSlab) from fallback

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Message-ID: <Pine.LNX.4.64.0701041042020.21800@schroedinger.engr.sgi.com>
Date:	Thu, 4 Jan 2007 10:43:09 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Hugh Dickins <hugh@...itas.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix BUG_ON(!PageSlab) from fallback_alloc

On Thu, 4 Jan 2007, Pekka Enberg wrote:

> So, how about we rename the current cache_grow() to __cache_grow() and
> move the kmem_freepages() to a higher level function like this:
> 
> static int cache_grow(struct kmem_cache *cache,
>                                gfp_t flags, int nodeid)
> {
>        void *objp;
>        int ret;
> 
>        if (flags & __GFP_NO_GROW)
>                return 0;
> 
>        objp = kmem_getpages(cachep, flags, nodeid);
>        if (!objp)
>                return 0;
> 
>        ret = __cache_grow(cache, flags, nodeid, objp);
>        if (!ret)
>                kmem_freepages(cachep, objp);
> 
>        return ret;
> }
> 
> And use the non-allocating __cache_grow version() in fallback_alloc() instead?

Good idea if you can make it so that it is clean. There is some 
additional processing in cache_grow() that would have to be taken into 
account.

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