linux-kernel - Re: [rfc][patch] mm: madvise(WILLNEED) for anonymous memory

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Date:	Thu, 20 Dec 2007 16:23:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Nick Piggin <npiggin@...e.de>,
	riel <riel@...hat.com>, Lennart Poettering <mztabzr@...inter.de>
Subject: Re: [rfc][patch] mm: madvise(WILLNEED) for anonymous memory


On Thu, 2007-12-20 at 16:18 +0100, Peter Zijlstra wrote:

> +static int madvise_willneed_anon_pte(pte_t *ptep,
> +		unsigned long start, unsigned long end, void *arg)
> +{
> +	struct vm_area_struct *vma = arg;
> +	struct page *page;
> +
> +	page = read_swap_cache_async(pte_to_swp_entry(*ptep), GFP_KERNEL,

Argh, with HIGHPTE this is done inside a kmap_atomic.

/me goes complicate the code with page pre-allocation..


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