linux-kernel - Re: [PATCH] MM : alloc_large_system_hash() can free some memory for non power-of-two bucketsize

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Message-ID: <Pine.LNX.4.64.0705181118530.11881@schroedinger.engr.sgi.com>
Date:	Fri, 18 May 2007 11:21:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] MM : alloc_large_system_hash() can free some memory for
 non power-of-two bucketsize

On Fri, 18 May 2007, Eric Dumazet wrote:

>  			table = (void*) __get_free_pages(GFP_ATOMIC, order);

ATOMIC? Is there some reason why we need atomic here?

> +			/*
> +			 * If bucketsize is not a power-of-two, we may free
> +			 * some pages at the end of hash table.
> +			 */
> +			if (table) {
> +				unsigned long alloc_end = (unsigned long)table +
> +						(PAGE_SIZE << order);
> +				unsigned long used = (unsigned long)table +
> +						PAGE_ALIGN(size);
> +				while (used < alloc_end) {
> +					free_page(used);

Isnt this going to interfere with the kernel_map_pages debug stuff?

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