linux-kernel - Re: [PATCH 1/2] mm: Avoid putting a bad page back on the LRU

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Message-ID: <Pine.LNX.4.64.0804281238080.30548@schroedinger.engr.sgi.com>
Date:	Mon, 28 Apr 2008 12:39:06 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Russ Anderson <rja@....com>
cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 1/2] mm: Avoid putting a bad page back on the LRU

On Mon, 28 Apr 2008, Russ Anderson wrote:

> +#if (BITS_PER_LONG > 32)
> +#define PageMemError(page)	test_bit(PG_memerror, &(page)->flags)
> +#define SetPageMemError(page)	set_bit(PG_memerror, &(page)->flags)
> +#define ClearPageMemError(page)	clear_bit(PG_memerror, &(page)->flags)
> +#define PAGE_FLAGS	(1 << PG_lru   | 1 << PG_private   | 1 << PG_locked | \
> +			 1 << PG_buddy | 1 << PG_writeback | \
> +			 1 << PG_slab  | 1 << PG_swapcache | 1 << PG_active | \
> +			 1UL << PG_memerror)
> +#else
> +#define PageMemError(page)	0
> +#define PAGE_FLAGS	(1 << PG_lru   | 1 << PG_private   | 1 << PG_locked | \
> +			 1 << PG_buddy | 1 << PG_writeback | \
> +			 1 << PG_slab  | 1 << PG_swapcache | 1 << PG_active)
> +#endif
> +#define PAGE_FLAGS_RECLAIM	(PAGE_FLAGS | 1 << PG_reclaim | 1 << PG_dirty)
> +#define PAGE_FLAGS_RESERVE	(PAGE_FLAGS | 1 << PG_reserved)
> +#define PAGE_FLAGS_DIRTY	(PAGE_FLAGS | 1 << PG_reserved | 1 << PG_dirty)
> +

All the PAGE_FLAGS_xx things could be in a separate cleanup patch. Also 
note that the way page flags are defined may change soon.

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