linux-kernel - Re: + mm-vmscan-reclaim-order-0-and-use-compaction-instead-of-lumpy-reclaim-avoid-a-potential-deadlock-due-to-lock_page-during-direct-compaction-fix.patch added to -mm tree

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Date:	Tue, 11 Jan 2011 13:43:06 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	linux-kernel@...r.kernel.org
cc:	mm-commits@...r.kernel.org, akpm@...ux-foundation.org,
	hughd@...gle.com, mel@....ul.ie
Subject: Re: + mm-vmscan-reclaim-order-0-and-use-compaction-instead-of-lumpy-reclaim-avoid-a-potential-deadlock-due-to-lock_page-during-direct-compaction-fix.patch
 added to -mm tree

On Tue, 11 Jan 2011, akpm@...ux-foundation.org wrote:

> diff -puN mm/page_alloc.c~mm-vmscan-reclaim-order-0-and-use-compaction-instead-of-lumpy-reclaim-avoid-a-potential-deadlock-due-to-lock_page-during-direct-compaction-fix mm/page_alloc.c
> --- a/mm/page_alloc.c~mm-vmscan-reclaim-order-0-and-use-compaction-instead-of-lumpy-reclaim-avoid-a-potential-deadlock-due-to-lock_page-during-direct-compaction-fix
> +++ a/mm/page_alloc.c
> @@ -1815,15 +1815,15 @@ __alloc_pages_direct_compact(gfp_t gfp_m
>  	int migratetype, unsigned long *did_some_progress)
>  {
>  	struct page *page;
> -	struct task_struct *p = current;
> +	struct task_struct *tsk = current;
>  
>  	if (!order || compaction_deferred(preferred_zone))
>  		return NULL;
>  
> -	p->flags |= PF_MEMALLOC;
> +	tsk->flags |= PF_MEMALLOC;
>  	*did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask,
>  								nodemask);
> -	p->flags &= ~PF_MEMALLOC;
> +	tsk->flags &= ~PF_MEMALLOC;
>  	if (*did_some_progress != COMPACT_SKIPPED) {
>  
>  		/* Page migration frees to the PCP lists but we want merging */

This could be done for all of the page allocator functions in 
mm/page_alloc.c, I think it would be inconsistent and slightly harder to 
read if it were done in only one.
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