linux-kernel - Re: [PATCH 3/3] ia64: Call migration code on correctable errors v2

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Message-ID: <20080502024342.GB1591@sgi.com>
Date:	Thu, 1 May 2008 21:43:43 -0500
From:	Russ Anderson <rja@....com>
To:	Christoph Lameter <clameter@....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 3/3] ia64: Call migration code on correctable errors v2

On Thu, May 01, 2008 at 06:22:29PM -0700, Christoph Lameter wrote:
> On Thu, 1 May 2008, Russ Anderson wrote:
> 
> > +int
> > +freeOneBadPage(unsigned long paddr)
> > +{
> > +	struct page *page, *page2, *target;
> > +
> > +	/*
> > +	 * Verify page address
> > +	 */
> > +	target = phys_to_page(paddr);
> > +	list_for_each_entry_safe(page, page2, &badpagelist, lru) {
> > +		if (page != target)
> > +			continue;
> > +
> > +		ClearPageMemError(page);        /* Mark the page as good */
> > +		move_to_lru(page);
> > +		list_del(&page->lru);
> 
> This is the wrong order. move_to_lru() uses the lru field. So do the 
> list_del first then the move. Note that there is a function 
> putback_lru_pages() that is used to put a list of pages back to the lru if 
> migration has failed and we give up on them. Could you use 
> putback_lru_pages() and then avoid the exporting of move_to_lru()?

I'll put the page on a different list and call putback_lru_pages().

> > +
> > +int
> > +freeAllBadPages(void)
> > +{
> > +	struct page *page, *page2;
> > +
> > +	list_for_each_entry_safe(page, page2, &badpagelist, lru) {
> > +		ClearPageMemError(page);        /* Mark the page as good */
> > +		totalbad_pages--;
> > +	}
> > +	putback_lru_pages(&badpagelist);
> > +	return 0;
> > +}
> 
> Ahh.. Here you use it.

This is when deleting all the pages on the list.

> > Index: linus/include/asm-ia64/page.h
> > ===================================================================
> > --- linus.orig/include/asm-ia64/page.h	2008-05-01 19:36:40.000000000 -0500
> > +++ linus/include/asm-ia64/page.h	2008-05-01 19:36:49.000000000 -0500
> > @@ -122,6 +122,7 @@ extern unsigned long max_low_pfn;
> >  #endif
> >  
> >  #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
> > +#define	phys_to_page(kaddr)	(pfn_to_page(kaddr >> PAGE_SHIFT))
> 
> #define phys_to_page virt_to_page ?

I'm not sure what you are asking.

#define phys_to_page(kaddr)     (pfn_to_page(kaddr >> PAGE_SHIFT))
#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

Do you mean change virt_to_page() like this?

#define virt_to_page(kaddr)     phys_to_page(__pa(kaddr))

Thanks,
-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@....com
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