linux-kernel - Re: [patch 12/21] No Reclaim LRU Infrastructure

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Date:	Tue, 4 Mar 2008 16:21:13 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch 12/21] No Reclaim LRU Infrastructure

On Tue, 04 Mar 2008 10:05:58 -0500
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> > IMHO insert "lru" word is better.
> > example,
> > 
> > config NORECLAIM_LRU
> > 	bool "Zone LRU of track non-reclaimable pages (EXPERIMENTAL; 64BIT only)"
> > 	depends on EXPERIMENTAL && 64BIT
> 
> OK.  But, I'd suggest the 'bool' description be something like:
> 
> config NORECLAIM_LRU
> 	bool "Add LRU list to track non-reclaimable pages (EXPERIMENTAL; 64BIT only)"

I have added this in the 2.6.25-rc3-mm1 port.

> > 
> > > @@ -356,8 +380,10 @@ void release_pages(struct page **pages, 
> > >  				zone = pagezone;
> > >  				spin_lock_irqsave(&zone->lru_lock, flags);
> > >  			}
> > > -			VM_BUG_ON(!PageLRU(page));
> > > -			__ClearPageLRU(page);
> > > +			is_lru_page = PageLRU(page);
> > > +			VM_BUG_ON(!(is_lru_page));
> > > +			if (is_lru_page)
> > > +				__ClearPageLRU(page);
> > >  			del_page_from_lru(zone, page);
> > >  		}
> > 
> > it seems unnecessary change??
> 
> Hmmm.  Not sure what I was thinking here.  Might be a relic of some
> previous debug instrumentation.  Guess I don't have any problem with
> removing this change.

Removed.

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