linux-kernel - Re: Huge memory takes too long time to initialize on 4TB ?

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Date:	Tue, 22 May 2012 20:38:04 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	ethan zhao <ethan.kernel@...il.com>
cc:	aarcange@...hat.com, linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>
Subject: Re: Huge memory takes too long time to initialize on 4TB ?

On Wed, 23 May 2012, ethan zhao wrote:

> Hi, aarcange
> 
>    When I boot kernel 2.6.39-100.6.1.el6uek.x86_64(actually 3.0.26)on
> a 4TB memory machine, got following call trace,
> That shows huge memory take too long time to initialize ? any help ?,
> I compared the huge_memory.c code between 3.0.26 and the current
> 3.2.x, no change.
> 

This has nothing to do with mm/huge_memory.c, which is transparent 
hugepages code, it's the lengthy iteration done for a very large 
ZONE_NORMAL in setup_zone_migrate_reserve().  

This should be fixed by 938929f14cb5 ("mm: reduce the amount of work done 
when updating min_free_kbytes") and was merged in 3.3.  Let us know if 
there's still a problem after upgrading to either that or 3.4