linux-kernel - Re: [PATCH 33 of 66] madvise(MADV

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Message-ID: <20101209171435.GD19131@random.random>
Date:	Thu, 9 Dec 2010 18:14:35 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 33 of 66] madvise(MADV_HUGEPAGE)

On Thu, Nov 18, 2010 at 03:19:35PM +0000, Mel Gorman wrote:
> On Wed, Nov 03, 2010 at 04:28:08PM +0100, Andrea Arcangeli wrote:
> > @@ -121,6 +122,11 @@ static inline int split_huge_page(struct
> >  #define wait_split_huge_page(__anon_vma, __pmd)	\
> >  	do { } while (0)
> >  #define PageTransHuge(page) 0
> > +static inline int hugepage_madvise(unsigned long *vm_flags)
> > +{
> > +	BUG_ON(0);
> 
> What's BUG_ON(0) in aid of?

When CONFIG_TRANSPARENT_HUGEPAGE is disabled, nothing must call that
function (madvise must return -EINVAL like older kernels instead). But
I guess you meant I should convert the BUG_ON(0) to a BUG() instead? (done)

> I should have said it at patch 4 but don't forget that Michael Kerrisk
> should be made aware of MADV_HUGEPAGE so it makes it to a manual page
> at some point.

Ok, I'll forward patch 4.

Thanks,
Andrea
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