linux-kernel - Re: [PATCH 19/23] truncate: support huge pages

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Message-ID: <20130806205716.GA4031@shutemov.name>
Date:	Tue, 6 Aug 2013 23:57:16 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Dave Hansen <dave@...1.net>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hillf Danton <dhillf@...il.com>, Ning Qu <quning@...gle.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19/23] truncate: support huge pages

On Tue, Aug 06, 2013 at 01:23:48PM -0700, Dave Hansen wrote:
> On 08/03/2013 07:17 PM, Kirill A. Shutemov wrote:
> > +			if (PageTransTailCache(page)) {
> > +				/* part of already handled huge page */
> > +				if (!page->mapping)
> > +					continue;
> > +				/* the range starts in middle of huge page */
> > +				partial_thp_start = true;
> > +				start = index & ~HPAGE_CACHE_INDEX_MASK;
> > +				continue;
> > +			}
> > +			/* the range ends on huge page */
> > +			if (PageTransHugeCache(page) &&
> > +				index == (end & ~HPAGE_CACHE_INDEX_MASK)) {
> > +				partial_thp_end = true;
> > +				end = index;
> > +				break;
> > +			}
> 
> Still reading through the code, but that "index ==" line's indentation
> is screwed up.  It makes it look like "index == " is a line of code
> instead of part of the if() condition.

I screwed it up myself. Otherwise, the line is too long. :-/

Probably, I should move partial page logic into separate function.

-- 
 Kirill A. Shutemov
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