linux-kernel - Re: [PATCH 03/12] mm, thp, tmpfs: handle huge page cases in shmem_getpage

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Message-Id: <20131016121145.EFC7AE0090@blue.fi.intel.com>
Date:	Wed, 16 Oct 2013 15:11:45 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Ning Qu <quning@...gle.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	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>, Dave Hansen <dave@...1.net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/12] mm, thp, tmpfs: handle huge page cases in
 shmem_getpage_gfp

Ning Qu wrote:
> you mean something like this? If so, then fixed.
> 
>                if (must_use_thp) {
>                         page = shmem_alloc_hugepage(gfp, info, index);
>                         if (page) {
>                                 count_vm_event(THP_WRITE_ALLOC);
>                         } else
>                                 count_vm_event(THP_WRITE_ALLOC_FAILED);
>                 } else {
>                         page = shmem_alloc_page(gfp, info, index);
>                 }
> 
>                 if (!page) {
>                         error = -ENOMEM;
>                         goto unacct;
>                 }
>                 nr = hpagecache_nr_pages(page);

Yeah.

count_vm_event() part still looks ugly, but I have similar in my code.
I'll think more how to rework in to make it better.

-- 
 Kirill A. Shutemov
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