From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 03/12] mm, thp, tmpfs: handle huge page cases in
 shmem_getpage_gfp
Date: Wed, 16 Oct 2013 15:11:45 +0300 (EEST)
Message-ID: <20131016121145.EFC7AE0090@blue.fi.intel.com>
References: <20131015001214.GD3432@hippobay.mtv.corp.google.com>
 <20131015102912.2BC99E0090@blue.fi.intel.com>
 <CACz4_2eh3F2An9F0GxSvw8kSmn2VZbqbdRVGXA2B=gvPFCChUw@mail.gmail.com>
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Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
	Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org,
	Andi Kleen <ak@linux.intel.com>,
	Matthew Wilcox <willy@linux.intel.com>,
	Hillf Danton <dhillf@gmail.com>, Dave Hansen <dave@sr71.net>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
To: Ning Qu <quning@google.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
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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