linux-kernel - Re: [PATCH, RFC 06/16] thp, mm: rewrite add_to_page_cache

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Message-ID: <CAJd=RBAAdYef6+sHnD9kS=7mygSrgAD3cDW1wk8YsT2OK0sfZQ@mail.gmail.com>
Date:	Tue, 29 Jan 2013 20:11:01 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, RFC 06/16] thp, mm: rewrite add_to_page_cache_locked() to
 support huge pages

On Mon, Jan 28, 2013 at 5:24 PM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> @@ -443,6 +443,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
>                 pgoff_t offset, gfp_t gfp_mask)
>  {
>         int error;
> +       int nr = 1;
>
>         VM_BUG_ON(!PageLocked(page));
>         VM_BUG_ON(PageSwapBacked(page));
> @@ -450,31 +451,61 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
>         error = mem_cgroup_cache_charge(page, current->mm,
>                                         gfp_mask & GFP_RECLAIM_MASK);
>         if (error)
> -               goto out;
> +               return error;

Due to PageCompound check, thp could not be charged effectively.
Any change added for charging it?
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