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Date: Thu, 4 Feb 2016 01:45:07 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com>,
        Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>,
        Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
        Christoph Lameter <cl@gentwo.org>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Steve Capper <steve.capper@linaro.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>,
        Jerome Marchand <jmarchan@redhat.com>,
        Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Subject: Re: [PATCH 1/4] rmap: introduce rmap_walk_locked()
Message-ID: <20160203224507.GA22605@black.fi.intel.com>
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On Wed, Feb 03, 2016 at 02:40:19PM -0800, Andrew Morton wrote:
> On Wed,  3 Feb 2016 18:14:16 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> 
> > rmap_walk_locked() is the same as rmap_walk(), but caller takes care
> > about relevant rmap lock. It only supports anonymous pages for now.
> > 
> > It's preparation to switch THP splitting from custom rmap walk in
> > freeze_page()/unfreeze_page() to generic one.
> > 
> > ...
> >
> > +/* Like rmap_walk, but caller holds relevant rmap lock */
> > +int rmap_walk_locked(struct page *page, struct rmap_walk_control *rwc)
> > +{
> > +	/* only for anon pages for now */
> > +	VM_BUG_ON_PAGE(!PageAnon(page) || PageKsm(page), page);
> > +	return rmap_walk_anon(page, rwc, true);
> > +}
> 
> Should be rmap_walk_anon_locked()?

I leave interface open for further extension for file mappings, once it
will be needed. Interface is mirroring plain rmap_walk()

If you prefer to rename the function, I can do it too.

-- 
 Kirill A. Shutemov