From: "Zhou Yingchao" <yc_zhou@ncic.ac.cn>
To: "Hugh Dickins" <hugh@veritas.com>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
"akpm" <akpm@osdl.org>, "alan" <alan@redhat.com>,
"zxc" <zxc@ncic.ac.cn>
Subject: Re: Re: Re: Re: [RFC] PAGE_RW Should be added to PAGE_COPY ?
Date: Sat, 16 Sep 2006 14:38:19 +0800 [thread overview]
Message-ID: <20060916063823.14432FB044@ncic.ac.cn> (raw)
>
>I replied too hastily. I've since looked back to your original mail
Thank you for your patience.
>(in which you do mention Infiniband as an example, which has now
>helped to jog my brain), and realized that I was misinterpreting
>what you meant by "user-level network driver".
>
>The problem, as I now see it, is precisely with do_wp_page()'s
>TestSetPageLocked, as you first said.
Yeah, I think you get it. ^_^
>
>Yes, it would be good if we could do that check in some other,
>reliable way. The problem is that can_share_swap_page has to
>check page_mapcount (and PageSwapCache) and page_swapcount in
>an atomic way: the page lock is what we have used to guard the
>movement between mapcount and swapcount.
>
>I'll try to think whether we can do that better,
>but not until next week.
Ok, I expect for good news.
>
>Hugh
Yingchao Zhou
reply other threads:[~2006-09-16 6:38 UTC|newest]
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