linux-kernel - Re: [linux-next] splice call weird results

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Message-ID: <20140527175127.GA2570@moon>
Date:	Tue, 27 May 2014 21:51:27 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [linux-next] splice call weird results

On Tue, May 27, 2014 at 10:20:46AM -0700, Cong Wang wrote:
> On Tue, May 27, 2014 at 3:27 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> > On Tue, May 27, 2014 at 01:20:13PM +0300, Kirill A. Shutemov wrote:
> >> Cyrill Gorcunov wrote:
> >> > Hi! While been trying to run criu on linux-next (due to recent Kirill's patch related
> >> > to /proc/pid/clear_refs with THP enabled) I noticed that it fails dumping programs when
> >> > moves data from memory pages into an image file. So I wrote pretty idiotic test and
> >> > run it on current fedora 20 kernel and then on linux-next.
> >> >
> >>
> >> +Al. He reworked splice code in linux-next.
> >
> > Thanks Kirill. Al, it looks like iter_file_splice_write no longer honor @len while
> > building kiocb vector but pushes as much as it can.
> 
> 
> I guess this should fix your problem:
> https://lkml.org/lkml/2014/5/27/353

Thanks, but i doubt, the problem I notice is rather in iter_file_splice_write.
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