linux-kernel - Re: Q: On restoring terminal with hinted index

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Message-ID: <20120815161923.GH23657@moon>
Date:	Wed, 15 Aug 2012 20:19:23 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: Q: On restoring terminal with hinted index

On Wed, Aug 15, 2012 at 09:16:10AM -0700, H. Peter Anvin wrote:
> On 08/15/2012 08:25 AM, Cyrill Gorcunov wrote:
> > Hi Peter,
> > 
> > that happened that in a sake of restoring ptys after checkpoint
> > we need to create them with predefined indices, as they were at
> > moment of dumping. So we have two options -- 1) Open terminals
> > in sequence until needed index reached 2) Use some other way to
> > say the kernel that some index is preferred.
> > 
> > So I thought, would it be acceptible to provide such hint via
> > sysctl, as in patch below (note I've not even compiled it yet,
> > but would like to know your opinion early).
> > 
> > (Maybe even make it one shot, thus once ida_get_new_above called
> >  the pty_next reset to zero).
> > 
> 
> Pardon me while I vomit... an interaction between sysctl and open?  Talk
> about a race condition from hell.  It is stateful, and not connected to
> the filesystem instance that it is supposed to be affecting.  So no,
> please don't.  I understand your objective but it really needs to be
> something attached to the pts filesystem instance in question.

Sure, i'll think on finding some other way to provide such hint to the
kernel.

	Cyrill
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