linux-kernel - Re: [RFC][PATCH 3/5] check files for checkpointability

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Message-Id: <1235504839.26788.300.camel@nimitz>
Date:	Tue, 24 Feb 2009 11:47:19 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	containers <containers@...ts.linux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 3/5] check files for checkpointability

On Tue, 2009-02-24 at 13:43 -0600, Serge E. Hallyn wrote:
> Quoting Dave Hansen (dave@...ux.vnet.ibm.com):
> > On Mon, 2009-02-23 at 19:10 -0600, Serge E. Hallyn wrote:
> > > > This allows us to tell where and when we went wrong.  Take a process
> > > > that's been running for a month.  After 5 days it did something random
> > > > to keep it from being checkpointed.  You're going to have forgotten all
> > > > about it 25 days later.  This gives us an opportunity to spit into dmesg
> > > > or just plain log it.  It also gives the app some ability to reflect and
> > > > see what its uncheckpointable attributes are.  
> > > 
> > > Hmm.  In that case, rather than refuse checkpoint, I prefer that we make
> > > this a footnote in the /proc/$$/checkpointable output.
> > 
> > Yeah, that's cool.  If we were smart, we'd also get hooked into some of
> > the ftrace output so that we have a real chance of logging these things
> > and being able to go look at something about them down the line.
> 
> How exactly woudl that work?  Would that work as a *replacement* for
> filling up the logs as I was recommending?  If so I'm all for it...

I think it would be a replacement for dmesg, at least.  

-- Dave

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