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

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Message-ID: <20090224194329.GC24007@us.ibm.com>
Date:	Tue, 24 Feb 2009 13:43:29 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Dave Hansen <dave@...ux.vnet.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

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...

-serge
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