linux-kernel - RE: [RFC][PATCH] pstore: Skip spinlock when just one cpu is online

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Date:	Mon, 10 Dec 2012 23:55:48 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Don Zickus <dzickus@...hat.com>
CC:	"Luck, Tony" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cbouatmailru@...il.com" <cbouatmailru@...il.com>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [RFC][PATCH] pstore: Skip spinlock when just one cpu is online

> > If we can fix it with a small patch in adance, it is really helpful for us.
> 
> As I said in my email I just sent, it may not help you without testing it.
> As there are probably other problems in that un-tested theoretical scenario.

OK. I understood.

 
> >
> > 2)
> > In the long term, I plan to add a kmsg_dump to a kexec path because kdump may fail in the real world.
> > In that case, we need another troubleshooting material like pstore to detect a root cause of failure.
> 
> But you are assuming that kmsg_dump is perfect and it isn't, in which case by putting kmsg_dump in the kdump path, you actually may
> be blocking kdump from working.

That is why I'm trying to fix problems of pstore in panic path right now.
If kmsg_dump/pstore/platform drivers work well in panic path, they work in kdump path as well.

Seiji
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