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

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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D414A1E016@USINDEM103.corp.hds.com>
Date:	Tue, 11 Dec 2012 00:06:38 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	"Luck, Tony" <tony.luck@...el.com>, Don Zickus <dzickus@...hat.com>
CC:	"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

> A boot argument might help - so we can force use of pstore in cases where kdump is failing (or prevent use of pstore in cases where it
> seem to be preventing us getting to kdump ... I don't have a preference).  BUT this would only be useful if we had a repeatable
> problem so that we could switch to the other mode ... and it seems likely that the kinds of problems that cause pstore or kdump to fail
> would be weird cases that are not very repeatable :-(

I think it is helpful for reproducible problems because reasons of kdump failure vary widely.
For example, users may forget to erase vmcores from a dump disk and kdump fails due to lack of space.
Also, FC cable or other hardware may be broken.

But, The person I have to convince is not you but kexec engineers...

> 
> -Tony
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