linux-kernel - Re: [concept & "good taste" review] persistent store

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Date:	Tue, 21 Dec 2010 08:48:14 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, "greg@...ah.com" <greg@...ah.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Kyungmin Park <kmpark@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [concept & "good taste" review] persistent store

On Tue, 2010-12-21 at 01:19 +0800, Tony Luck wrote:
> On Sun, Dec 19, 2010 at 6:47 PM, Huang Ying <ying.huang@...el.com> wrote:
> > 8KB is about 100-200 lines message, sometimes it may be not enough for
> > all necessary information.  But in fact, we can use multiple ERST
> > records to save one kernel message dumping. So the real limitation is
> > just total storage capacity.
> 
> We can - but it will be a bit messy within my pstore + platform driver
> framework (I'd have to have erst tell pstore that it could handle some
> larger size, 2x or 3x the actual record size and then break a write
> into pieces. Presumably re-assemble on the read side too).

If persistent storage driver (such as ERST) implements kmsg_dumper by
themselves, that should be easier to use multiple records for one
message dumping request.

Best Regards,
Huang Ying


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