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

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Message-ID: <AANLkTinwFt+KDKNEYP9MWQ7wGb9qk=E2Xa3RJB3+MJnN@mail.gmail.com>
Date:	Fri, 17 Dec 2010 15:53:55 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	tglx@...utronix.de, mingo@...e.hu, greg@...ah.com,
	akpm@...ux-foundation.org, ying.huang@...el.com,
	Borislav Petkov <bp@...en8.de>,
	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 Fri, Dec 17, 2010 at 3:11 PM, H. Peter Anvin <hpa@...or.com> wrote:
> There are two models I can think of:
>
> 1. a file where the head is automatically dropped as space requires.
> 2. a filesystem where the oldest files are automatically reclaimed.
>
> 1 has been implemented in actual systems, 2 is kind of a logical extension.

#2 sounds more applicable here (we have some multi-kilobyte
blobs of data, one from each kmsg_dumper invocation - and
it would seem useful to keep them as separate entities)

I'm not sure whether everyone would be happy with this. Imagine you
have a system that gets two OOPs, followed by a full panic - but that
the persistent store only has space for two of the three reports. I think
that most people would want the first OOPs and the panic ... i.e.
drop the middle bit, rather than the oldest bit.

-Tony
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