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

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Message-ID: <AANLkTim51KRmJ66OwQ=EyZia8GojhX9TMikpgAMLXRgo@mail.gmail.com>
Date:	Mon, 20 Dec 2010 13:09:41 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Tony Luck <tony.luck@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, 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,
	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 Mon, Dec 20, 2010 at 10:58 AM, Borislav Petkov <bp@...en8.de> wrote:
> Yes, this was exactly what I was trying to say! Do something in a
> watchdog handler path that shows that we actually made progress. But
> you're right, we'd still need the notification. My look at "did we make
> a progress" was too simple and there _are_ nuances which need to be
> accounted for.

My view of the notification is:
1) Oops happens, gets written to persistent store.
2) fs/pstore code makes a file appear in /dev/pstore
3) Daemon that's watching /dev/pstore sees new file
4) File is read, copied some place safe and fsync'd
5) Daemon unlinks file from /dev/pstore
6) fs/pstore code tells platform level to erase record

-Tony
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