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

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Date:	Wed, 22 Dec 2010 00:32:24 +0000
From:	David Howells <dhowells@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	dhowells@...hat.com, "Luck, Tony" <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...il.com>,
	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

Huang Ying <ying.huang@...el.com> wrote:

> The user space program (syslogd) is in my big picture, it will guarantee
> an oops meesage actually go to disk via something like fsync.  After
> doing that, the user space program can erase the corresponding record in
> persistent storage to free the space.  So all in all, oops messages not
> causing system panic or disk error will go to disk eventually and being
> freed and will not use up the persistent storage.

I see.  So you rely on fsync() to hang forever if the message can't be written
to disk because an oops killed the write path?

David
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