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

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Message-ID: <1292978635.8743.96.camel@yhuang-dev>
Date:	Wed, 22 Dec 2010 08:43:55 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	David Howells <dhowells@...hat.com>
Cc:	"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

On Wed, 2010-12-22 at 08:32 +0800, David Howells wrote:
> 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?

Yes.  Or fsync() report error.

Best Regards,
Huang Ying


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