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Date: Mon, 20 Dec 2010 09:19:32 -0800 From: Tony Luck <tony.luck@...il.com> To: Huang Ying <ying.huang@...el.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 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). It would be good to get some data from real users to see whether this is required, or whether ~8K actually is adequate in enough situations to allow us to keep the code simple. If anyone with a fairly new X86 server system (up to a couple of years old ... check to see whether it has ERST support in BIOS with: "dmesg | grep ERST") wants to test this, the latest code is in today's linux-next tree, tagged as "next-20101220". (I have some hope that we might get this together for the 2.6.38 merge window ... but if not, then 2.6.39 would be fine too). -Tony -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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