linux-kernel - RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option

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Date:	Fri, 18 Dec 2015 06:59:08 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Xishi Qiu <qiuxishi@...wei.com>
CC:	"Izumi, Taku" <izumi.taku@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mel@....ul.ie" <mel@....ul.ie>,
	"Hansen, Dave" <dave.hansen@...el.com>,
	"matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>
Subject: RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option

>Hmm...like this ?
>       sysctl.vm.fallback_mirror_memory = 0  // never fallback  # default.
>       sysctl.vm.fallback_mirror_memory = 1  // the user memory may be allocated from mirrored zone.
>       sysctl.vm.fallback_mirror_memory = 2  // usually kernel allocates memory from mirrored zone before OOM.
>       sysctl.vm.fallback_mirror_memory = 3  // 1+2

Should option 2 say: // allow kernel to allocate from non-mirror zone to avoid OOM

> However I believe my customer's choice is always 0, above implementation can be done in a clean way.
> (adding a flag to zones (mirrored or not) and controlling fallback zonelist walk.)

Modes allow us to make all of the people happy (I hope).

> BTW, we need this Taku's patch to make a progress. I think other devs should be done in another
> development cycle. What does he need to get your Acks ?

The concept is great.   It's even "Tested-by: Tony Luck <tony.luck@...el.com>".
I need to read the code more carefully before Acked-by.

-Tony
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