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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3908561D78D1C84285E8C5FCA982C28F39F88DAC@ORSMSX114.amr.corp.intel.com>
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
--
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/