linux-kernel - Re: [BUGFIX] set_mempolicy(MPOL_INTERLEAV) N_HIGH

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: <2c1ca41fbc03aeab347be61920e222b1.squirrel@webmail-b.css.fujitsu.com>
Date:	Tue, 28 Jul 2009 19:04:07 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Miao Xie" <miaox@...fujitsu.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Christoph Lameter" <cl@...ux-foundation.org>,
	"Paul Menage" <menage@...gle.com>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Yasunori Goto" <y-goto@...fujitsu.com>,
	"Pekka Enberg" <penberg@...helsinki.fi>,
	"David Rientjes" <rientjes@...gle.com>,
	"Lee Schermerhorn" <lee.schermerhorn@...com>,
	"linux-mm" <linux-mm@...ck.org>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [BUGFIX] set_mempolicy(MPOL_INTERLEAV) N_HIGH_MEMORY aware

Andi Kleen wrote:
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:
>
>> tested on x86-64/fake NUMA and ia64/NUMA.
>> (That ia64 is a host which orignal bug report used.)
>>
>> Maybe this is bigger patch than expected, but NODEMASK_ALLOC() will be a
>> way
>> to go, anyway. (even if CPUMASK_ALLOC is not used anyware yet..)
>> Kosaki tested this on ia64 NUMA. thanks.
>
> Note that low/high memory support in NUMA policy is only partial
> anyways, e.g. the VMA based policy only supports a single zone. That
> was by design choice and because NUMA has a lot of issues on 32bit due
> to the limited address space and is not widely used.
>
> So small fixes are ok but I wouldn't go to large effort to fix NUMA
> policy on 32bit.
>
ya, maybe you mention to something related to policy_zone.
It's checked only in bind code now. (from before 2.6.30..)
The bug was accessing NODE_DATA(nid), which is NULL.
(All possible node doesn't have pgdat)

Thanks,
-Kame


--
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/