linux-kernel - Re: [patch] tlb flush_data: replace per

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: <20090114152001.GS23848@one.firstfloor.org>
Date:	Wed, 14 Jan 2009 16:20:01 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Frederik Deweerdt <frederik.deweerdt@...og.eu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array

> To be fair, it also depends on whenever HOTPLUG_CPU is on or not (if it
> is we allocate NR_CPUS percpu sections).

not true to my knowledge. Even a !HOTPLUG_CPU kernel doesn't
allocate more than what is in the possible map. That would be dumb 
if it was true, but it isn't fortunately.

I don't think it does.
 In that case, which is Ubuntu's
> and Fedora's, 

You're saying that Ubuntu and Fedora do not support suspend to ram?
(suspend to ram requires CPU hotplug). At least my Fedora box
does S3 just fine so that cannot be correct.

we do save memory.
> This would make for a fairly long changelog, how about a link to this
> thread, and removing the NR_CPUS bit?

My original paragraph is correct and it's not long. At least your
claim is just wrong.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
--
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/