linux-kernel - Re: [PATCH v3 04/13] mm: Track NR_KERNEL_STACK in KiB instead of number of stacks

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Message-ID: <20160621094625.GA15970@esperanza>
Date:	Tue, 21 Jun 2016 12:46:25 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Andy Lutomirski <luto@...nel.org>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jann Horn <jann@...jh.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v3 04/13] mm: Track NR_KERNEL_STACK in KiB instead of
 number of stacks

On Mon, Jun 20, 2016 at 04:43:34PM -0700, Andy Lutomirski wrote:
> Currently, NR_KERNEL_STACK tracks the number of kernel stacks in a
> zone.  This only makes sense if each kernel stack exists entirely in
> one zone, and allowing vmapped stacks could break this assumption.
> 
> Since frv has THREAD_SIZE < PAGE_SIZE, we need to track kernel stack
> allocations in a unit that divides both THREAD_SIZE and PAGE_SIZE on
> all architectures.  Keep it simple and use KiB.
> 
> Cc: Vladimir Davydov <vdavydov@...tuozzo.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: linux-mm@...ck.org
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Reviewed-by: Vladimir Davydov <vdavydov@...tuozzo.com>