linux-kernel - Re: [PATCH 1/4] mm: Track NR_KERNEL_STACK in KiB instead of number of stacks

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Message-ID: <20160714192237.GA13522@cmpxchg.org>
Date:	Thu, 14 Jul 2016 15:22:37 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 1/4] mm: Track NR_KERNEL_STACK in KiB instead of number
 of stacks

On Thu, Jul 14, 2016 at 12:14:10PM -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
> Reviewed-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Reviewed-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Acked-by: Johannes Weiner <hannes@...xchg.org>