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Message-ID: <20160616111053.GA13143@esperanza>
Date: Thu, 16 Jun 2016 14:10:53 +0300
From: Vladimir Davydov <vdavydov@...tuozzo.com>
To: Andy Lutomirski <luto@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
<x86@...nel.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>,
Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
<linux-mm@...ck.org>
Subject: Re: [PATCH 04/13] mm: Track NR_KERNEL_STACK in pages instead of
number of stacks
On Wed, Jun 15, 2016 at 05:28:26PM -0700, Andy Lutomirski wrote:
...
> @@ -225,7 +225,8 @@ static void account_kernel_stack(struct thread_info *ti, int account)
> {
> struct zone *zone = page_zone(virt_to_page(ti));
>
> - mod_zone_page_state(zone, NR_KERNEL_STACK, account);
> + mod_zone_page_state(zone, NR_KERNEL_STACK,
> + THREAD_SIZE / PAGE_SIZE * account);
It won't work if THREAD_SIZE < PAGE_SIZE. Is there an arch with such a
thread size, anyway? If no, we should probably drop thread_info_cache.
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