linux-kernel - Re: [PATCH v2 02/10] mm/memory_hotplug: enforce section granularity when onlining/offlining

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: <20200824103917.GB6315@linux>
Date:   Mon, 24 Aug 2020 12:39:18 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: Re: [PATCH v2 02/10] mm/memory_hotplug: enforce section granularity
 when onlining/offlining

On Wed, Aug 19, 2020 at 07:59:49PM +0200, David Hildenbrand wrote:
> Already two people (including me) tried to offline subsections, because
> the function looks like it can deal with it. But we really can only
> online/offline full sections that are properly aligned (e.g., we can only
> mark full sections online/offline via SECTION_IS_ONLINE).
> 
> Add a simple safety net to document the restriction now. Current users
> (core and powernv/memtrace) respect these restrictions.

It's been a while since I looked at sub-section handling stuff so sorry to ask
this, but was it true that we can hot-{remove,add} sub-section granularity, while
we can only online /offline on section granularity?

> 
> Acked-by: Michal Hocko <mhocko@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>


-- 
Oscar Salvador
SUSE L3