linux-kernel - Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section

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: <20190507174336.GU31017@dhcp22.suse.cz>
Date:   Tue, 7 May 2019 19:43:36 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Sasha Levin <sashal@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Mikhail Zaslonko <zaslonko@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Pasha Tatashin <Pavel.Tatashin@...rosoft.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct
 pages for the full memory section

On Tue 07-05-19 10:36:55, Matthew Wilcox wrote:
> On Tue, May 07, 2019 at 07:32:24PM +0200, Michal Hocko wrote:
> > On Tue 07-05-19 13:18:06, Sasha Levin wrote:
> > > Michal, is there a testcase I can plug into kselftests to make sure we
> > > got this right (and don't regress)? We care a lot about memory hotplug
> > > working right.
> > 
> > As said in other email. The memory hotplug tends to work usually. It
> > takes unexpected memory layouts which trigger corner cases. This makes
> > testing really hard.
> 
> Can we do something with qemu?  Is it flexible enough to hotplug memory
> at the right boundaries?

No idea. But I have tried to describe those layouts in the changelog so
if somebody can come up with a way to reproduce them under kvm/qemu I
would really appreciate that.

-- 
Michal Hocko
SUSE Labs