linux-kernel - Re: [PATCH V2] mm: Allow userland to request that the kernel clear memory on release

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Message-ID: <20190426052520.GB12337@dhcp22.suse.cz>
Date:   Fri, 26 Apr 2019 07:25:20 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Matthew Garrett <mjg59@...gle.com>
Cc:     linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH V2] mm: Allow userland to request that the kernel clear
 memory on release

On Thu 25-04-19 13:39:01, Matthew Garrett wrote:
> On Thu, Apr 25, 2019 at 5:37 AM Michal Hocko <mhocko@...nel.org> wrote:
> > Besides that you inherently assume that the user would do mlock because
> > you do not try to wipe the swap content. Is this intentional?
> 
> Yes, given MADV_DONTDUMP doesn't imply mlock I thought it'd be more
> consistent to keep those independent.

Do we want to fail madvise call on VMAs that are not mlocked then? What
if the munlock happens later after the madvise is called?

-- 
Michal Hocko
SUSE Labs