linux-kernel - Re: [RFC 7/7] mm: madvise support MADV_ANONYMOUS_FILTER and MADV_FILE

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Message-ID: <20190528123832.GD1658@dhcp22.suse.cz>
Date:   Tue, 28 May 2019 14:38:32 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Daniel Colascione <dancol@...gle.com>
Cc:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Tim Murray <timmurray@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Brian Geffon <bgeffon@...gle.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [RFC 7/7] mm: madvise support MADV_ANONYMOUS_FILTER and
 MADV_FILE_FILTER

On Tue 28-05-19 05:18:48, Daniel Colascione wrote:
[...]
> The important requirement, I think, is that we need to support
> managing "memory-naive" uncooperative tasks (perhaps legacy ones
> written before cross-process memory management even became possible),
> and I think that the cooperative-vs-uncooperative distinction matters
> a lot more than the tgid of the thread doing the memory manipulation.
> (Although in our case, we really do need a separate tgid. :-))

Agreed here and that requires some sort of revalidation and failure on
"object has changed" in one form or another IMHO.
-- 
Michal Hocko
SUSE Labs