linux-kernel - Re: [PATCH] procfs/dmabuf: Add /proc/<pid>/task/<tid>/dmabuf

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: <YBFOB9YJkWk0jK+f@dhcp22.suse.cz>
Date:   Wed, 27 Jan 2021 12:27:03 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Christian König <christian.koenig@....com>
Cc:     Jann Horn <jannh@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        kernel-team <kernel-team@...roid.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Michel Lespinasse <walken@...gle.com>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Andrei Vagin <avagin@...il.com>,
        Yafang Shao <laoar.shao@...il.com>, Hui Su <sh_def@....com>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH] procfs/dmabuf: Add /proc/<pid>/task/<tid>/dmabuf_fds

On Wed 27-01-21 12:01:55, Christian König wrote:
[...]
> Some years ago I've proposed an change to improve the OOM killer to take
> into account how much memory is reference through special file descriptors
> like device drivers or DMA-buf.
> 
> But that never want anywhere because of concerns that this would add to much
> overhead to the OOM killer.

I have to admit I do not remember such a discussion. There were many on
the related topic, concerns were mostly about a proper accounting of
shared resources or locking required to gain the information. I do not
remember overhead as being the main concern as oom is a real cold path.

Anyway, if you want to revamp those patches then feel free to CC me and
we can discuss further. I do not want to hijack this thread by an
unrelated topic.
-- 
Michal Hocko
SUSE Labs