From: Michal Hocko <mhocko@suse.com>
To: Peter.Enderborg@sony.com
Cc: christian.koenig@amd.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, sumit.semwal@linaro.org,
adobriyan@gmail.com, akpm@linux-foundation.org,
songmuchun@bytedance.com, guro@fb.com, shakeelb@google.com,
neilb@suse.de, samitolvanen@google.com, rppt@kernel.org,
linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, willy@infradead.org
Subject: Re: [PATCH v4] dma-buf: Add DmaBufTotal counter in meminfo
Date: Tue, 20 Apr 2021 11:12:33 +0200 [thread overview]
Message-ID: <YH6bASnaRIV4DGpI@dhcp22.suse.cz> (raw)
In-Reply-To: <5efa2b11-850b-ad89-b518-b776247748a4@sony.com>
On Tue 20-04-21 09:02:57, Peter.Enderborg@sony.com wrote:
>
> >> But that isn't really system memory at all, it's just allocated device
> >> memory.
> > OK, that was not really clear to me. So this is not really accounted to
> > MemTotal? If that is really the case then reporting it into the oom
> > report is completely pointless and I am not even sure /proc/meminfo is
> > the right interface either. It would just add more confusion I am
> > afraid.
> >
>
> Why is it confusing? Documentation is quite clear:
Because a single counter without a wider context cannot be put into any
reasonable context. There is no notion of the total amount of device
memory usable for dma-buf. As Christian explained some of it can be RAM
based. So a single number is rather pointless on its own in many cases.
Or let me just ask. What can you tell from dma-bud: $FOO kB in its
current form?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-04-20 9:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-17 10:40 [PATCH v4] dma-buf: Add DmaBufTotal counter in meminfo Peter Enderborg
2021-04-17 10:59 ` Christian König
2021-04-17 11:20 ` Peter.Enderborg
2021-04-17 11:54 ` Christian König
2021-04-17 12:13 ` Peter.Enderborg
2021-04-20 8:39 ` Daniel Vetter
2021-04-17 13:07 ` [External] " Muchun Song
2021-04-17 13:43 ` Peter.Enderborg
2021-04-17 14:21 ` Muchun Song
2021-04-17 15:03 ` Christian König
2021-04-19 12:16 ` Michal Hocko
2021-04-19 12:41 ` Peter.Enderborg
2021-04-19 15:00 ` Michal Hocko
2021-04-19 15:19 ` Peter.Enderborg
2021-04-19 15:44 ` Christian König
2021-04-19 16:11 ` Michal Hocko
2021-04-19 16:37 ` Christian König
2021-04-20 7:04 ` Michal Hocko
2021-04-20 7:20 ` Mike Rapoport
2021-04-20 7:47 ` Michal Hocko
2021-04-20 7:32 ` Christian König
2021-04-20 7:46 ` Michal Hocko
2021-04-20 8:00 ` Christian König
2021-04-20 8:28 ` Michal Hocko
2021-04-20 9:02 ` Peter.Enderborg
2021-04-20 9:12 ` Michal Hocko [this message]
2021-04-20 9:25 ` Peter.Enderborg
2021-04-20 11:04 ` Michal Hocko
2021-04-20 11:24 ` Peter.Enderborg
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YH6bASnaRIV4DGpI@dhcp22.suse.cz \
--to=mhocko@suse.com \
--cc=Peter.Enderborg@sony.com \
--cc=adobriyan@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=christian.koenig@amd.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=guro@fb.com \
--cc=linaro-mm-sig@lists.linaro.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=neilb@suse.de \
--cc=rppt@kernel.org \
--cc=samitolvanen@google.com \
--cc=shakeelb@google.com \
--cc=songmuchun@bytedance.com \
--cc=sumit.semwal@linaro.org \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).