From: <Peter.Enderborg@sony.com>
To: <mhocko@suse.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
<sumit.semwal@linaro.org>, <christian.koenig@amd.com>,
<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: Mon, 19 Apr 2021 12:41:58 +0000 [thread overview]
Message-ID: <c3f0da9c-d127-5edf-dd21-50fd5298acef@sony.com> (raw)
In-Reply-To: <YH10s/7MjxBBsjVL@dhcp22.suse.cz>
On 4/19/21 2:16 PM, Michal Hocko wrote:
> On Sat 17-04-21 12:40:32, Peter Enderborg wrote:
>> This adds a total used dma-buf memory. Details
>> can be found in debugfs, however it is not for everyone
>> and not always available. dma-buf are indirect allocated by
>> userspace. So with this value we can monitor and detect
>> userspace applications that have problems.
> The changelog would benefit from more background on why this is needed,
> and who is the primary consumer of that value.
>
> I cannot really comment on the dma-buf internals but I have two remarks.
> Documentation/filesystems/proc.rst needs an update with the counter
> explanation and secondly is this information useful for OOM situations
> analysis? If yes then show_mem should dump the value as well.
>
> From the implementation point of view, is there any reason why this
> hasn't used the existing global_node_page_state infrastructure?
I fix doc in next version. Im not sure what you expect the commit message to include.
The function of the meminfo is: (From Documentation/filesystems/proc.rst)
"Provides information about distribution and utilization of memory."
Im not the designed of dma-buf, I think global_node_page_state as a kernel
internal. dma-buf is a device driver that provides a function so I might be
on the outside. However I also see that it might be relevant for a OOM.
It is memory that can be freed by killing userspace processes.
The show_mem thing. Should it be a separate patch?
next prev parent reply other threads:[~2021-04-19 12:42 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 [this message]
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
2021-04-20 9:25 ` Peter.Enderborg
2021-04-20 11:04 ` Michal Hocko
2021-04-20 11:24 ` Peter.Enderborg
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