linux-kernel - Re: [PATCH v2] dma-buf: Add DmaBufTotal counter in meminfo

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Message-ID: <9d4b7f7d-1a7d-0899-bf33-49fac1847bbe@sony.com>
Date:   Tue, 20 Apr 2021 13:46:29 +0000
From:   <Peter.Enderborg@...y.com>
To:     <daniel@...ishbar.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <sumit.semwal@...aro.org>, <christian.koenig@....com>,
        <adobriyan@...il.com>, <akpm@...ux-foundation.org>,
        <songmuchun@...edance.com>, <guro@...com>, <shakeelb@...gle.com>,
        <mhocko@...e.com>, <neilb@...e.de>, <samitolvanen@...gle.com>,
        <rppt@...nel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>, <willy@...radead.org>
Subject: Re: [PATCH v2] dma-buf: Add DmaBufTotal counter in meminfo

On 4/20/21 3:34 PM, Daniel Stone wrote:
> Hi Peter,
>
> On Fri, 16 Apr 2021 at 13:34, Peter Enderborg <peter.enderborg@...y.com <mailto:peter.enderborg@...y.com>> 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.
>
>
> FWIW, this won't work super well for Android where gralloc is implemented as a system service, so all graphics usage will instantly be accounted to it.
>
> Cheers,
> Daniel 

This resource allocation is a big part of why we need it. Why should it not work?