linux-kernel - Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of staging

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Date:   Tue, 14 Mar 2017 16:28:02 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Laura Abbott <labbott@...hat.com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Mark Brown <broonie@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Rom Lemarchand <romlem@...gle.com>, devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [RFC PATCH 00/12] Ion cleanup in preparation for moving out of
 staging

Le mardi 14 mars 2017 à 15:47 +0100, Benjamin Gaignard a écrit :
> Should we use /devi/ion/$heap instead of /dev/ion_$heap ?
> I think it would be easier for user to look into one directory rather
> then in whole /dev to find the heaps
> 
> > is that we don't have to worry about a limit of 32 possible
> > heaps per system (32-bit heap id allocation field). But dealing
> > with an ioctl seems easier than names. Userspace might be less
> > likely to hardcode random id numbers vs. names as well.
> 
> In the futur I think that heap type will be replaced by a "get caps"
> ioctl which will
> describe heap capabilities. At least that is my understanding of
> kernel part
> of "unix memory allocator" project

I think what we really need from userspace point of view, is the
ability to find a compatible heap for a set of drivers. And this
without specific knowledge of the drivers.

Nicolas
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