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From: Eric Anholt <eric@anholt.net>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>,
	dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v4] drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl
Date: Thu, 19 Oct 2017 13:09:57 -0700	[thread overview]
Message-ID: <87vaja6gru.fsf@anholt.net> (raw)
In-Reply-To: <20171019125748.3152-1-boris.brezillon@free-electrons.com>


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Boris Brezillon <boris.brezillon@free-electrons.com> writes:

> This ioctl will allow us to purge inactive userspace buffers when the
> system is running out of contiguous memory.
>
> For now, the purge logic is rather dumb in that it does not try to
> release only the amount of BO needed to meet the last CMA alloc request
> but instead purges all objects placed in the purgeable pool as soon as
> we experience a CMA allocation failure.
>
> Note that the in-kernel BO cache is always purged before the purgeable
> cache because those objects are known to be unused while objects marked
> as purgeable by a userspace application/library might have to be
> restored when they are marked back as unpurgeable, which can be
> expensive.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

I got an ack from Dave on the ioctl struct, so I think we're good to
go.  Reviewed and pushed.  Thanks!

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      reply	other threads:[~2017-10-19 20:09 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-19 12:57 [PATCH v4] drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl Boris Brezillon
2017-10-19 20:09 ` Eric Anholt [this message]

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