linux-kernel - Re: [PATCH 1/2] drm/ttm: Add TTM_PAGE_FLAG

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Message-ID: <d6a07516-64bc-003d-946f-09f3cb9ded1c@daenzer.net>
Date:   Fri, 27 Apr 2018 10:41:54 +0200
From:   Michel Dänzer <michel@...nzer.net>
To:     zhoucm1 <zhoucm1@....com>,
        Christian König <christian.koenig@....com>
Cc:     dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/ttm: Add TTM_PAGE_FLAG_TRANSHUGE


[ Dropping Roger He, his e-mail address seems to bounce ]

On 2018-04-27 04:51 AM, zhoucm1 wrote:
> On 2018年04月26日 23:06, Michel Dänzer wrote:
>> From: Michel Dänzer <michel.daenzer@....com>
>>
>> When it's set, TTM tries to allocate huge pages if possible.
> Do you mean original driver doesn't do this?
> From the code, driver always try huge pages if
> CONFIG_TRANSPARENT_HUGEPAGE is enabled.

Right, before this change, TTM would do this unconditionally for all
drivers. The point of this change is not to incur any huge page related
overhead for drivers which can't take advantage of huge pages anyway.
I'll try changing the commit log to make this clearer in v2.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer