From: Andi Kleen <andi@firstfloor.org>
To: Eric Anholt <eric@anholt.net>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, dri-devel@lists.sourceforge.net
Subject: Re: DRM lock ordering fix series
Date: Fri, 27 Mar 2009 19:10:18 +0100 [thread overview]
Message-ID: <20090327181018.GC11935@one.firstfloor.org> (raw)
In-Reply-To: <1238171805.8275.2434.camel@gaiman.anholt.net>
On Fri, Mar 27, 2009 at 09:36:45AM -0700, Eric Anholt wrote:
> > > You are aware that there is a fast path now (get_user_pages_fast) which
> > > is significantly faster? (but has some limitations)
> >
> > In the code I have, get_user_pages_fast is just a wrapper that calls the
> > get_user_pages in the way that I'm calling it from the DRM.
>
> Ah, I see: that's a weak stub, and there is a real implementation. I
> didn't know we could do weak stubs.
The main limitation is that it only works for your current process,
not another one. For more details you can check the git changelog
that added it (8174c430e445a93016ef18f717fe570214fa38bf)
And yes it's only faster for architectures that support it, that's
currently x86 and ppc.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-03-27 18:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-25 21:45 DRM lock ordering fix series Eric Anholt
2009-03-25 21:45 ` [PATCH 1/6] drm/i915: Fix lock order reversal in GTT pwrite path Eric Anholt
2009-03-25 21:45 ` [PATCH 2/6] drm/i915: Make GEM object's page lists refcounted instead of get/free Eric Anholt
2009-03-25 21:45 ` [PATCH 3/6] drm/i915: Fix lock order reversal in shmem pwrite path Eric Anholt
2009-03-25 21:45 ` [PATCH 4/6] drm/i915: Fix lock order reversal in shmem pread path Eric Anholt
2009-03-25 21:45 ` [PATCH 5/6] drm/i915: Fix lock order reversal with cliprects and cmdbuf in non-DRI2 paths Eric Anholt
2009-03-25 21:45 ` [PATCH 6/6] drm/i915: Fix lock order reversal in GEM relocation entry copying Eric Anholt
2009-03-30 10:00 ` [PATCH 6/6] drm/i915: Fix lock order reversal in GEM relocation entry copying. -- makes X hang Florian Mickler
2009-03-31 19:36 ` Eric Anholt
2009-04-01 0:12 ` Florian Mickler
2009-03-27 0:52 ` [PATCH 5/6] drm/i915: Fix lock order reversal with cliprects and cmdbuf in non-DRI2 paths Jesse Barnes
2009-03-25 23:30 ` [PATCH 4/6] drm/i915: Fix lock order reversal in shmem pread path Dave Airlie
2009-03-26 4:03 ` Keith Packard
2009-03-27 0:50 ` Jesse Barnes
2009-03-27 0:50 ` [PATCH 3/6] drm/i915: Fix lock order reversal in shmem pwrite path Jesse Barnes
2009-03-25 22:52 ` [PATCH 2/6] drm/i915: Make GEM object's page lists refcounted instead of get/free Dave Airlie
2009-03-26 19:59 ` Eric Anholt
2009-03-27 0:47 ` Jesse Barnes
2009-03-27 0:43 ` [PATCH 1/6] drm/i915: Fix lock order reversal in GTT pwrite path Jesse Barnes
2009-03-27 16:56 ` Eric Anholt
2009-03-27 17:07 ` Jesse Barnes
2009-03-28 0:54 ` Peter Zijlstra
2009-03-28 2:35 ` Jesse Barnes
2009-03-28 5:22 ` Dave Airlie
2009-03-27 9:34 ` DRM lock ordering fix series Andi Kleen
2009-03-27 16:19 ` Eric Anholt
2009-03-27 16:36 ` Eric Anholt
2009-03-27 18:10 ` Andi Kleen [this message]
2009-03-27 20:10 ` Eric Anholt
2009-03-27 21:05 ` Andi Kleen
2009-03-28 0:58 ` Peter Zijlstra
2009-03-28 1:29 ` Peter Zijlstra
2009-03-30 6:29 ` Eric Anholt
2009-03-28 8:46 ` Brice Goglin
2009-03-28 10:48 ` Peter Zijlstra
2009-03-28 12:22 ` [RFC] x86: gup_fast() batch limit (was: DRM lock ordering fix series) Peter Zijlstra
2009-03-28 12:46 ` Peter Zijlstra
2009-04-02 11:19 ` Nick Piggin
2009-06-24 13:46 ` [RFC] x86: gup_fast() batch limit Brice Goglin
2009-06-24 17:07 ` Peter Zijlstra
2009-06-24 19:55 ` Peter Zijlstra
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