Messages in this thread | | | Subject | Re: DRM lock ordering fix series | From | Andi Kleen <> | Date | Fri, 27 Mar 2009 10:34:30 +0100 |
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Eric Anholt <eric@anholt.net> writes:
> Here's hopefully the final attempt at the lock ordering fix for GEM. The > problem was introduced in .29 with the GTT mapping support. We hashed out > a few potential fixes on the mailing list and at OSTS. Peter's plan was > to use get_user_pages, but it has significant CPU overhead (10% cost to text > rendering, though part of that is due to some dumb userland code. But it's > dumb userland code we're all running).
You are aware that there is a fast path now (get_user_pages_fast) which is significantly faster? (but has some limitations)
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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