Messages in this thread | | | Date | Tue, 19 Nov 2002 20:18:25 +0100 | From | Manfred Spraul <> | Subject | Re: Performance improvement with Akira Tsukamoto's Athlon copy_user patch |
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>I read the code of laze FPU state saving and confirmed that >if the function does not generate exception than >'kernel_fpu_begin/end()' should assure fpu safe inside kernel. > >However, it is not enough where exception could rise, as Takahashi >mentioned.
I had prototyped an exception safe kfpu framework, but then I didn't have the time to submit/cleanup it.
http://www.colorfullife.com/~manfred/linux-2.5/sse/patch-kfpu
Have you tried SSE based copy_to_user? With SSE, you can just save the affected registers, without unexpected sideeffects.
-- Manfred
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