linux-kernel - Re: [PATCH] x86: Optimize tail handling for copy

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Message-ID: <m3wsj0l7cv.fsf@gravicappa.englab.brq.redhat.com>
Date:	Sat, 02 Aug 2008 00:04:48 +0200
From:	Vitaly Mayatskikh <v.mayatskih@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Vitaly Mayatskikh <v.mayatskih@...il.com>,
	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: Optimize tail handling for copy_user

Linus Torvalds <torvalds@...ux-foundation.org> writes:

>> Yes, I see. I was messed, sorry. Your BYTES_LEFT_IN_PAGE works very
>> well, tested.
>> 
>> Signed-off-by: Vitaly Mayatskikh <v.mayatskih@...il.com>
>
> Ok, this latest version _looks_ ok. How well tested is it? I'm a bit 
> nervous by now. Those earlier versions that got committed had all those 
> wrone registers etc.
>
> Anyway, Ack as far as I'm concerned, but..

Well, I have sanity test for it (at http://people.redhat.com/vmayatsk/copy_user_x8664/), 
but unfortunately it shows what I want to see, not the truth. I'm going
to make a large regression testing next week.

-- 
wbr, Vitaly
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