From: Andi Kleen <ak@suse.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: taka@valinux.co.jp, linux-kernel@vger.kernel.org
Subject: Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
Date: 16 Aug 2005 15:15:35 +0200 [thread overview]
Message-ID: <p73oe7y10qw.fsf@verdi.suse.de> (raw)
In-Reply-To: <1124187950.3215.31.camel@laptopd505.fenrus.org.suse.lists.linux.kernel>
Arjan van de Ven <arjan@infradead.org> writes:
>
> not on kernel entry afaik.
> However just save the register on the stack and put it back at the
> end...
You need to do more than that, like disabling lazy FPU mode.
That is what kernel_fpu_begin/end takes care of.
However it disables preemption, which especially for bigger
copies will probably make the low latency people unhappy.
Without disabling preemption there is no way to use SSE right now.
Note that there is also an integer NT store in SSE1, however at least
in Athlon K7 it is microcoded and very slow.
-Andi
next parent reply other threads:[~2005-08-16 13:16 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20050816.131729.15816429.taka@valinux.co.jp.suse.lists.linux.kernel>
[not found] ` <20050816.135425.719901536.hyoshiok@miraclelinux.com.suse.lists.linux.kernel>
[not found] ` <1124171015.3215.0.camel@laptopd505.fenrus.org.suse.lists.linux.kernel>
[not found] ` <20050816.191617.1025215458.hyoshiok@miraclelinux.com.suse.lists.linux.kernel>
[not found] ` <1124187950.3215.31.camel@laptopd505.fenrus.org.suse.lists.linux.kernel>
2005-08-16 13:15 ` Andi Kleen [this message]
2005-08-18 11:06 ` [RFC] [PATCH] cache pollution aware __copy_from_user_ll() Hiro Yoshioka
2005-08-18 11:11 ` Hiro Yoshioka
2005-08-18 23:29 ` Hiro Yoshioka
2005-08-22 1:24 ` Hiro Yoshioka
2005-08-22 13:07 ` Andi Kleen
2005-08-22 2:43 ` Hiro Yoshioka
2005-08-22 23:12 ` Hiro Yoshioka
2005-08-24 14:11 ` Hiro Yoshioka
2005-08-24 14:21 ` Arjan van de Ven
2005-08-24 16:22 ` Hirokazu Takahashi
2005-08-25 4:53 ` Hiro Yoshioka
[not found] <20050818.201138.607962419.hyoshiok@miraclelinux.com.suse.lists.linux.kernel>
[not found] ` <98df96d30508181629d85edb5@mail.gmail.com.suse.lists.linux.kernel>
[not found] ` <20050823.081246.846946371.hyoshiok@miraclelinux.com.suse.lists.linux.kernel>
[not found] ` <20050824.231156.278740508.hyoshiok@miraclelinux.com.suse.lists.linux.kernel>
2005-08-24 16:18 ` Andi Kleen
2005-08-25 4:54 ` Hiro Yoshioka
2005-09-01 9:07 ` Hiro Yoshioka
2005-09-01 9:36 ` Andi Kleen
2005-09-02 1:43 ` Hiro Yoshioka
2005-09-02 2:06 ` Andi Kleen
2005-09-02 2:08 ` Andrew Morton
2005-09-02 2:17 ` Andi Kleen
2005-09-02 2:28 ` Andrew Morton
2005-09-02 3:41 ` Hiro Yoshioka
2005-09-02 4:29 ` Andrew Morton
2005-09-02 4:37 ` Hiro Yoshioka
2005-09-03 11:59 ` Hiro Yoshioka
2005-08-17 15:19 Chuck Ebbert
2005-08-18 9:45 ` Hiro Yoshioka
-- strict thread matches above, loose matches on Subject: below --
2005-08-16 18:09 Chuck Ebbert
2005-08-16 23:21 ` Hiro Yoshioka
2005-08-17 4:50 ` Hiro Yoshioka
[not found] <20050815121555.29159.qmail@science.horizon.com.suse.lists.linux.kernel>
[not found] ` <1124108702.3228.33.camel@laptopd505.fenrus.org.suse.lists.linux.kernel>
2005-08-15 15:02 ` Andi Kleen
2005-08-15 15:09 ` Arjan van de Ven
2005-08-15 15:13 ` Andi Kleen
2005-08-15 12:15 linux
2005-08-15 12:25 ` Arjan van de Ven
2005-08-14 21:24 Ian Kumlien
2005-08-15 7:21 ` Arjan van de Ven
2005-08-15 14:49 ` Ian Kumlien
2005-08-14 9:16 Hiro Yoshioka
2005-08-14 9:41 ` Arjan van de Ven
2005-08-14 10:22 ` Hiro Yoshioka
2005-08-14 10:35 ` Arjan van de Ven
2005-08-14 10:45 ` Christoph Hellwig
2005-08-15 6:43 ` Hiro Yoshioka
2005-08-15 7:16 ` Arjan van de Ven
2005-08-15 8:44 ` Hiro Yoshioka
2005-08-15 8:53 ` Arjan van de Ven
2005-08-15 23:33 ` Hiro Yoshioka
2005-08-16 3:30 ` Hiro Yoshioka
2005-08-16 4:17 ` Hirokazu Takahashi
2005-08-16 4:54 ` Hiro Yoshioka
2005-08-16 5:43 ` Arjan van de Ven
2005-08-16 10:16 ` Hiro Yoshioka
2005-08-16 10:19 ` Hirokazu Takahashi
2005-08-16 10:25 ` Arjan van de Ven
2005-08-16 10:24 ` Hirokazu Takahashi
2005-08-16 5:44 ` Arjan van de Ven
2005-08-16 5:49 ` Arjan van de Ven
[not found] ` <20050817.110503.97359275.taka@valinux.co.jp>
2005-08-17 5:10 ` Hiro Yoshioka
2005-08-17 14:30 ` Akira Tsukamoto
2005-08-17 15:27 ` Akira Tsukamoto
2005-08-18 17:53 ` Lee Revell
2005-08-18 2:37 ` Akira Tsukamoto
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