From: Christoph Hellwig <hch@infradead.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: hyoshiok@miraclelinux.com, linux-kernel@vger.kernel.org
Subject: Re: [RFC] [PATCH] cache pollution aware __copy_from_user_ll()
Date: Sun, 14 Aug 2005 11:45:33 +0100 [thread overview]
Message-ID: <20050814104533.GA16936@infradead.org> (raw)
In-Reply-To: <1124015743.3222.17.camel@laptopd505.fenrus.org>
> the problem is that the pay elsewhere is far more spread out, but not
> less. At least generally....
>
> I can see the point of a copy_from_user_nocache() or something, for
> those cases where we *know* we are not going to use the copied data in
> the cpu (but say, only do DMA).
> But that should be explicit, not implicit, since the general case will
> be that the kernel WILL use the data.
Most of the callers probably want the normal one, but most of the copied
data (buffered filesystem I/O) will want the non cache poluting one.
So yes, doing this explicit makes a lot of sense.
next prev parent reply other threads:[~2005-08-14 10:45 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-14 9:16 [RFC] [PATCH] cache pollution aware __copy_from_user_ll() 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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2005-08-14 21:24 Ian Kumlien
2005-08-15 7:21 ` Arjan van de Ven
2005-08-15 14:49 ` Ian Kumlien
2005-08-15 12:15 linux
2005-08-15 12:25 ` Arjan van de Ven
[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
[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
2005-08-18 11:06 ` 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
2005-08-16 18:09 Chuck Ebbert
2005-08-16 23:21 ` Hiro Yoshioka
2005-08-17 4:50 ` Hiro Yoshioka
2005-08-17 15:19 Chuck Ebbert
2005-08-18 9:45 ` 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
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