From: Andi Kleen <andi@firstfloor.org>
To: Avi Kivity <avi@redhat.com>
Cc: Takuya Yoshikawa <takuya.yoshikawa@gmail.com>,
mtosatti@redhat.com, kvm@vger.kernel.org,
yoshikawa.takuya@oss.ntt.co.jp
Subject: Re: [RFC PATCH 3/3] KVM: MMU: Optimize guest page table walk
Date: Thu, 28 Apr 2011 19:46:00 -0700 [thread overview]
Message-ID: <m2liyt3hcn.fsf@firstfloor.org> (raw)
In-Reply-To: <4DAEA123.3020403@redhat.com> (Avi Kivity's message of "Wed, 20 Apr 2011 12:02:27 +0300")
Avi Kivity <avi@redhat.com> writes:
>
> Good optimization. copy_from_user() really isn't optimized for short
> buffers, I expect much of the improvement comes from that.
Actually it is equivalent to get_user for the lenghts supported by
get_user, assuming you pass in a constant length. You probably do not.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2011-04-29 2:46 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-18 18:32 [PATCH 1/3] KVM: Introduce a helper to check if gfn is in memslot Takuya Yoshikawa
2011-04-18 18:34 ` [PATCH 2/3] KVM: MMU: Introduce a helper to read guest pte Takuya Yoshikawa
2011-04-20 9:07 ` Avi Kivity
2011-04-20 9:35 ` Roedel, Joerg
2011-04-20 10:05 ` Avi Kivity
2011-04-20 11:06 ` Roedel, Joerg
2011-04-20 11:18 ` Avi Kivity
2011-04-20 13:33 ` [PATCH] KVM: MMU: Make cmpxchg_gpte aware of nesting too Roedel, Joerg
2011-04-21 1:02 ` Takuya Yoshikawa
2011-04-21 8:11 ` Avi Kivity
2011-04-21 1:07 ` [PATCH 2/3] KVM: MMU: Introduce a helper to read guest pte Takuya Yoshikawa
2011-04-18 18:38 ` [RFC PATCH 3/3] KVM: MMU: Optimize guest page table walk Takuya Yoshikawa
2011-04-18 18:52 ` Joerg Roedel
2011-04-19 1:24 ` Takuya Yoshikawa
2011-04-19 6:20 ` Joerg Roedel
2011-04-19 1:42 ` Xiao Guangrong
2011-04-19 3:47 ` Takuya Yoshikawa
2011-04-20 9:09 ` Avi Kivity
2011-04-20 9:02 ` Avi Kivity
2011-04-29 2:46 ` Andi Kleen [this message]
2011-04-29 5:38 ` Takuya Yoshikawa
2011-04-29 6:30 ` Takuya Yoshikawa
2011-04-29 6:59 ` Andi Kleen
2011-04-29 13:51 ` Takuya Yoshikawa
2011-04-29 16:05 ` Andi Kleen
2011-05-01 13:32 ` Avi Kivity
2011-05-01 20:51 ` Andi Kleen
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