From: Peter Zijlstra <peterz@infradead.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
gleb@kernel.org, kvm@vger.kernel.org,
Ralf Baechle <ralf@linux-mips.org>,
mtosatti@redhat.com, luto@kernel.org
Subject: Re: [GIT PULL] First batch of KVM changes for 4.1
Date: Fri, 17 Apr 2015 15:43:35 +0200 [thread overview]
Message-ID: <20150417134335.GI23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <55310CF2.6070107@redhat.com>
On Fri, Apr 17, 2015 at 03:38:58PM +0200, Paolo Bonzini wrote:
> > The path this notifier is called from has nothing to do with those
> > costs.
>
> How not? The task is going to incur those costs, it's not like half
> a dozen extra instruction make any difference. But anyway...
Its attributed to the entity doing the migration, which can be the
wakeup path or a softirq. And we very much do care about the wakeup
path.
> ... that's a valid objection. Please look at the patch below.
Still a NAK on that, distros have no choice but to enable that CONFIG
option because people might want to run KVM.
CONFIG options are pointless if they end up being mandatory.
next prev parent reply other threads:[~2015-04-17 13:43 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-10 15:01 [GIT PULL] First batch of KVM changes for 4.1 Paolo Bonzini
2015-04-17 8:52 ` Peter Zijlstra
2015-04-17 9:17 ` Peter Zijlstra
2015-04-17 10:09 ` Paolo Bonzini
2015-04-17 10:36 ` Peter Zijlstra
2015-04-17 10:38 ` Paolo Bonzini
2015-04-17 10:55 ` Peter Zijlstra
2015-04-17 12:46 ` Paolo Bonzini
2015-04-17 13:10 ` Peter Zijlstra
2015-04-17 13:38 ` Paolo Bonzini
2015-04-17 13:43 ` Peter Zijlstra [this message]
2015-04-17 14:57 ` Paolo Bonzini
2015-04-17 19:01 ` Marcelo Tosatti
2015-04-17 19:16 ` Andy Lutomirski
2015-04-17 19:57 ` Paolo Bonzini
2015-04-17 20:18 ` Marcelo Tosatti
2015-04-17 20:39 ` Andy Lutomirski
2015-04-17 21:28 ` Linus Torvalds
2015-04-17 21:42 ` Andy Lutomirski
2015-04-17 22:04 ` Linus Torvalds
2015-04-17 22:25 ` Andy Lutomirski
2015-04-17 23:39 ` Marcelo Tosatti
2015-04-18 16:20 ` Paolo Bonzini
2015-04-20 16:59 ` Paolo Bonzini
2015-04-20 20:27 ` Andy Lutomirski
2015-04-22 21:21 ` Marcelo Tosatti
2015-04-23 9:13 ` Paolo Bonzini
2015-04-23 11:51 ` Marcelo Tosatti
2015-04-23 12:02 ` Paolo Bonzini
2015-04-23 17:06 ` Marcelo Tosatti
2015-04-22 20:56 ` Marcelo Tosatti
2015-04-22 21:01 ` Paolo Bonzini
2015-04-22 22:55 ` Marcelo Tosatti
2015-04-23 11:29 ` Paolo Bonzini
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