From: Avi Kivity <avi@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
"H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [PATCH v2] core, x86: Add user return notifiers
Date: Tue, 22 Sep 2009 17:45:05 +0300 [thread overview]
Message-ID: <4AB8E2F1.6030401@redhat.com> (raw)
In-Reply-To: <20090922143223.GA31702@elte.hu>
On 09/22/2009 05:32 PM, Ingo Molnar wrote:
> * Avi Kivity<avi@redhat.com> wrote:
>
>
>> On 09/19/2009 09:40 AM, Avi Kivity wrote:
>>
>>> Add a general per-cpu notifier that is called whenever the kernel is
>>> about to return to userspace. The notifier uses a thread_info flag
>>> and existing checks, so there is no impact on user return or context
>>> switch fast paths.
>>>
>>>
>> Ingo/Peter?
>>
> Would be nice to convert some existing open-coded return-to-user-space
> logic to this facility. One such candidate would be lockdep_sys_exit?
>
I only implemented this for x86, while lockdep is arch independent. If
arch support is added, it should be trivial.
I think perf counters could use preempt notifiers though, these are arch
independent.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-09-22 14:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-16 12:45 [PATCH 0/4] User return notifiers / just-in-time MSR switching for KVM Avi Kivity
2009-09-16 12:45 ` [PATCH 1/4] core, x86: Add user return notifiers Avi Kivity
2009-09-18 18:14 ` H. Peter Anvin
2009-09-19 6:40 ` [PATCH v2] " Avi Kivity
2009-09-22 9:25 ` Avi Kivity
2009-09-22 9:37 ` Arjan van de Ven
2009-09-22 9:48 ` Avi Kivity
2009-09-22 14:32 ` Ingo Molnar
2009-09-22 14:45 ` Avi Kivity [this message]
2009-09-22 15:50 ` Avi Kivity
2009-09-22 17:08 ` Avi Kivity
2009-09-22 15:19 ` H. Peter Anvin
2009-10-01 15:21 ` Avi Kivity
2009-10-01 15:25 ` H. Peter Anvin
2009-10-01 15:30 ` Avi Kivity
2009-10-01 18:33 ` H. Peter Anvin
2009-09-22 16:50 ` Peter Zijlstra
2009-09-22 16:52 ` Avi Kivity
2009-09-22 16:55 ` Peter Zijlstra
2009-09-22 17:05 ` Avi Kivity
2009-09-22 18:06 ` Peter Zijlstra
2009-11-02 10:12 ` [tip:x86/entry] " tip-bot for Avi Kivity
2009-09-19 6:40 ` [PATCH 1/4] " Avi Kivity
2009-09-16 12:45 ` [PATCH 2/4] KVM: VMX: Move MSR_KERNEL_GS_BASE out of the vmx autoload msr area Avi Kivity
2009-09-16 12:45 ` [PATCH 3/4] KVM: x86 shared msr infrastructure Avi Kivity
2009-09-16 21:21 ` Marcelo Tosatti
2009-09-16 21:24 ` Avi Kivity
2009-09-16 12:45 ` [PATCH 4/4] KVM: VMX: Use " Avi Kivity
2009-10-25 12:23 ` [PATCH 0/4] User return notifiers / just-in-time MSR switching for KVM Avi Kivity
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