From: Peter Zijlstra <peterz@infradead.org>
To: Quan Xu <quan.xu03@gmail.com>
Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, x86@kernel.org,
xen-devel@lists.xenproject.org,
Yang Zhang <yang.zhang.wz@gmail.com>,
Quan Xu <quan.xu0@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Borislav Petkov <bp@alien8.de>, Kyle Huey <me@kylehuey.com>,
Len Brown <len.brown@intel.com>,
Andy Lutomirski <luto@kernel.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Tobias Klauser <tklauser@distanz.ch>
Subject: Re: [PATCH RFC v3 3/6] sched/idle: Add a generic poll before enter real idle path
Date: Wed, 15 Nov 2017 13:11:52 +0100 [thread overview]
Message-ID: <20171115121152.gqug5wzerlo3eimd@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1510567565-5118-4-git-send-email-quan.xu0@gmail.com>
On Mon, Nov 13, 2017 at 06:06:02PM +0800, Quan Xu wrote:
> From: Yang Zhang <yang.zhang.wz@gmail.com>
>
> Implement a generic idle poll which resembles the functionality
> found in arch/. Provide weak arch_cpu_idle_poll function which
> can be overridden by the architecture code if needed.
No, we want less of those magic hooks, not more.
> Interrupts arrive which may not cause a reschedule in idle loops.
> In KVM guest, this costs several VM-exit/VM-entry cycles, VM-entry
> for interrupts and VM-exit immediately. Also this becomes more
> expensive than bare metal. Add a generic idle poll before enter
> real idle path. When a reschedule event is pending, we can bypass
> the real idle path.
Why not do a HV specific idle driver?
next prev parent reply other threads:[~2017-11-15 12:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1510567565-5118-1-git-send-email-quan.xu0@gmail.com>
[not found] ` <1510567565-5118-2-git-send-email-quan.xu0@gmail.com>
2017-11-13 10:53 ` [PATCH RFC v3 1/6] x86/paravirt: Add pv_idle_ops to paravirt ops Juergen Gross
2017-11-13 11:09 ` Wanpeng Li
2017-11-14 7:02 ` Quan Xu
2017-11-14 7:12 ` Wanpeng Li
2017-11-14 8:15 ` Quan Xu
2017-11-14 8:22 ` Wanpeng Li
2017-11-14 10:23 ` Quan Xu
2017-11-14 7:30 ` Juergen Gross
2017-11-14 9:38 ` Quan Xu
2017-11-14 10:27 ` Juergen Gross
2017-11-14 11:43 ` Quan Xu
2017-11-14 11:58 ` Juergen Gross
[not found] ` <1510567565-5118-4-git-send-email-quan.xu0@gmail.com>
2017-11-15 12:11 ` Peter Zijlstra [this message]
2017-11-15 22:03 ` [PATCH RFC v3 3/6] sched/idle: Add a generic poll before enter real idle path Thomas Gleixner
2017-11-16 8:45 ` Peter Zijlstra
2017-11-16 8:58 ` Thomas Gleixner
2017-11-16 9:29 ` Quan Xu
2017-11-16 9:47 ` Thomas Gleixner
2017-11-16 9:12 ` Quan Xu
2017-11-16 9:45 ` Daniel Lezcano
2017-11-20 7:05 ` Quan Xu
2017-11-20 18:01 ` Daniel Lezcano
2017-11-16 9:53 ` Thomas Gleixner
2017-11-17 11:23 ` Quan Xu
2017-11-17 11:36 ` Thomas Gleixner
2017-11-17 12:21 ` Quan Xu
2017-11-15 21:31 ` [Xen-devel] [PATCH RFC v3 0/6] x86/idle: add halt poll support Konrad Rzeszutek Wilk
2017-11-20 7:18 ` Quan Xu
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