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|---|---|
| From | Wanpeng Li <kernellwp@gmail.com> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 0/2] x86/idle: add halt poll support |
| Date | Thu, 22 Jun 2017 14:00:03 +0200 |
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| X-Original-Cc | Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, Paolo Bonzini <pbonzini@redhat.com>, "the arch/x86 maintainers" <x86@kernel.org>, Jonathan Corbet <corbet@lwn.net>, tony.luck@intel.com, Borislav Petkov <bp@alien8.de>, Peter Zijlstra <peterz@infradead.org>, mchehab@kernel.org, Andrew Morton <akpm@linux-foundation.org>, krzk@kernel.org, jpoimboe@redhat.com, Andy Lutomirski <luto@kernel.org>, Christian Borntraeger <borntraeger@de.ibm.com>, thgarnie@google.com, rgerst@gmail.com, minipli@googlemail.com, douly.fnst@cn.fujitsu.com, nicstange@gmail.com, Frederic Weisbecker <fweisbec@gmail.com>, dvlasenk@redhat.com, Daniel Bristot de Oliveira <bristot@redhat.com>, yamada.masahiro@socionext.com, mika.westerberg@linux.intel.com, Chen Yu <yu.c.chen@intel.com>, aaron.lu@intel.com, Steven Rostedt <rostedt@goodmis.org>, me@kylehuey.com, Len Brown <len.brown@intel.com>, Prarit Bhargava <prarit@redhat.com>, hidehiro.kawai.ez@hitachi.com, fengtiantian@huawei.com, pmladek@suse.com, jeyu@redhat.com, Larry.Finger@lwfinger.net, zijun_hu@htc.com, luisbg@osg.samsung.com, johannes.berg@intel.com, niklas.soderlund+renesas@ragnatech.se, zlpnobody@gmail.com, adobriyan@gmail.com, fgao@ikuai8.com, ebiederm@xmission.com, subashab@codeaurora.org, arnd@arndb.de, Matt Fleming <matt@codeblueprint.co.uk>, Mel Gorman <mgorman@techsingularity.net>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, linux-doc@vger.kernel.org, linux-edac@vger.kernel.org, kvm <kvm@vger.kernel.org> |
| X-Original-Date | Thu, 22 Jun 2017 19:50:02 +0800 |
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2017-06-22 19:22 GMT+08:00 root <yang.zhang.wz@gmail.com>: > From: Yang Zhang <yang.zhang.wz@gmail.com> > > Some latency-intensive workload will see obviously performance > drop when running inside VM. The main reason is that the overhead > is amplified when running inside VM. The most cost i have seen is > inside idle path. > This patch introduces a new mechanism to poll for a while before > entering idle state. If schedule is needed during poll, then we > don't need to goes through the heavy overhead path. > > Here is the data i get when running benchmark contextswitch > (https://github.com/tsuna/contextswitch) > before patch: > 2000000 process context switches in 4822613801ns (2411.3ns/ctxsw) > after patch: > 2000000 process context switches in 3584098241ns (1792.0ns/ctxsw) If you test this after disabling the adaptive halt-polling in kvm? What's the performance data of w/ this patchset and w/o the adaptive halt-polling in kvm, and w/o this patchset and w/ the adaptive halt-polling in kvm? In addition, both linux and windows guests can get benefit as we have already done this in kvm. Regards, Wanpeng Li > Yang Zhang (2): > x86/idle: add halt poll for halt idle > x86/idle: use dynamic halt poll > > Documentation/sysctl/kernel.txt | 24 ++++++++++ > arch/x86/include/asm/processor.h | 6 +++ > arch/x86/kernel/apic/apic.c | 6 +++ > arch/x86/kernel/apic/vector.c | 1 + > arch/x86/kernel/cpu/mcheck/mce_amd.c | 2 + > arch/x86/kernel/cpu/mcheck/therm_throt.c | 2 + > arch/x86/kernel/cpu/mcheck/threshold.c | 2 + > arch/x86/kernel/irq.c | 5 ++ > arch/x86/kernel/irq_work.c | 2 + > arch/x86/kernel/process.c | 80 ++++++++++++++++++++++++++++++++ > arch/x86/kernel/smp.c | 6 +++ > include/linux/kernel.h | 5 ++ > kernel/sched/idle.c | 3 ++ > kernel/sysctl.c | 23 +++++++++ > 14 files changed, 167 insertions(+) > > -- > 1.8.3.1 >
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[PATCH 0/2] x86/idle: add halt poll support root <yang.zhang.wz@gmail.com> - 2017-06-22 13:30 +0200
[PATCH 1/2] x86/idle: add halt poll for halt idle root <yang.zhang.wz@gmail.com> - 2017-06-22 13:30 +0200
Re: [PATCH 1/2] x86/idle: add halt poll for halt idle Thomas Gleixner <tglx@linutronix.de> - 2017-06-22 16:30 +0200
Re: [PATCH 1/2] x86/idle: add halt poll for halt idle Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-23 06:10 +0200
[PATCH 2/2] x86/idle: use dynamic halt poll root <yang.zhang.wz@gmail.com> - 2017-06-22 13:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Paolo Bonzini <pbonzini@redhat.com> - 2017-06-22 14:00 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-23 06:00 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-27 13:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Paolo Bonzini <pbonzini@redhat.com> - 2017-06-27 14:10 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Wanpeng Li <kernellwp@gmail.com> - 2017-06-27 14:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Paolo Bonzini <pbonzini@redhat.com> - 2017-06-27 14:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Radim Krčmář <rkrcmar@redhat.com> - 2017-06-27 15:50 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Paolo Bonzini <pbonzini@redhat.com> - 2017-06-27 16:00 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Paolo Bonzini <pbonzini@redhat.com> - 2017-06-27 16:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Radim Krčmář <rkrcmar@redhat.com> - 2017-06-27 16:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Yang Zhang <yang.zhang.wz@gmail.com> - 2017-07-03 11:30 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Thomas Gleixner <tglx@linutronix.de> - 2017-07-03 12:10 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Thomas Gleixner <tglx@linutronix.de> - 2017-06-22 16:40 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-23 06:10 +0200
Re: [PATCH 2/2] x86/idle: use dynamic halt poll kbuild test robot <lkp@intel.com> - 2017-06-23 00:50 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-22 13:40 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Wanpeng Li <kernellwp@gmail.com> - 2017-06-22 14:00 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-23 06:10 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Wanpeng Li <kernellwp@gmail.com> - 2017-06-23 06:40 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Yang Zhang <yang.zhang.wz@gmail.com> - 2017-06-23 08:50 +0200
Re: [PATCH 0/2] x86/idle: add halt poll support Radim Krčmář <rkrcmar@redhat.com> - 2017-06-27 16:10 +0200
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