linux-kernel - Re: balance storm

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Message-ID: <53844277.3050204@huawei.com>
Date:	Tue, 27 May 2014 15:44:55 +0800
From:	Libo Chen <libo.chen@...wei.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
CC:	<tglx@...utronix.de>, <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"Li Zefan" <lizefan@...wei.com>, <peterz@...radead.org>
Subject: Re: balance storm

On 2014/5/26 22:03, Mike Galbraith wrote:
> On Mon, 2014-05-26 at 19:49 +0800, Libo Chen wrote:
> 
>> how to turn off SD_SHARE_PKG_RESOURCES in userspace ?
> 
> I use a script Ingo gave me years and years ago to
> twiddle /proc/sys/kernel/sched_domain/cpuN/domainN/flags domain wise.
> Doing that won't do you any good without a handler to build/tear down
> sd_llc when you poke at flags though.  You can easily add a sched
> feature to play with it.


I make a simple script：

   for ((i=0;i<=15;i++))
   do
           echo 4143 > /proc/sys/kernel/sched_domain/cpu$i/domain1/flags
   done

In our kernel  SD_SHARE_PKG_RESOURCE is 0x0200, the original flag value is 4655,
domain1's name is MC.

but migrations event doesn't reduce like yours, what problem?  I wouldn't like
recompile kernel :(


> 
> -Mike
> 
> 
> 


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