linux-kernel - RE: [8/8,v3] NUMA Hotplug Emulator: documentation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <789F9655DD1B8F43B48D77C5D30659732FE95E71@shsmsx501.ccr.corp.intel.com>
Date:	Sun, 21 Nov 2010 23:16:57 +0800
From:	"Li, Haicheng" <haicheng.li@...el.com>
To:	Américo Wang <xiyou.wangcong@...il.com>,
	"Zheng, Shaohui" <shaohui.zheng@...el.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"haicheng.li@...ux.intel.com" <haicheng.li@...ux.intel.com>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"shaohui.zheng@...ux.intel.com" <shaohui.zheng@...ux.intel.com>
Subject: RE: [8/8,v3] NUMA Hotplug Emulator: documentation

Américo Wang wrote:
> On Wed, Nov 17, 2010 at 10:08:07AM +0800, shaohui.zheng@...el.com
> wrote: 
>> +2) CPU hotplug emulation:
>> +
>> +The emulator reserve CPUs throu grub parameter, the reserved CPUs
>> can be +hot-add/hot-remove in software method, it emulates the
>> process of physical +cpu hotplug. +
>> +When hotplug a CPU with emulator, we are using a logical CPU to
>> emulate the CPU +socket hotplug process. For the CPU supported SMT,
>> some logical CPUs are in the +same socket, but it may located in
>> different NUMA node after we have emulator. +We put the logical CPU
>> into a fake CPU socket, and assign it an unique +phys_proc_id. For
>> the fake socket, we put one logical CPU in only. + + - to hide CPUs
>> +	- Using boot option "maxcpus=N" hide CPUs
>> +	  N is the number of initialize CPUs
>> +	- Using boot option "cpu_hpe=on" to enable cpu hotplug emulation
>> +      when cpu_hpe is enabled, the rest CPUs will not be
>> initialized + + - to hot-add CPU to node
>> +	$ echo nid > cpu/probe
>> +
>> + - to hot-remove CPU
>> +	$ echo nid > cpu/release
>> +
> 
> Again, we already have software CPU hotplug,
> i.e. /sys/devices/system/cpu/cpuX/online.

online here is just for logical CPU online. what we're achieving here is to emulate physical CPU hotadd.


-haicheng--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/