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
| ||
|
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/
Powered by blists - more mailing lists