From sankar.16 at gmail.com Sun Jan 3 02:26:47 2010 From: sankar.16 at gmail.com (Sankar) Date: Sat, 2 Jan 2010 20:26:47 -0600 Subject: CPU hotplug Message-ID: Currently the cpu hotplug (bringing the cpu to online/offline state) operations are serialized. I was trying to check the possibilities if certain things can be done in parallel here. (like if tried to bring down two processors at the same moment) In the cpu offline path, a call is made to __stop_machine (whose description say : This causes a thread to be scheduled on every cpu, each of which disables interrupts. The result is that noone is holding a spinlock or inside any other preempt-disabled region when @fn() runs. This function assumes cpus won't come or go while it's being called. Used by hotplug cpu.) take_cpu_down (which disables the local apic, makes modifications in the ioapic redirection vector table, modifies the state of the cpu maps, sends CPU_DYING to registered callbacks and finally schedules the idle thread) is the function that gets executed in the target cpu (i.e. the cpu that goes offline) during this entire system halt state. I am trying to understand the main reason for using stop_machine to run take_cpu_down. What are all the main operations done that expects this state of system? Is it because of the cpu maps (which are mostly readonly) getting modified or the modifications to IOAPIC redirection vector table entries? Thanks Sankar From ngaywood at une.edu.au Sun Jan 3 14:03:30 2010 From: ngaywood at une.edu.au (Norman Gaywood) Date: Mon, 4 Jan 2010 01:03:30 +1100 Subject: Fedora 11/12 kernels as xen domU Message-ID: <20100103140330.GA13781@turing.une.edu.au> [Originally sent this to fedora-list but thought it may get more attention here.] Is anyone having any stability with the fedora kernels running as a Xen DomU. Dom0 is a Centos 5.4 2.6.18-164.9.1.el5xen kernel. These fedora kernels seem to lockup (processes get stuck in D state) whenever put under any load: kernel-2.6.30.10-105.fc11.x86_64 kernel-2.6.31.6-166.fc12.x86_64 kernel-2.6.31.9-174.fc12.x86_64 Yes, I tried a fedora 11 kernel on a fedora 12 system. This is the most stable for me. Here are some bugzilla entries (one posted by me) that point to this problem: kernel 2.6.31 processes lock up in D state https://bugzilla.redhat.com/show_bug.cgi?id=550724 FC12 2.6.31.9-174.fc12.x86_64 hangs under heavy disk I/O https://bugzilla.redhat.com/show_bug.cgi?id=551552 -- Norman Gaywood, Computer Systems Officer University of New England, Armidale, NSW 2351, Australia ngaywood at une.edu.au Phone: +61 (0)2 6773 3337 http://mcs.une.edu.au/~norm Fax: +61 (0)2 6773 3312 Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html From kmcmartin at redhat.com Mon Jan 4 14:24:06 2010 From: kmcmartin at redhat.com (Kyle McMartin) Date: Mon, 4 Jan 2010 09:24:06 -0500 Subject: tagged for 2.6.32 Message-ID: <20100104142406.GG2531@ihatethathostname.lab.bos.redhat.com> So we're moving to 2.6.32 across F-11 & F-12, as such I've tagged the old kernels on those branches. F-11 2.6.30 is on branch private-fedora-11-2_6_30 F-12 2.6.31 is on branch private-fedora-12-2_6_31 The devel/ sources from 2.6.32 are on private-rawhide-2_6_32. Kyle. From sgruszka at redhat.com Tue Jan 5 07:40:01 2010 From: sgruszka at redhat.com (Stanislaw Gruszka) Date: Tue, 5 Jan 2010 08:40:01 +0100 Subject: What happens with cvs.fedora.redhat.com Message-ID: <20100105074000.GA3072@dhcp-lab-161.englab.brq.redhat.com> What happens with cvs.fedora.redhat.com? If it is shutdown permanently where I can get current fedora kernel sources? Stanislaw From dwmw2 at infradead.org Tue Jan 5 07:50:47 2010 From: dwmw2 at infradead.org (David Woodhouse) Date: Tue, 05 Jan 2010 07:50:47 +0000 Subject: What happens with cvs.fedora.redhat.com In-Reply-To: <20100105074000.GA3072@dhcp-lab-161.englab.brq.redhat.com> References: <20100105074000.GA3072@dhcp-lab-161.englab.brq.redhat.com> Message-ID: <1262677847.3181.7122.camel@macbook.infradead.org> On Tue, 2010-01-05 at 08:40 +0100, Stanislaw Gruszka wrote: > What happens with cvs.fedora.redhat.com? If it is shutdown > permanently where I can get current fedora kernel sources? cvs.fedoraproject.org -- David Woodhouse Open Source Technology Centre David.Woodhouse at intel.com Intel Corporation From sgruszka at redhat.com Tue Jan 5 08:06:20 2010 From: sgruszka at redhat.com (Stanislaw Gruszka) Date: Tue, 5 Jan 2010 09:06:20 +0100 Subject: What happens with cvs.fedora.redhat.com In-Reply-To: <1262677847.3181.7122.camel@macbook.infradead.org> References: <20100105074000.GA3072@dhcp-lab-161.englab.brq.redhat.com> <1262677847.3181.7122.camel@macbook.infradead.org> Message-ID: <20100105090620.7ed11368@dhcp-lab-109.englab.brq.redhat.com> On Tue, 05 Jan 2010 07:50:47 +0000 David Woodhouse wrote: > On Tue, 2010-01-05 at 08:40 +0100, Stanislaw Gruszka wrote: > > What happens with cvs.fedora.redhat.com? If it is shutdown > > permanently where I can get current fedora kernel sources? > > cvs.fedoraproject.org Thanks, I've updateed https://fedoraproject.org/wiki/Kernel with that info. Stanislaw