On Tue, 2006-05-02 at 07:50 -0700, Raj, Ashok wrote: > Yes, cpu0 was not offlineable since inception. (both in x86 and x86_64) > due to certain other dependencies that would need more cleanup in kernel > code. > > Even though you had an online file earlier, its was a no-op.. basically > when you echo 1 to offline to cpu0, we just returned error and did > nothing. So that means that an implementation _can have an online file, even though the corresponding cpu is not able to offline. Sounds like having an online file in sysfs isn't a sure indication of an "off-lineable" cpu after all. -Mary > > Cheers, > ashok raj > - Open Source Technology Center > > > >-----Original Message----- > >From: Bryce Harrington [mailto:bryce@xxxxxxxx] > >Sent: Monday, May 01, 2006 5:38 PM > >To: Raj, Ashok > >Cc: Mary Edie Meredith; Hotplug SIG; lhcs-devel@xxxxxxxxxxxxxxxxxxxxx > >Subject: Hotplug CPU issue? > > > >On Tue, Apr 11, 2006 at 10:47:16AM -0700, Raj, Ashok wrote: > >> > >> > > >> > * Patch to fix the CPU issue we discovered with the > lhcs_regression > >> > testsuite has been validated to fix the issue. > >> > > >> > >> > >> Yes this patch is now included in mainline. > > > >Hi ashok, > > > >Thanks, I verified this is now working in mainline kernels. However > >I've noticed a new issue. > > > >I've been running my CPU hotplug regression test against recent -rc, > >-mm, and -git kernels, on a 2-cpu machine. But I notice that while > cpu1 > >can be onlined/offlined, cpu0 cannot. This is because there is no > >'online' file for cpu0: > > > > cl009 cpu # ls /sys/devices/system/cpu/cpu* > > /sys/devices/system/cpu/cpu0: > > topology > > > > /sys/devices/system/cpu/cpu1: > > online topology > > > >Why would I be seeing the online file only for cpu1? Is x86 incapable > >of offlining cpu0? > > > >Thanks, > >Bryce > -- Mary Edie Meredith Initiative Manager Open Source Development Labs maryedie@xxxxxxxx 503-906-1942
