Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

Hi Greg, et alia, On Tue, Dec 13, 2022 at 03:31:06PM +0100 Greg Kroah-Hartman wrote: > On Tue, Dec 13, 2022 at 08:22:58AM -0500, Phil Auld wrote: > > > > > > The idea seems good, the implementation might need a bit of work :) > > > > More than the one comment below? Let me know. > > No idea, r

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Wed, Dec 14, 2022 at 10:41:25AM +1100 Michael Ellerman wrote: > Phil Auld writes: > > On Tue, Dec 13, 2022 at 07:23:54AM +0100 Greg Kroah-Hartman wrote: > >> On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: > >> > Hi, > >> > > >> > On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

Phil Auld writes: > On Tue, Dec 13, 2022 at 07:23:54AM +0100 Greg Kroah-Hartman wrote: >> On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: >> > Hi, >> > >> > On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-Hartman wrote: >> > > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Choura

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Dec 13, 2022 at 03:31:06PM +0100 Greg Kroah-Hartman wrote: > On Tue, Dec 13, 2022 at 08:22:58AM -0500, Phil Auld wrote: > > On Tue, Dec 13, 2022 at 07:23:54AM +0100 Greg Kroah-Hartman wrote: > > > On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: > > > > Hi, > > > > > > > > On Tue

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Dec 13, 2022 at 08:22:58AM -0500, Phil Auld wrote: > On Tue, Dec 13, 2022 at 07:23:54AM +0100 Greg Kroah-Hartman wrote: > > On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: > > > Hi, > > > > > > On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-Hartman wrote: > > > > On Tue, No

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Dec 13, 2022 at 07:23:54AM +0100 Greg Kroah-Hartman wrote: > On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: > > Hi, > > > > On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-Hartman wrote: > > > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: > > > > > > >

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Mon, Dec 12, 2022 at 02:17:58PM -0500, Phil Auld wrote: > Hi, > > On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-Hartman wrote: > > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: > > > > > > Thanks Greg & Peter for your direction. > > > > > > While we pursue the idea

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

Hi, On Tue, Nov 08, 2022 at 01:24:39PM +0100 Greg Kroah-Hartman wrote: > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: > > > > Thanks Greg & Peter for your direction. > > > > While we pursue the idea of having debugfs based on kernfs, we thought about > > having a boot time

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Nov 08, 2022 at 08:21:00PM +0530, Srikar Dronamraju wrote: > * Greg Kroah-Hartman [2022-11-08 13:24:39]: > > > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: > > Hi Greg, > > > > > > > Thanks Greg & Peter for your direction. > > > > > > While we pursue the idea of

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

* Greg Kroah-Hartman [2022-11-08 13:24:39]: > On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: Hi Greg, > > > > Thanks Greg & Peter for your direction. > > > > While we pursue the idea of having debugfs based on kernfs, we thought about > > having a boot time parameter whic

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Nov 08, 2022 at 03:30:46PM +0530, Vishal Chourasia wrote: > > Thanks Greg & Peter for your direction. > > While we pursue the idea of having debugfs based on kernfs, we thought about > having a boot time parameter which would disable creating and updating of the > sched_domain debugfs fi

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

Thanks Greg & Peter for your direction. While we pursue the idea of having debugfs based on kernfs, we thought about having a boot time parameter which would disable creating and updating of the sched_domain debugfs files and this would also be useful even when the kernfs solution kicks in, as u

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Oct 18, 2022 at 01:04:40PM +0200, Greg Kroah-Hartman wrote: > Why do you need to? What tools require these debugfs files to be > present? We are not entirely sure what applications (if any) might be using this interface. > And if you only have 7-8 files per CPU, that does not seem like

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Wed, Oct 26, 2022 at 09:02:28AM +0200, Greg Kroah-Hartman wrote: > On Wed, Oct 26, 2022 at 12:07:01PM +0530, Vishal Chourasia wrote: > > On Tue, Oct 18, 2022 at 01:04:40PM +0200, Greg Kroah-Hartman wrote: > > > > > Why do you need to? What tools require these debugfs files to be > > > present?

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Wed, Oct 26, 2022 at 12:07:01PM +0530, Vishal Chourasia wrote: > On Tue, Oct 18, 2022 at 01:04:40PM +0200, Greg Kroah-Hartman wrote: > > > Why do you need to? What tools require these debugfs files to be > > present? > > We are not entirely sure what applications (if any) might be using this

Re: sched/debug: CPU hotplug operation suffers in a large cpu systems

On Tue, Oct 18, 2022 at 04:07:06PM +0530, Vishal Chourasia wrote: > On Mon, Oct 17, 2022 at 04:54:11PM +0200, Greg Kroah-Hartman wrote: > > On Mon, Oct 17, 2022 at 04:19:31PM +0200, Peter Zijlstra wrote: > > > > > > +GregKH who actually knows about debugfs. > > > > > > On Mon, Oct 17, 2022 at 06: