Messages in this thread | | | Date | Wed, 8 Jul 2015 14:52:10 +0200 | From | Frederic Weisbecker <> | Subject | Re: + kmod-remove-unecessary-explicit-wide-cpu-affinity-setting.patch added to -mm tree |
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On Wed, Jul 08, 2015 at 01:32:26AM +0200, Oleg Nesterov wrote: > Well, sorry for noise. > > Let me repeat that I agree with this change, but... > > On 07/07, Andrew Morton wrote: > > > > From: Frederic Weisbecker <fweisbec@gmail.com> > > Subject: kmod: remove unecessary explicit wide CPU affinity setting > > > > Not only useless it even breaks nohz full. The housekeeping work (general > > kernel internal code that user doesn't care much about) is handled by a > > reduced set of CPUs in nohz full, precisely those that are not included by > > nohz_full= kernel parameters. For example unbound workqueues are handled > > by housekeeping CPUs. > > I still think this part of the changelog looks confusing and just wrong.
I agree!
> > It is not that it breaks nohz full, unbound workqueues have nothing to > do with housekeeping_mask from the kernel pov. But yes, people can change > ->cpumask and this can connect to housekeeping_mask.
Right. In fact that's the motivation of the patch but the connection is much more indirect than what the changelog suggests. So I'll fix the changelog.
> > Frederic, may I ask you to update the changelog? Although perhaps it was > just me who was confused...
Sure! I think Andrew applied the patches to keep track of them and make sure they don't get lost. But I'm working on a new iteration to replace them.
Thanks!
> Oleg. >
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