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Date: Sat, 3 Oct 2015 14:31:17 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: Mike Galbraith <umgwanakikbuti@...il.com> Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, Alexey Dobriyan <adobriyan@...il.com>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Christoph Lameter <cl@...ux.com> Subject: Re: 4.2.2: NR_CPUS effectively being 1 bug On Sat, Oct 03, 2015 at 02:04:44PM +0200, Mike Galbraith wrote: > On Sat, 2015-10-03 at 10:52 +0200, Ingo Molnar wrote: > > Ok, looks like a patch with good intentions but bad effects. Mind sending a revert > > patch, changelogged, signed off? > > No. They know. The reason for this patch is that NO_HZ_FULL is only useful on a CPU if no task other than the desired one can be scheduled on it. Hence the cpu_isolated_map. Only those who enable NO_HZ_FULL_ALL by accident do complain, not those who really use it so far. At least it makes people realize their mistake. That said I never liked that cpu_isolated_map. And some regular non-isolation work may be needed to be done even on NO_HZ_FULL_ALL machines and it that case we get screwed. So I should revert that and defer that isolation work to explicit affinity setting or cpusets. -- 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/
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