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Date: Fri, 15 Jul 2022 16:14:01 +0200 From: Greg KH <greg@...ah.com> To: Mark-PK Tsai <mark-pk.tsai@...iatek.com> Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, Matthias Brugger <matthias.bgg@...il.com>, yj.chiang@...iatek.com, Daniel Bristot de Oliveira <bristot@...hat.com>, stable@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org Subject: Re: [PATCH 5.4] sched/rt: Disable RT_RUNTIME_SHARE by default On Thu, Jul 14, 2022 at 03:30:52PM +0800, Mark-PK Tsai wrote: > From: Daniel Bristot de Oliveira <bristot@...hat.com> > > commit 2586af1ac187f6b3a50930a4e33497074e81762d upstream. > > The RT_RUNTIME_SHARE sched feature enables the sharing of rt_runtime > between CPUs, allowing a CPU to run a real-time task up to 100% of the > time while leaving more space for non-real-time tasks to run on the CPU > that lend rt_runtime. > > The problem is that a CPU can easily borrow enough rt_runtime to allow > a spinning rt-task to run forever, starving per-cpu tasks like kworkers, > which are non-real-time by design. > > This patch disables RT_RUNTIME_SHARE by default, avoiding this problem. > The feature will still be present for users that want to enable it, > though. > > Signed-off-by: Daniel Bristot de Oliveira <bristot@...hat.com> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> > Tested-by: Wei Wang <wvw@...gle.com> > Link: https://lkml.kernel.org/r/b776ab46817e3db5d8ef79175fa0d71073c051c7.1600697903.git.bristot@redhat.com > Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com> > Cc: stable@...r.kernel.org > --- > kernel/sched/features.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Now queued up, thanks. greg k-h
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