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Date: Wed, 14 Mar 2018 18:20:16 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Frederic Weisbecker <frederic@...nel.org> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>, Frederic Weisbecker <fweisbec@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Paul McKenney <paulmck@...ux.vnet.ibm.com>, Thomas Ilsche <thomas.ilsche@...dresden.de>, Doug Smythies <dsmythies@...us.net>, Rik van Riel <riel@...riel.com>, Aubrey Li <aubrey.li@...ux.intel.com>, Mike Galbraith <mgalbraith@...e.de>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [RFT][PATCH v4 1/7] time: tick-sched: Reorganize idle tick management code On Wed, Mar 14, 2018 at 04:49:39PM +0100, Frederic Weisbecker wrote: > On Mon, Mar 12, 2018 at 10:47:41AM +0100, Rafael J. Wysocki wrote: > > @@ -136,6 +138,13 @@ static inline u64 get_cpu_idle_time_us(i > > static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } > > #endif /* !CONFIG_NO_HZ_COMMON */ > > > > +static inline void tick_nohz_idle_stop_tick_protected(void) > > +{ > > + local_irq_disable(); > > + tick_nohz_idle_stop_tick(); > > + local_irq_enable(); > > +} > > It seems that even if we have CONFIG_NO_HZ_COMMON=n, > tick_nohz_idle_stop_tick_protected() will have overhead, right? IIRC the only callsite of the _protected thing that remains at the end is in the hotplug path. So who cares ;-)
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