Commit-ID: 8cb9764fc88b41db11f251e8b2a0d006578b7eb4 Gitweb: http://git.kernel.org/tip/8cb9764fc88b41db11f251e8b2a0d006578b7eb4 Author: Chris Metcalf <[email protected]> AuthorDate: Wed, 6 May 2015 18:04:26 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 7 May 2015 12:02:51 +0200
nohz: Set isolcpus when nohz_full is set nohz_full is only useful with isolcpus are also set, since otherwise the scheduler has to run periodically to try to determine whether to steal work from other cores. Accordingly, when booting with nohz_full=xxx on the command line, we should act as if isolcpus=xxx was also set, and set (or extend) the isolcpus set to include the nohz_full cpus. Signed-off-by: Chris Metcalf <[email protected]> Signed-off-by: Frederic Weisbecker <[email protected]> Acked-by: Rik van Riel <[email protected]> Acked-by: Mike Galbraith <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Jones <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- kernel/sched/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 54f032c..b8f4876 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7036,6 +7036,9 @@ void __init sched_init_smp(void) alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL); alloc_cpumask_var(&fallback_doms, GFP_KERNEL); + /* nohz_full won't take effect without isolating the cpus. */ + tick_nohz_full_add_cpus_to(cpu_isolated_map); + sched_init_numa(); /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
