Add the boot option that will allow us to offload the 1Hz scheduler tick to the housekeeping CPU.
Signed-off-by: Frederic Weisbecker <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Luiz Capitulino <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Wanpeng Li <[email protected]> Cc: Ingo Molnar <[email protected]> --- include/linux/sched/isolation.h | 3 ++- kernel/sched/isolation.c | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index d849431..c831855 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -11,7 +11,8 @@ enum hk_flags { HK_FLAG_MISC = (1 << 2), HK_FLAG_SCHED = (1 << 3), HK_FLAG_TICK = (1 << 4), - HK_FLAG_DOMAIN = (1 << 5), + HK_FLAG_TICK_SCHED = (1 << 5), + HK_FLAG_DOMAIN = (1 << 6), }; #ifdef CONFIG_CPU_ISOLATION diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index b71b436..264ddcd 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -136,6 +136,12 @@ static int __init housekeeping_isolcpus_setup(char *str) continue; } + if (!strncmp(str, "nohz_offload,", 13)) { + str += 13; + flags |= HK_FLAG_TICK | HK_FLAG_TICK_SCHED; + continue; + } + if (!strncmp(str, "domain,", 7)) { str += 7; flags |= HK_FLAG_DOMAIN; -- 2.7.4
