There are 3 packing levels: - the default one only packs the small tasks when the system is not busy - the none level doesn't pack anything - the full level uses as few as possible number of CPUs based on the current activity of the system
Signed-off-by: Vincent Guittot <[email protected]> --- include/linux/sched/sysctl.h | 8 ++++++++ kernel/sched/fair.c | 12 ++++++++++++ kernel/sysctl.c | 13 +++++++++++++ 3 files changed, 33 insertions(+) diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index bf8086b..b72a8b8 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -44,6 +44,14 @@ enum sched_tunable_scaling { }; extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; +enum sched_tunable_packing { + SCHED_PACKING_NONE, + SCHED_PACKING_DEFAULT, + SCHED_PACKING_FULL, +}; + +extern enum sched_tunable_packing __read_mostly sysctl_sched_packing_mode; + extern unsigned int sysctl_numa_balancing_scan_delay; extern unsigned int sysctl_numa_balancing_scan_period_min; extern unsigned int sysctl_numa_balancing_scan_period_max; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index a985c98..98166aa 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -113,6 +113,18 @@ unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL; unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL; #endif +#ifdef CONFIG_SMP +/* + * The packing policy of the scheduler + * + * Options are: + * SCHED_PACKING_NONE - No buddy is used for packing some tasks + * SCHED_PACKING_DEFAULT - The small tasks are packed on a not busy CPUs + * SCHED_PACKING_FULL - All Tasks are packed in a minimum number of CPUs + */ +enum sched_tunable_packing sysctl_sched_packing_mode = SCHED_PACKING_DEFAULT; + +#endif /* * Increase the granularity value when there are more CPUs, * because with more CPUs the 'effective latency' as visible diff --git a/kernel/sysctl.c b/kernel/sysctl.c index afc1dc6..ca22f59 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -265,6 +265,8 @@ static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ #ifdef CONFIG_SMP static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; +static int min_sched_packing_mode = SCHED_PACKING_NONE; +static int max_sched_packing_mode = SCHED_PACKING_FULL-1; #endif /* CONFIG_SMP */ #endif /* CONFIG_SCHED_DEBUG */ @@ -281,6 +283,17 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, +#ifdef CONFIG_SMP + { + .procname = "sched_packing_mode", + .data = &sysctl_sched_packing_mode, + .maxlen = sizeof(enum sched_tunable_packing), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = &min_sched_packing_mode, + .extra2 = &max_sched_packing_mode, + }, +#endif #ifdef CONFIG_SCHED_DEBUG { .procname = "sched_min_granularity_ns", -- 1.7.9.5 -- 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/
