> introduce the CONFIG_DEFAULT_MIGRATION_COST method for an architecture
> to set the scheduler migration costs. This turns off automatic detection
> of migration costs. Makes sense on virtual platforms, where migration
> costs are hard to measure accurately.
>
> Signed-off-by: Ingo Molnar <[email protected]>
>
> ----
>
> arch/s390/Kconfig | 4 ++++
> kernel/sched.c | 13 ++++++++++++-
> 2 files changed, 16 insertions(+), 1 deletion(-)
>
> Index: linux-robust-list.q/arch/s390/Kconfig
> ===================================================================
> --- linux-robust-list.q.orig/arch/s390/Kconfig
> +++ linux-robust-list.q/arch/s390/Kconfig
> @@ -80,6 +80,10 @@ config HOTPLUG_CPU
> can be controlled through /sys/devices/system/cpu/cpu#.
> Say N if you want to disable CPU hotplug.
>
> +config DEFAULT_MIGRATION_COST
> + int
> + default "1000000"
> +
> config MATHEMU
> bool "IEEE FPU emulation"
> depends on MARCH_G5
> Index: linux-robust-list.q/kernel/sched.c
> ===================================================================
> --- linux-robust-list.q.orig/kernel/sched.c
> +++ linux-robust-list.q/kernel/sched.c
> @@ -5159,7 +5159,18 @@ static void init_sched_build_groups(stru
> #define MAX_DOMAIN_DISTANCE 32
>
> static unsigned long long migration_cost[MAX_DOMAIN_DISTANCE] =
> - { [ 0 ... MAX_DOMAIN_DISTANCE-1 ] = -1LL };
> + { [ 0 ... MAX_DOMAIN_DISTANCE-1 ] =
> +/*
> + * Architectures may override the migration cost and thus avoid
> + * boot-time calibration. Unit is nanoseconds. Mostly useful for
> + * virtualized hardware:
> + */
> +#ifdef CONFIG_DEFAULT_MIGRATION_COST
> + CONFIG_DEFAULT_MIGRATION_COST
> +#else
> + -1LL
> +#endif
> +};
>
> /*
> * Allow override of migration cost - in units of microseconds.
> -
This one should be applied then.
Thanks,
Heiko
-
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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
