Re: [PATCH RFC tip/core/rcu] accelerate grace period if last non-dynticked CPU

[Andi Kleen]

"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> writes:

Kind of offtopic to the original patch, but I couldn't 
resist...

> +config RCU_FAST_NO_HZ
> +	bool "Accelerate last non-dyntick-idle CPU's grace periods"
> +	depends on TREE_RCU && NO_HZ && SMP

Having such a thing as a config option doesn't really make 
any sense to me. Who would want to recompile their kernel
to enable/disable this? If anything it should be runtime, or better
just unconditionally on.

In general RCU could probably reduce its number of "weird"
Kconfig options.

While I think I have a better understanding of RCU than a lot
of normal users I often have no clue what to set there when
building a kernel.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/