Re: [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data forscalable detection of all-idle state

[Josh Triplett]

On Fri, Jun 28, 2013 at 01:10:17PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
> 
> This commit adds fields to the rcu_dyntick structure that are used to
> detect idle CPUs.  These new fields differ from the existing ones in
> that the existing ones consider a CPU executing in user mode to be idle,
> where the new ones consider CPUs executing in user mode to be busy.

Can you explain, both in the commit messages and in the comments added
by the next commit, *why* this code doesn't consider userspace a
quiescent state?

- Josh Triplett
--
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/