Re: [PATCH 11/32] nohz/cpuset: Don't turn off the tick if rcu needs it

From: Gilad Ben-Yossef
Date: Wed Mar 28 2012 - 08:41:41 EST

On Wed, Mar 28, 2012 at 2:21 PM, Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:
> On Wed, Mar 28, 2012 at 09:55:37AM +0200, Gilad Ben-Yossef wrote:
>> At the risk of butting in on this little flame war, I think it is
>> worth mentioning
>> that this discussion arouse in the context of of a feature
>> (cpuset/nohz) that deals
>> with a single task running alone on a CPU and making zero use of
>> kernel services,
>> from scheduling, through interrupts, to system calls. It's just a pure
>> 100% cpu  bound task.
> Note that cpu isolation is a specific usecase of nohz cpusets. But it's
> intended to be more generally useful (probably for most workloads). That
> means we really want to support syscalls, interrupts and everything. That's
> why it is called adaptive tickless and not just userspace isolated tickless.

Point taken. I guess I suffer from myopic vision just like the next guy :-)


Gilad Ben-Yossef
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