On Sat, Feb 23, 2013 at 10:21 AM, Frederic Weisbecker
<fweis...@gmail.com> wrote:
>
> But tick_nohz_irq_exit() may trigger the timer softirq itself.
Suggestion: merge it with the whole softirq handler.
The softirq code *already* knows about the whole "oops, one softirq
may trigger another" issue, and has a loop - with protection against
excess - for exactly this reason. See the whole "goto restart" thing.
And tick_nohz_irq_exit() really has very similar semantics to
softiq's, it's just "CPU is idle and no pending reschedule" instead of
a softirq. But the basic rules are the same ("only run this at the
top-level context when exiting the last irq").
So maybe the right thing to do is move the whole "goto restart" one
level up, and do softirq's and tick_nohz_irq_exit both inside that
loop.
Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
