Re: [PATCH v2] nohz: prevent tilegx network driver interrupts

On Fri, Jul 10, 2015 at 03:37:25PM -0400, Chris Metcalf wrote:

Normally the tilegx networking shim sends irqs to all the cores
to distribute the load of processing incoming-packet interrupts,
so that you can get to multiple Gb's of traffic inbound.

However, in nohz_full mode we don't want to interrupt the
nohz_full cores by default, so we limit the set of cores we use
to only the online housekeeping cores.

To make client code easier to read, we introduce a new nohz_full
accessor, housekeeping_cpumask(), which returns a pointer to the
housekeeping_mask if nohz_full is enabled, and otherwise returns
the cpu_possible_mask.

Signed-off-by: Chris Metcalf <redacted>
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[..]

Just a small comment:

We can take these checks out from under a #ifdef CONFIG_NO_HZ_FULL
check, given that are stubbed tick_nohz_full_enabled() defined above.

  Josh