On 9/24/20 8:09 AM, Frederic Weisbecker wrote: > On Thu, Sep 24, 2020 at 10:40:29AM +0200, peterz@xxxxxxxxxxxxx wrote: >> On Wed, Sep 23, 2020 at 02:11:23PM -0400, Nitesh Narayan Lal wrote: >>> Introduce a new API hk_num_online_cpus(), that can be used to >>> retrieve the number of online housekeeping CPUs that are meant to handle >>> managed IRQ jobs. >>> >>> This API is introduced for the drivers that were previously relying only >>> on num_online_cpus() to determine the number of MSIX vectors to create. >>> In an RT environment with large isolated but fewer housekeeping CPUs this >>> was leading to a situation where an attempt to move all of the vectors >>> corresponding to isolated CPUs to housekeeping CPUs were failing due to >>> per CPU vector limit. >>> >>> Signed-off-by: Nitesh Narayan Lal <nitesh@xxxxxxxxxx> >>> --- >>> include/linux/sched/isolation.h | 13 +++++++++++++ >>> 1 file changed, 13 insertions(+) >>> >>> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h >>> index cc9f393e2a70..2e96b626e02e 100644 >>> --- a/include/linux/sched/isolation.h >>> +++ b/include/linux/sched/isolation.h >>> @@ -57,4 +57,17 @@ static inline bool housekeeping_cpu(int cpu, enum hk_flags flags) >>> return true; >>> } >>> >>> +static inline unsigned int hk_num_online_cpus(void) >> This breaks with the established naming of that header. > I guess we can make it housekeeping_num_online_cpus() ? Right, I can do that. Thanks > -- Nitesh
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