xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

genirq/affinity: Provide smarter irq spreading infrastructure

Browse Source 
The current irq spreading infrastructure is just looking at a cpumask and
tries to spread the interrupts over the mask. Thats suboptimal as it does
not take numa nodes into account.

Change the logic so the interrupts are spread across numa nodes and inside
the nodes. If there are more cpus than vectors per node, then we set the
affinity to several cpus. If HT siblings are available we take that into
account and try to set all siblings to a single vector.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: axboe@fb.com
Cc: keith.busch@intel.com
Cc: agordeev@redhat.com
Cc: linux-block@vger.kernel.org
Link: http://lkml.kernel.org/r/1473862739-15032-3-git-send-email-hch@lst.de
This commit is contained in:
Thomas Gleixner
2016-09-14 16:18:48 +02:00
parent 28f4b04143
commit 34c3d9819f
2 changed files with 164 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/interrupt.h
View File

@@ -279,6 +279,8 @@ extern int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs);
struct cpumask *irq_create_affinity_masks(const struct cpumask *affinity, int nvec);
int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec);
#else /* CONFIG_SMP */
@@ -316,6 +318,19 @@ static inline struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
*nr_vecs = 1;
return NULL;
}
static inline struct cpumask *
irq_create_affinity_masks(const struct cpumask *affinity, int nvec)
{
return NULL;
}
static inline int
irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
{
return maxvec;
}
#endif /* CONFIG_SMP */
/*