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scsi: storvsc: Spread interrupts when picking a channel for I/O requests 

Update the algorithm in storvsc_do_io to look for a channel
starting with the current CPU + 1 and wrap around (within the
current NUMA node). This spreads VMbus interrupts more evenly
across CPUs. Previous code always started with first CPU in
the current NUMA node, skewing the interrupt load to that CPU.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Michael Kelley (EOSG) 2018-01-24 22:14:08 +00:00 committed by Martin K. Petersen
parent 9ff97fa8db
commit 9cfad4a5f4
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/storvsc_drv.c
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@ -1310,7 +1310,8 @@ static int storvsc_do_io(struct hv_device *device,
*/
cpumask_and(&alloced_mask, &stor_device->alloced_cpus,
cpumask_of_node(cpu_to_node(q_num)));
for_each_cpu(tgt_cpu, &alloced_mask) {
for_each_cpu_wrap(tgt_cpu, &alloced_mask,
outgoing_channel->target_cpu + 1) {
if (tgt_cpu != outgoing_channel->target_cpu) {
outgoing_channel =
stor_device->stor_chns[tgt_cpu];