From 432ac5e04b931df8376e0858d4bf0fd41436a271 Mon Sep 17 00:00:00 2001 From: Jan Glauber Date: Fri, 26 Feb 2010 22:37:37 +0100 Subject: [S390] qdio: optimize cache line usage of struct qdio_irq Remove a memset hack that relied on the internal layout of the qdio_irq struct and move the per device statistics data into an own cache line to avoid cache line bashing between the inbound and the outbound queue tasklets. Also reduce the number of allocated queues from 32 to 4 which is the current maximum. That saves a cache line in struct qdio_irq. Signed-off-by: Jan Glauber Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/qdio_setup.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/s390/cio/qdio_setup.c') diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c index 4464907715a4..7f4a75465140 100644 --- a/drivers/s390/cio/qdio_setup.c +++ b/drivers/s390/cio/qdio_setup.c @@ -382,7 +382,15 @@ int qdio_setup_irq(struct qdio_initialize *init_data) struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data; int rc; - memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr)); + memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib)); + memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag)); + memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw)); + memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc)); + memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat)); + + irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL; + irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0; + /* wipes qib.ac, required by ar7063 */ memset(irq_ptr->qdr, 0, sizeof(struct qdr)); -- cgit v1.2.3