[irqchip:,irq/irqchip-next] irqchip/gic-v4.1: Reduce the delay when polling GICR_VPENDBASER.Dirty
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Message ID 160769872547.3364.17606433720729162482.tip-bot2@tip-bot2
State Accepted
Commit 0b39498230ae53e6af981141be99f4c7d5144de6
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  • [irqchip:,irq/irqchip-next] irqchip/gic-v4.1: Reduce the delay when polling GICR_VPENDBASER.Dirty
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tip-bot2 for Pawan Gupta Dec. 11, 2020, 2:58 p.m. UTC
The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     0b39498230ae53e6af981141be99f4c7d5144de6
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/0b39498230ae53e6af981141be99f4c7d5144de6
Author:        Shenming Lu <lushenming@huawei.com>
AuthorDate:    Sat, 28 Nov 2020 22:18:56 +08:00
Committer:     Marc Zyngier <maz@kernel.org>
CommitterDate: Fri, 11 Dec 2020 14:47:10 

irqchip/gic-v4.1: Reduce the delay when polling GICR_VPENDBASER.Dirty

The 10us delay of the poll on the GICR_VPENDBASER.Dirty bit is too
high, which might greatly affect the total scheduling latency of a
vCPU in our measurement. So we reduce it to 1 to lessen the impact.

Signed-off-by: Shenming Lu <lushenming@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201128141857.983-2-lushenming@huawei.com
 drivers/irqchip/irq-gic-v3-its.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox series

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 4069c21..d74ef41 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3808,7 +3808,7 @@  static void its_wait_vpt_parse_complete(void)
 	WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
 						       !(val & GICR_VPENDBASER_Dirty),
-						       10, 500));
+						       1, 500));
 static void its_vpe_schedule(struct its_vpe *vpe)