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authorShenming Lu <lushenming@huawei.com>2020-11-28 15:18:56 +0100
committerMarc Zyngier <maz@kernel.org>2020-12-11 15:47:10 +0100
commit0b39498230ae53e6af981141be99f4c7d5144de6 (patch)
tree3f0629ad35d303ffedf4b195ececfac9b230cff6 /drivers/irqchip/irq-gic-v3-its.c
parentirqchip/alpine-msi: Fix freeing of interrupts on allocation error path (diff)
downloadlinux-0b39498230ae53e6af981141be99f4c7d5144de6.tar.xz
linux-0b39498230ae53e6af981141be99f4c7d5144de6.zip
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
Diffstat (limited to '')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 4069c215328b..d74ef418e386 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,
!(val & GICR_VPENDBASER_Dirty),
- 10, 500));
+ 1, 500));
}
static void its_vpe_schedule(struct its_vpe *vpe)