From 6c93c6f3bad468ce4b8c843227d60fbeb02fd741 Mon Sep 17 00:00:00 2001 From: Sebastian Ene Date: Mon, 11 Jul 2022 08:17:20 +0000 Subject: misc: Add a mechanism to detect stalls on guest vCPUs This driver creates per-cpu hrtimers which are required to do the periodic 'pet' operation. On a conventional watchdog-core driver, the userspace is responsible for delivering the 'pet' events by writing to the particular /dev/watchdogN node. In this case we require a strong thread affinity to be able to account for lost time on a per vCPU. This part of the driver is the 'frontend' which is reponsible for delivering the periodic 'pet' events, configuring the virtual peripheral and listening for cpu hotplug events. The other part of the driver is an emulated MMIO device which is part of the KVM virtual machine monitor and this part accounts for lost time by looking at the /proc/{}/task/{}/stat entries. Reviewed-by: Guenter Roeck Reviewed-by: Will Deacon Signed-off-by: Sebastian Ene Link: https://lore.kernel.org/r/20220711081720.2870509-3-sebastianene@google.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/misc/Makefile') diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 70e800e9127f..2be8542616dd 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -60,3 +60,4 @@ obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o obj-$(CONFIG_OPEN_DICE) += open-dice.o +obj-$(CONFIG_VCPU_STALL_DETECTOR) += vcpu_stall_detector.o \ No newline at end of file -- cgit v1.2.3