[PATCH v2 0/3] domstats:add haltpolling time statistic interface

This series add the ability to statistic the halt polling time when VM execute HLT(arm is WFI). v1: https://listman.redhat.com/archives/libvir-list/2021-July/msg00029.html changes from v1: - Move virGetCgroupValueRaw to utils.c and rename it virGetValueRaw. So that we can call it to obtain halt polling time. - Helper function virGetCpuHaltPollTime and virGetDebugFsKvmValue are added in a separate patch - Use STRPREFIX to match the path prefix. - Fix the logic that domstats will break when platform is non-linux, debugfs isn't mounted and so on. Yang Fei (3): util: Move virGetCgroupValueRaw to vircgroup.c and rename it virGetValueRaw util: Add virGetCpuHaltPollTime and virGetDebugFsKvmValue qemu: Introduce qemuDomainGetStatsCpuHaltPollTime src/libvirt_private.syms | 2 + src/qemu/qemu_driver.c | 28 +++++++++++ src/util/vircgroup.c | 29 +---------- src/util/vircgrouppriv.h | 3 -- src/util/vircgroupv1.c | 5 +- src/util/vircgroupv2.c | 5 +- src/util/virutil.c | 101 +++++++++++++++++++++++++++++++++++++++ src/util/virutil.h | 12 +++++ 8 files changed, 151 insertions(+), 34 deletions(-) -- 2.23.0