[PATCH v4 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 v2: https://listman.redhat.com/archives/libvir-list/2021-July/msg00339.html v3: https://listman.redhat.com/archives/libvir-list/2021-July/msg00445.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. change from v2: - Drop patch 1, use virFileReadValueUllong() to get halt polling data. - Delete unnecessary error report in logs. - Remove the qemuDomainGetStatsCpuHaltPollTime function conditionally compiled on linux. - Document the new parameters in src/libvirt-domain.c. change from v3: - Add function virFileReadValueUllongQuiet without error report. - Move virGetCpuHaltPollTime to src/util/virhostcpu.c and change the name to virHostCPUGetHaltPollTime. - Replace the function which will report errors: virDirOpenIfExists -> virDirOpenQuiet virFileReadValueUllong -> virFileReadValueUllongQuiet Yang Fei (3): util: Add virFileReadValueUllongQuiet util: Add virHostCPUGetHaltPollTime qemu: Introduce qemuDomainGetStatsCpuHaltPollTime docs/manpages/virsh.rst | 4 ++++ src/libvirt-domain.c | 7 +++++++ src/libvirt_private.syms | 2 ++ src/qemu/qemu_driver.c | 20 ++++++++++++++++++++ src/util/virfile.c | 24 ++++++++++++++++++++++++ src/util/virfile.h | 2 ++ src/util/virhostcpu.c | 39 +++++++++++++++++++++++++++++++++++++++ src/util/virhostcpu.h | 4 ++++ 8 files changed, 102 insertions(+) -- 2.23.0