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authorJing Zhang <jingzhangos@google.com>2021-10-08 19:12:08 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2021-12-08 04:24:52 -0500
commitc3858335c711569b82a234a560dc19247e8f3fcc (patch)
tree2c4e6688e22372a5da0e8209a7799c16bee890b0 /include/linux/kvm_host.h
parentfac4268894394213127e43856f41d10f29131e69 (diff)
KVM: stats: Add stat to detect if vcpu is currently blocking
Add a "blocking" stat that userspace can use to detect the case where a vCPU is not being run because of an vCPU/guest action, e.g. HLT or WFS on x86, WFI on arm64, etc... Current guest/host/halt stats don't show this well, e.g. if a guest halts for a long period of time then the vCPU could could appear pathologically blocked due to a host condition, when in reality the vCPU has been put into a not-runnable state by the guest. Originally-by: Cannon Matthews <cannonmatthews@google.com> Suggested-by: Sean Christopherson <seanjc@google.com> Reviewed-by: David Matlack <dmatlack@google.com> Signed-off-by: Jing Zhang <jingzhangos@google.com> [sean: renamed stat to "blocking", massaged changelog] Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211009021236.4122790-16-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
-rw-r--r--include/linux/kvm_host.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index bd13c5b5bd1d..dc7740cafea7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1587,7 +1587,8 @@ struct _kvm_stats_desc {
STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_hist, \
HALT_POLL_HIST_COUNT), \
STATS_DESC_LOGHIST_TIME_NSEC(VCPU_GENERIC, halt_wait_hist, \
- HALT_POLL_HIST_COUNT)
+ HALT_POLL_HIST_COUNT), \
+ STATS_DESC_ICOUNTER(VCPU_GENERIC, blocking)
extern struct dentry *kvm_debugfs_dir;