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| author | Wanpeng Li <wanpengli@tencent.com> | 2021-05-18 05:00:35 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-05-27 07:45:58 -0400 |
| commit | 9805cf03fdb6828091fe09e4ef0fb544fca3eaf6 (patch) | |
| tree | a51918d68d2f6c189ac24c3a1d6bf4787c5b5880 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | fb0f94794bb7558c078ce37b1a6e30d881fd7888 (diff) | |
KVM: LAPIC: Narrow the timer latency between wait_lapic_expire and world switch
Let's treat lapic_timer_advance_ns automatic tuning logic as hypervisor
overhead, move it before wait_lapic_expire instead of between wait_lapic_expire
and the world switch, the wait duration should be calculated by the
up-to-date guest_tsc after the overhead of automatic tuning logic. This
patch reduces ~30+ cycles for kvm-unit-tests/tscdeadline-latency when testing
busy waits.
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1621339235-11131-5-git-send-email-wanpengli@tencent.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions