+David W for his input. On Tue, Aug 20, 2024, Suleiman Souhlal wrote: > This series makes it so that the time that the host is suspended is > included in guests' steal time. > > When the host resumes from a suspend, the guest thinks any task > that was running during the suspend ran for a long time, even though > the effective run time was much shorter, which can end up having > negative effects with scheduling. This can be particularly noticeable > if the guest task was RT, as it can end up getting throttled for a > long time. > > To mitigate this issue, we include the time that the host was > suspended in steal time, which lets the guest can subtract the > duration from the tasks' runtime. > > (v1 was at https://lore.kernel.org/kvm/20240710074410.770409-1-suleiman@xxxxxxxxxx/) > > v1 -> v2: > - Accumulate suspend time at machine-independent kvm layer and track per-VCPU > instead of per-VM. > - Document changes. > > Suleiman Souhlal (3): > KVM: Introduce kvm_total_suspend_ns(). > KVM: x86: Include host suspended time in steal time. > KVM: x86: Document host suspend being included in steal time. > > Documentation/virt/kvm/x86/msr.rst | 6 ++++-- > arch/x86/include/asm/kvm_host.h | 1 + > arch/x86/kvm/x86.c | 11 ++++++++++- > include/linux/kvm_host.h | 2 ++ > virt/kvm/kvm_main.c | 13 +++++++++++++ > 5 files changed, 30 insertions(+), 3 deletions(-) > > -- > 2.46.0.184.g6999bdac58-goog >
