diff options
| author | Alexey Makhalov | 2020-03-23 19:57:06 +0000 |
|---|---|---|
| committer | Borislav Petkov | 2020-03-24 10:06:27 +0100 |
| commit | e73a8f38f82dd1c41b70a06556bea7dc250cc384 (patch) | |
| tree | 68b53dcbde74788f222451c5dc27ca96b9209c4b | |
| parent | ab02bb3f55f58e7608a88188000c3353398ebe3b (diff) | |
x86/vmware: Enable steal time accounting
Set paravirt_steal_rq_enabled if steal clock present.
paravirt_steal_rq_enabled is used in sched/core.c to adjust task
progress by offsetting stolen time. Use 'no-steal-acc' off switch (share
same name with KVM) to disable steal time accounting.
Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200323195707.31242-5-amakhalov@vmware.com
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/vmware.c | 13 |
2 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index c07815d230bc..863b37d6bd2e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3174,7 +3174,7 @@ [X86,PV_OPS] Disable paravirtualized VMware scheduler clock and use the default one. - no-steal-acc [X86,KVM,ARM64] Disable paravirtualized steal time + no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time accounting. steal time is computed, but won't influence scheduler behaviour diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index cc604614f0ae..e885f73bebd4 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -125,6 +125,7 @@ static struct cyc2ns_data vmware_cyc2ns __ro_after_init; static int vmw_sched_clock __initdata = 1; static DEFINE_PER_CPU_DECRYPTED(struct vmware_steal_time, vmw_steal_time) __aligned(64); static bool has_steal_clock; +static bool steal_acc __initdata = true; /* steal time accounting */ static __init int setup_vmw_sched_clock(char *s) { @@ -133,6 +134,13 @@ static __init int setup_vmw_sched_clock(char *s) } early_param("no-vmw-sched-clock", setup_vmw_sched_clock); +static __init int parse_no_stealacc(char *arg) +{ + steal_acc = false; + return 0; +} +early_param("no-steal-acc", parse_no_stealacc); + static unsigned long long notrace vmware_sched_clock(void) { unsigned long long ns; @@ -306,8 +314,11 @@ static int vmware_cpu_down_prepare(unsigned int cpu) static __init int activate_jump_labels(void) { - if (has_steal_clock) + if (has_steal_clock) { static_key_slow_inc(¶virt_steal_enabled); + if (steal_acc) + static_key_slow_inc(¶virt_steal_rq_enabled); + } return 0; } |