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| author | Alexey Makhalov <amakhalov@vmware.com> | 2020-03-23 19:57:06 +0000 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-03-24 10:06:27 +0100 |
| commit | e73a8f38f82dd1c41b70a06556bea7dc250cc384 (patch) | |
| tree | 68b53dcbde74788f222451c5dc27ca96b9209c4b /arch | |
| parent | ab02bb3f55f58e7608a88188000c3353398ebe3b (diff) | |
| download | linux-e73a8f38f82dd1c41b70a06556bea7dc250cc384.tar.gz linux-e73a8f38f82dd1c41b70a06556bea7dc250cc384.tar.bz2 linux-e73a8f38f82dd1c41b70a06556bea7dc250cc384.zip | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/vmware.c | 13 |
1 files changed, 12 insertions, 1 deletions
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; } |