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| author |   Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> | 2008-07-14 14:00:01 +0200 |
|---|---|---|
| committer |   Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:15 +0200 |
| commit | 3f7f95c65ef6a89472a28da1b9436eaeee288831 (patch) | |
| tree | d453af46dceb3fcce512a110573cd2e8e4341cfa /virt | |
| parent | KVM: kvmtrace: Remove use of bit fields in kvm trace structure (diff) | |
| download | linux-dev-3f7f95c65ef6a89472a28da1b9436eaeee288831.tar.xz linux-dev-3f7f95c65ef6a89472a28da1b9436eaeee288831.zip | |
KVM: kvmtrace: replace get_cycles with ktime_get v3
The current kvmtrace code uses get_cycles() while the interpretation would be
easier using using nanoseconds. ktime_get() should give at least the same
accuracy as get_cycles on all architectures (even better on 32bit archs) but
at a better unit (e.g. comparable between hosts with different frequencies.
[avi: avoid ktime_t in public header]
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_trace.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/virt/kvm/kvm_trace.c b/virt/kvm/kvm_trace.c index 9acb78b3cc9f..41dcc845f78c 100644 --- a/virt/kvm/kvm_trace.c +++ b/virt/kvm/kvm_trace.c @@ -17,6 +17,7 @@ #include <linux/module.h> #include <linux/relay.h> #include <linux/debugfs.h> +#include <linux/ktime.h> #include <linux/kvm_host.h> @@ -35,16 +36,16 @@ static struct kvm_trace *kvm_trace; struct kvm_trace_probe { const char *name; const char *format; - u32 cycle_in; + u32 timestamp_in; marker_probe_func *probe_func; }; -static inline int calc_rec_size(int cycle, int extra) +static inline int calc_rec_size(int timestamp, int extra) { int rec_size = KVM_TRC_HEAD_SIZE; rec_size += extra; - return cycle ? rec_size += KVM_TRC_CYCLE_SIZE : rec_size; + return timestamp ? rec_size += KVM_TRC_CYCLE_SIZE : rec_size; } static void kvm_add_trace(void *probe_private, void *call_data, @@ -69,20 +70,20 @@ static void kvm_add_trace(void *probe_private, void *call_data, WARN_ON(!(extra <= KVM_TRC_EXTRA_MAX)); extra = min_t(u32, extra, KVM_TRC_EXTRA_MAX); - rec.rec_val |= TRACE_REC_TCS(p->cycle_in) + rec.rec_val |= TRACE_REC_TCS(p->timestamp_in) | TRACE_REC_NUM_DATA_ARGS(extra); - if (p->cycle_in) { - rec.u.cycle.cycle_u64 = get_cycles(); + if (p->timestamp_in) { + rec.u.timestamp.timestamp = ktime_to_ns(ktime_get()); for (i = 0; i < extra; i++) - rec.u.cycle.extra_u32[i] = va_arg(*args, u32); + rec.u.timestamp.extra_u32[i] = va_arg(*args, u32); } else { for (i = 0; i < extra; i++) - rec.u.nocycle.extra_u32[i] = va_arg(*args, u32); + rec.u.notimestamp.extra_u32[i] = va_arg(*args, u32); } - size = calc_rec_size(p->cycle_in, extra * sizeof(u32)); + size = calc_rec_size(p->timestamp_in, extra * sizeof(u32)); relay_write(kt->rchan, &rec, size); } |