Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ab55028886dd1dd54585f22bf19a00eb23869340
Commit: ab55028886dd1dd54585f22bf19a00eb23869340
Parent: f91a8b447b9af64f589f6e13fec7f09b5927563d
Author: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 17 18:37:05 2007 -0700
Committer: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
CommitDate: Wed Jul 18 08:47:43 2007 -0700
xen: Implement sched_clock
Implement xen_sched_clock, which returns the number of ns the current
vcpu has been actually in an unstolen state (ie, running or blocked,
vs runnable-but-not-running, or offline) since boot.
Signed-off-by: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Acked-by: Chris Wright <[EMAIL PROTECTED]>
Cc: john stultz <[EMAIL PROTECTED]>
---
arch/i386/xen/enlighten.c | 2 +-
arch/i386/xen/time.c | 27 ++++++++++++++++++++++++++-
arch/i386/xen/xen-ops.h | 3 +--
3 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/arch/i386/xen/enlighten.c b/arch/i386/xen/enlighten.c
index 9550ae3..a9ba834 100644
--- a/arch/i386/xen/enlighten.c
+++ b/arch/i386/xen/enlighten.c
@@ -683,7 +683,7 @@ static const struct paravirt_ops xen_paravirt_ops
__initdata = {
.set_wallclock = xen_set_wallclock,
.get_wallclock = xen_get_wallclock,
.get_cpu_khz = xen_cpu_khz,
- .sched_clock = xen_clocksource_read,
+ .sched_clock = xen_sched_clock,
.cpuid = xen_cpuid,
diff --git a/arch/i386/xen/time.c b/arch/i386/xen/time.c
index acbfd99..2aab44b 100644
--- a/arch/i386/xen/time.c
+++ b/arch/i386/xen/time.c
@@ -28,6 +28,8 @@
#define TIMER_SLOP 100000
#define NS_PER_TICK (1000000000LL / HZ)
+static cycle_t xen_clocksource_read(void);
+
/* These are perodically updated in shared_info, and then copied here. */
struct shadow_time_info {
u64 tsc_timestamp; /* TSC at last update of time vals. */
@@ -169,6 +171,29 @@ static void do_stolen_accounting(void)
account_steal_time(idle_task(smp_processor_id()), ticks);
}
+/*
+ * Xen sched_clock implementation. Returns the number of unstolen
+ * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED
+ * states.
+ */
+unsigned long long xen_sched_clock(void)
+{
+ struct vcpu_runstate_info state;
+ cycle_t now = xen_clocksource_read();
+ s64 offset;
+
+ get_runstate_snapshot(&state);
+
+ WARN_ON(state.state != RUNSTATE_running);
+
+ offset = now - state.state_entry_time;
+ if (offset < 0)
+ offset = 0;
+
+ return state.time[RUNSTATE_blocked] +
+ state.time[RUNSTATE_running] +
+ offset;
+}
/* Get the CPU speed from Xen */
@@ -261,7 +286,7 @@ static u64 get_nsec_offset(struct shadow_time_info *shadow)
return scale_delta(delta, shadow->tsc_to_nsec_mul, shadow->tsc_shift);
}
-cycle_t xen_clocksource_read(void)
+static cycle_t xen_clocksource_read(void)
{
struct shadow_time_info *shadow = &get_cpu_var(shadow_time);
cycle_t ret;
diff --git a/arch/i386/xen/xen-ops.h b/arch/i386/xen/xen-ops.h
index 54d98b5..7667abd 100644
--- a/arch/i386/xen/xen-ops.h
+++ b/arch/i386/xen/xen-ops.h
@@ -2,7 +2,6 @@
#define XEN_OPS_H
#include <linux/init.h>
-#include <linux/clocksource.h>
DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
DECLARE_PER_CPU(unsigned long, xen_cr3);
@@ -18,7 +17,7 @@ unsigned long xen_cpu_khz(void);
void __init xen_time_init(void);
unsigned long xen_get_wallclock(void);
int xen_set_wallclock(unsigned long time);
-cycle_t xen_clocksource_read(void);
+unsigned long long xen_sched_clock(void);
void xen_mark_init_mm_pinned(void);
-
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