* [PATCH] schedule: move last_run_time to the credit scheduler privates
@ 2018-09-11 8:10 Andrii Anisov
2018-09-11 8:29 ` Jan Beulich
2018-09-12 8:14 ` Dario Faggioli
0 siblings, 2 replies; 5+ messages in thread
From: Andrii Anisov @ 2018-09-11 8:10 UTC (permalink / raw)
To: xen-devel
Cc: Tim Deegan, Stefano Stabellini, Andrii Anisov,
Konrad Rzeszutek Wilk, George Dunlap, Andrew Cooper, Ian Jackson,
Dario Faggioli, Julien Grall, Jan Beulich, xen-devel, Wei Liu
From: Andrii Anisov <andrii_anisov@epam.com>
The structure member last_run_time is used by a credit scheduler only.
So move it from a generic vcpu sctructure to the credit scheduler private
vcpu definition.
Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
---
xen/common/sched_credit.c | 12 +++++++++---
xen/common/schedule.c | 1 -
xen/include/xen/sched.h | 3 ---
3 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index 84e744b..7170172 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -175,6 +175,9 @@ struct csched_vcpu {
atomic_t credit;
unsigned int residual;
+ /* last time when vCPU is scheduled out */
+ uint64_t last_run_time;
+
#ifdef CSCHED_STATS
struct {
int credit_last;
@@ -701,10 +704,11 @@ static unsigned int vcpu_migration_delay_us;
integer_param("vcpu_migration_delay", vcpu_migration_delay_us);
static inline bool
-__csched_vcpu_is_cache_hot(const struct csched_private *prv, struct vcpu *v)
+__csched_vcpu_is_cache_hot(const struct csched_private *prv,
+ struct csched_vcpu * scurr)
{
bool hot = prv->vcpu_migr_delay &&
- (NOW() - v->last_run_time) < prv->vcpu_migr_delay;
+ (NOW() - scurr->last_run_time) < prv->vcpu_migr_delay;
if ( hot )
SCHED_STAT_CRANK(vcpu_hot);
@@ -716,6 +720,7 @@ static inline int
__csched_vcpu_is_migrateable(const struct csched_private *prv, struct vcpu *vc,
int dest_cpu, cpumask_t *mask)
{
+ struct csched_vcpu * scurr = CSCHED_VCPU(vc);
/*
* Don't pick up work that's hot on peer PCPU, or that can't (or
* would prefer not to) run on cpu.
@@ -725,7 +730,7 @@ __csched_vcpu_is_migrateable(const struct csched_private *prv, struct vcpu *vc,
*/
ASSERT(!vc->is_running);
- return !__csched_vcpu_is_cache_hot(prv, vc) &&
+ return !__csched_vcpu_is_cache_hot(prv, scurr) &&
cpumask_test_cpu(dest_cpu, mask);
}
@@ -1869,6 +1874,7 @@ csched_schedule(
/* Update credits of a non-idle VCPU. */
burn_credits(scurr, now);
scurr->start_time -= now;
+ scurr->last_run_time = now;
}
else
{
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 05281d6..3c299ca 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -1556,7 +1556,6 @@ static void schedule(void)
((prev->pause_flags & VPF_blocked) ? RUNSTATE_blocked :
(vcpu_runnable(prev) ? RUNSTATE_runnable : RUNSTATE_offline)),
now);
- prev->last_run_time = now;
ASSERT(next->runstate.state != RUNSTATE_running);
vcpu_runstate_change(next, RUNSTATE_running, now);
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 0ba80cb..b6b2c43 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -173,9 +173,6 @@ struct vcpu
} runstate_guest; /* guest address */
#endif
- /* last time when vCPU is scheduled out */
- uint64_t last_run_time;
-
/* Has the FPU been initialised? */
bool fpu_initialised;
/* Has the FPU been used since it was last saved? */
--
2.7.4
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] schedule: move last_run_time to the credit scheduler privates
2018-09-11 8:10 [PATCH] schedule: move last_run_time to the credit scheduler privates Andrii Anisov
@ 2018-09-11 8:29 ` Jan Beulich
2018-09-11 16:08 ` Dario Faggioli
2018-09-12 8:14 ` Dario Faggioli
1 sibling, 1 reply; 5+ messages in thread
From: Jan Beulich @ 2018-09-11 8:29 UTC (permalink / raw)
To: andrii.anisov
Cc: Tim Deegan, Stefano Stabellini, Wei Liu, Konrad Rzeszutek Wilk,
George Dunlap, Andrew Cooper, Ian Jackson, Dario Faggioli,
Julien Grall, xen-devel, andrii_anisov
>>> On 11.09.18 at 10:10, <andrii.anisov@gmail.com> wrote:
> From: Andrii Anisov <andrii_anisov@epam.com>
>
> The structure member last_run_time is used by a credit scheduler only.
> So move it from a generic vcpu sctructure to the credit scheduler private
> vcpu definition.
>
> Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
> ---
> xen/common/sched_credit.c | 12 +++++++++---
> xen/common/schedule.c | 1 -
> xen/include/xen/sched.h | 3 ---
> 3 files changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
> index 84e744b..7170172 100644
> --- a/xen/common/sched_credit.c
> +++ b/xen/common/sched_credit.c
> @@ -175,6 +175,9 @@ struct csched_vcpu {
> atomic_t credit;
> unsigned int residual;
>
> + /* last time when vCPU is scheduled out */
> + uint64_t last_run_time;
> +
> #ifdef CSCHED_STATS
> struct {
> int credit_last;
> @@ -701,10 +704,11 @@ static unsigned int vcpu_migration_delay_us;
> integer_param("vcpu_migration_delay", vcpu_migration_delay_us);
>
> static inline bool
> -__csched_vcpu_is_cache_hot(const struct csched_private *prv, struct vcpu *v)
> +__csched_vcpu_is_cache_hot(const struct csched_private *prv,
> + struct csched_vcpu * scurr)
Stray blank, and it looks like the parameter can be pointer to const.
Similar further down.
Jan
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] schedule: move last_run_time to the credit scheduler privates
2018-09-11 8:29 ` Jan Beulich
@ 2018-09-11 16:08 ` Dario Faggioli
0 siblings, 0 replies; 5+ messages in thread
From: Dario Faggioli @ 2018-09-11 16:08 UTC (permalink / raw)
To: andrii.anisov
Cc: Stefano Stabellini, Wei Liu, Konrad Rzeszutek Wilk,
George Dunlap, Andrew Cooper, Tim Deegan, Julien Grall,
andrii_anisov, Jan Beulich, xen-devel, Ian Jackson
[-- Attachment #1.1: Type: text/plain, Size: 1360 bytes --]
On Tue, 2018-09-11 at 02:29 -0600, Jan Beulich wrote:
> > > > On 11.09.18 at 10:10, <andrii.anisov@gmail.com> wrote:
> >
> > From: Andrii Anisov <andrii_anisov@epam.com>
> >
> > diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
> > index 84e744b..7170172 100644
> >
> > @@ -701,10 +704,11 @@ static unsigned int vcpu_migration_delay_us;
> > integer_param("vcpu_migration_delay", vcpu_migration_delay_us);
> >
> > static inline bool
> > -__csched_vcpu_is_cache_hot(const struct csched_private *prv,
> > struct vcpu *v)
> > +__csched_vcpu_is_cache_hot(const struct csched_private *prv,
> > + struct csched_vcpu * scurr)
>
> Stray blank, and it looks like the parameter can be pointer to const.
> Similar further down.
>
And besides this that Jan is saying, I'd name the parameter 'svc'
rather than 'scurr'.
Calling it scurr makes one think that it is always a vcpu that is
currently running on a pcpu which is being passed to the function. But
that, not only is not at all required, but it is not even the case
right now.
Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] schedule: move last_run_time to the credit scheduler privates
2018-09-11 8:10 [PATCH] schedule: move last_run_time to the credit scheduler privates Andrii Anisov
2018-09-11 8:29 ` Jan Beulich
@ 2018-09-12 8:14 ` Dario Faggioli
2018-09-12 9:26 ` Andrii Anisov
1 sibling, 1 reply; 5+ messages in thread
From: Dario Faggioli @ 2018-09-12 8:14 UTC (permalink / raw)
To: Andrii Anisov, xen-devel
Cc: Wei Liu, Stefano Stabellini, Andrii Anisov,
Konrad Rzeszutek Wilk, George Dunlap, Andrew Cooper, Tim Deegan,
Julien Grall, Jan Beulich, xen-devel, Ian Jackson
[-- Attachment #1.1: Type: text/plain, Size: 1020 bytes --]
On Tue, 2018-09-11 at 11:10 +0300, Andrii Anisov wrote:
> From: Andrii Anisov <andrii_anisov@epam.com>
>
> The structure member last_run_time is used by a credit scheduler
> only.
> So move it from a generic vcpu sctructure to the credit scheduler
> private
> vcpu definition.
>
> Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
> ---
>
> index 84e744b..7170172 100644
> --- a/xen/common/sched_credit.c
> +++ b/xen/common/sched_credit.c
> @@ -175,6 +175,9 @@ struct csched_vcpu {
> atomic_t credit;
> unsigned int residual;
>
> + /* last time when vCPU is scheduled out */
> + uint64_t last_run_time;
> +
>
I think that, while we're doing this, we should take the chance to
convert the type to s_time_t too.
Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] schedule: move last_run_time to the credit scheduler privates
2018-09-12 8:14 ` Dario Faggioli
@ 2018-09-12 9:26 ` Andrii Anisov
0 siblings, 0 replies; 5+ messages in thread
From: Andrii Anisov @ 2018-09-12 9:26 UTC (permalink / raw)
To: Dario Faggioli, Andrii Anisov, xen-devel
Cc: Stefano Stabellini, Wei Liu, Konrad Rzeszutek Wilk,
George Dunlap, Andrew Cooper, Tim Deegan, Julien Grall,
Jan Beulich, xen-devel, Ian Jackson
Hello Dario,
On 12.09.18 11:14, Dario Faggioli wrote:
> I think that, while we're doing this, we should take the chance to
> convert the type to s_time_t too.
Good point, as well as renaming scurr.
--
*Andrii Anisov*
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^ permalink raw reply [flat|nested] 5+ messages in thread
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2018-09-11 8:10 [PATCH] schedule: move last_run_time to the credit scheduler privates Andrii Anisov
2018-09-11 8:29 ` Jan Beulich
2018-09-11 16:08 ` Dario Faggioli
2018-09-12 8:14 ` Dario Faggioli
2018-09-12 9:26 ` Andrii Anisov
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