sched: use existing helper function for accessing avg_rt, avg_dl and avg_irq

[PATCH v2 1/2] sched: use existing helper functions to access ->avg_rt and ->avg_dl

Posted by Shrikanth Hegde 1 year, 12 months ago

There are helper functions called cpu_util_dl and cpu_util_rt which gives
the average utilization of DL and RT respectively. But there are few
places in code where these variables are used directly.

Instead use the helper function so that code becomes simpler and easy to
maintain later on. This patch doesn't intend any functional changes.

Signed-off-by: Shrikanth Hegde <sshegde@linux.vnet.ibm.com>
---
 kernel/sched/fair.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bcea3d55d95d..1aeca3f943a8 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9212,10 +9212,10 @@ static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)

 static inline bool others_have_blocked(struct rq *rq)
 {
-	if (READ_ONCE(rq->avg_rt.util_avg))
+	if (cpu_util_rt(rq))
 		return true;

-	if (READ_ONCE(rq->avg_dl.util_avg))
+	if (cpu_util_dl(rq))
 		return true;

 	if (thermal_load_avg(rq))
@@ -9481,8 +9481,8 @@ static unsigned long scale_rt_capacity(int cpu)
 	 * avg_thermal.load_avg tracks thermal pressure and the weighted
 	 * average uses the actual delta max capacity(load).
 	 */
-	used = READ_ONCE(rq->avg_rt.util_avg);
-	used += READ_ONCE(rq->avg_dl.util_avg);
+	used = cpu_util_rt(rq);
+	used += cpu_util_dl(rq);
 	used += thermal_load_avg(rq);

 	if (unlikely(used >= max))
--
2.39.3

Re: [PATCH v2 1/2] sched: use existing helper functions to access ->avg_rt and ->avg_dl

Posted by Vincent Guittot 1 year, 11 months ago

On Mon, 1 Jan 2024 at 16:49, Shrikanth Hegde <sshegde@linux.vnet.ibm.com> wrote:
>
> There are helper functions called cpu_util_dl and cpu_util_rt which gives
> the average utilization of DL and RT respectively. But there are few
> places in code where these variables are used directly.
>
> Instead use the helper function so that code becomes simpler and easy to
> maintain later on. This patch doesn't intend any functional changes.
>
> Signed-off-by: Shrikanth Hegde <sshegde@linux.vnet.ibm.com>

Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>

> ---
>  kernel/sched/fair.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index bcea3d55d95d..1aeca3f943a8 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9212,10 +9212,10 @@ static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)
>
>  static inline bool others_have_blocked(struct rq *rq)
>  {
> -       if (READ_ONCE(rq->avg_rt.util_avg))
> +       if (cpu_util_rt(rq))
>                 return true;
>
> -       if (READ_ONCE(rq->avg_dl.util_avg))
> +       if (cpu_util_dl(rq))
>                 return true;
>
>         if (thermal_load_avg(rq))
> @@ -9481,8 +9481,8 @@ static unsigned long scale_rt_capacity(int cpu)
>          * avg_thermal.load_avg tracks thermal pressure and the weighted
>          * average uses the actual delta max capacity(load).
>          */
> -       used = READ_ONCE(rq->avg_rt.util_avg);
> -       used += READ_ONCE(rq->avg_dl.util_avg);
> +       used = cpu_util_rt(rq);
> +       used += cpu_util_dl(rq);
>         used += thermal_load_avg(rq);
>
>         if (unlikely(used >= max))
> --
> 2.39.3
>

[tip: sched/core] sched/fair: Use existing helper functions to access ->avg_rt and ->avg_dl

Posted by tip-bot2 for Shrikanth Hegde 1 year, 10 months ago

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     8b936fc1d84f7d70009ea34d66bbf6c54c09fae7
Gitweb:        https://git.kernel.org/tip/8b936fc1d84f7d70009ea34d66bbf6c54c09fae7
Author:        Shrikanth Hegde <sshegde@linux.vnet.ibm.com>
AuthorDate:    Mon, 01 Jan 2024 21:16:23 +05:30
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Wed, 28 Feb 2024 15:11:14 +01:00

sched/fair: Use existing helper functions to access ->avg_rt and ->avg_dl

There are helper functions called cpu_util_dl() and cpu_util_rt() which give
the average utilization of DL and RT respectively. But there are a few
places in code where access to these variables is open-coded.

Instead use the helper function so that code becomes simpler and easier to
maintain later on.

No functional changes intended.

Signed-off-by: Shrikanth Hegde <sshegde@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20240101154624.100981-2-sshegde@linux.vnet.ibm.com
---
 kernel/sched/fair.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8e30e2b..127e727 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9237,10 +9237,10 @@ static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)
 
 static inline bool others_have_blocked(struct rq *rq)
 {
-	if (READ_ONCE(rq->avg_rt.util_avg))
+	if (cpu_util_rt(rq))
 		return true;
 
-	if (READ_ONCE(rq->avg_dl.util_avg))
+	if (cpu_util_dl(rq))
 		return true;
 
 	if (thermal_load_avg(rq))
@@ -9506,8 +9506,8 @@ static unsigned long scale_rt_capacity(int cpu)
 	 * avg_thermal.load_avg tracks thermal pressure and the weighted
 	 * average uses the actual delta max capacity(load).
 	 */
-	used = READ_ONCE(rq->avg_rt.util_avg);
-	used += READ_ONCE(rq->avg_dl.util_avg);
+	used = cpu_util_rt(rq);
+	used += cpu_util_dl(rq);
 	used += thermal_load_avg(rq);
 
 	if (unlikely(used >= max))