* [PATCH v2 0/1] arm: remove cpu_efficiency
@ 2017-10-12 14:00 Dietmar Eggemann
2017-10-12 14:00 ` [PATCH v2 1/1] arm: topology: " Dietmar Eggemann
0 siblings, 1 reply; 5+ messages in thread
From: Dietmar Eggemann @ 2017-10-12 14:00 UTC (permalink / raw)
To: linux-arm-kernel
v1: review results [1]:
Vincent pointed out that there is a superfluous continue statement in
parse_dt_topology(). Got rid of it.
Krzysztof Kozlowski took the exynos and Simon Horman the renesas related
dt bits into their for-next (v4.15) branches.
***
For Cortex-A15/A7 arm big.LITTLE systems there are currently two ways to
set the cpu capacity.
The first one (commit 06073ee26775 "ARM: 8621/3: parse cpu
capacity-dmips-mhz from DT") is based on dt 'cpu capacity-dmips-mhz'
bindings and the appropriate dt parsing code in
drivers/base/arch_topology.c. It further takes differences in maximum
cpu frequency values into consideration, normalizes the maximum cpu
capacity to SCHED_CAPACITY_SCALE (1024) and scales all the cpus
accordingly.
cpu capacity = (capacity-dmips-mhz * max cpu frequency) /
(max capacity-dmips-mhz * max (max cpu frequency)
This solution is shared between arm and arm64 and works for other
combinations of big and little cpus (besides Cortex-A15/A7) as well.
The second one (commit 339ca09d7ada "ARM: 7463/1: topology: Update
cpu_power according to DT information" is based on the 'struct
cpu_efficiency table_efficiency[]' and the dt parsing code in
arch/arm/kernel/topology.c. It further requires a clock-frequency
property per cpu node, calculates a so called middle frequency for an
average cpu in the system which is as close as possible to
SCHED_CAPACITY_SCALE (1024) and uses this to compute the cpu capacity
values.
cpu capacity = (cpu efficiency * clock frequency) / middle capacity
This solution only works for Cortex-A15/A7 arm big.LITTLE systems.
The aim of this patch is to have only one solution for all arm and arm64
big.LITTLE platforms.
(1) Therefore, it removes the code for the 'cpu_efficiency/
clock-frequency dt property' (second) solution.
(2) Moreover, it will also assure that the highest original cpu capacity
(rq->cpu_capacity_orig) in a non-smt system is SCHED_CAPACITY_SCALE
(1024).
(3) And finally, another advantage is the dynamic detection of the max
cpu frequency which comes with the first solution instead of the
static clock-frequency dt property value.
Currently, the arm dt parsing code in parse_dt_topology() checks if the
dt uses the capacity-dmips-mhz property. If this is the case it uses
the first, otherwise the second solution. This patch removes the code
for the second solution from arch/arm/kernel/topology.c.
With the dt related patches for exynos and renesas now in the
appropriated for-next branches for v4.15 there are no Cortex-A15/A7 arm
big.LITTLE systems left relying on the 'cpu_efficiency/clock-frequency
dt property' based solution anymore.
This patch has been tested on TC2 and Samsung Chromebook 2 13"
(peach-pi, Exynos 5800).
[1] https://marc.info/?l=linux-kernel&m=150410411807050&w=2
Changes v1->v2:
- Rebase on top of v4.14-rc4
- Remove superfluous continue statement in parse_dt_topology()
[01/04]
- Remove 'cpu capacity scale management' and 'cpu capacity table'
related comments [01/04]
- Remove dt related patches [02-04/04]
Dietmar Eggemann (1):
arm: topology: remove cpu_efficiency
arch/arm/kernel/topology.c | 132 ++-------------------------------------------
1 file changed, 4 insertions(+), 128 deletions(-)
--
2.11.0
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/1] arm: topology: remove cpu_efficiency
2017-10-12 14:00 [PATCH v2 0/1] arm: remove cpu_efficiency Dietmar Eggemann
@ 2017-10-12 14:00 ` Dietmar Eggemann
2017-10-17 12:28 ` Vincent Guittot
0 siblings, 1 reply; 5+ messages in thread
From: Dietmar Eggemann @ 2017-10-12 14:00 UTC (permalink / raw)
To: linux-arm-kernel
Remove the 'cpu_efficiency/clock-frequency dt property' based solution
to set cpu capacity which was only working for Cortex-A15/A7 arm
big.LITTLE systems.
I.e. the 'capacity-dmips-mhz' based solution is now the only one. It is
shared between arm and arm64 and works for every big.LITTLE system no
matter which core types it consists of.
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Juri Lelli <juri.lelli@gmail.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
arch/arm/kernel/topology.c | 132 ++-------------------------------------------
1 file changed, 4 insertions(+), 128 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 24ac3cab411d..15cc131ae387 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -30,69 +30,11 @@
#include <asm/cputype.h>
#include <asm/topology.h>
-/*
- * cpu capacity scale management
- */
-
-/*
- * cpu capacity table
- * This per cpu data structure describes the relative capacity of each core.
- * On a heteregenous system, cores don't have the same computation capacity
- * and we reflect that difference in the cpu_capacity field so the scheduler
- * can take this difference into account during load balance. A per cpu
- * structure is preferred because each CPU updates its own cpu_capacity field
- * during the load balance except for idle cores. One idle core is selected
- * to run the rebalance_domains for all idle cores and the cpu_capacity can be
- * updated during this sequence.
- */
-
#ifdef CONFIG_OF
-struct cpu_efficiency {
- const char *compatible;
- unsigned long efficiency;
-};
-
-/*
- * Table of relative efficiency of each processors
- * The efficiency value must fit in 20bit and the final
- * cpu_scale value must be in the range
- * 0 < cpu_scale < 3*SCHED_CAPACITY_SCALE/2
- * in order to return@most 1 when DIV_ROUND_CLOSEST
- * is used to compute the capacity of a CPU.
- * Processors that are not defined in the table,
- * use the default SCHED_CAPACITY_SCALE value for cpu_scale.
- */
-static const struct cpu_efficiency table_efficiency[] = {
- {"arm,cortex-a15", 3891},
- {"arm,cortex-a7", 2048},
- {NULL, },
-};
-
-static unsigned long *__cpu_capacity;
-#define cpu_capacity(cpu) __cpu_capacity[cpu]
-
-static unsigned long middle_capacity = 1;
-static bool cap_from_dt = true;
-
-/*
- * Iterate all CPUs' descriptor in DT and compute the efficiency
- * (as per table_efficiency). Also calculate a middle efficiency
- * as close as possible to (max{eff_i} - min{eff_i}) / 2
- * This is later used to scale the cpu_capacity field such that an
- * 'average' CPU is of middle capacity. Also see the comments near
- * table_efficiency[] and update_cpu_capacity().
- */
static void __init parse_dt_topology(void)
{
- const struct cpu_efficiency *cpu_eff;
- struct device_node *cn = NULL;
- unsigned long min_capacity = ULONG_MAX;
- unsigned long max_capacity = 0;
- unsigned long capacity = 0;
- int cpu = 0;
-
- __cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
- GFP_NOWAIT);
+ struct device_node *cn;
+ int cpu;
cn = of_find_node_by_path("/cpus");
if (!cn) {
@@ -101,9 +43,6 @@ static void __init parse_dt_topology(void)
}
for_each_possible_cpu(cpu) {
- const u32 *rate;
- int len;
-
/* too early to use cpu->of_node */
cn = of_get_cpu_node(cpu, NULL);
if (!cn) {
@@ -111,76 +50,15 @@ static void __init parse_dt_topology(void)
continue;
}
- if (topology_parse_cpu_capacity(cn, cpu)) {
+ if (topology_parse_cpu_capacity(cn, cpu))
of_node_put(cn);
- continue;
- }
-
- cap_from_dt = false;
-
- for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
- if (of_device_is_compatible(cn, cpu_eff->compatible))
- break;
-
- if (cpu_eff->compatible == NULL)
- continue;
-
- rate = of_get_property(cn, "clock-frequency", &len);
- if (!rate || len != 4) {
- pr_err("%pOF missing clock-frequency property\n", cn);
- continue;
- }
-
- capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
-
- /* Save min capacity of the system */
- if (capacity < min_capacity)
- min_capacity = capacity;
-
- /* Save max capacity of the system */
- if (capacity > max_capacity)
- max_capacity = capacity;
-
- cpu_capacity(cpu) = capacity;
}
- /* If min and max capacities are equals, we bypass the update of the
- * cpu_scale because all CPUs have the same capacity. Otherwise, we
- * compute a middle_capacity factor that will ensure that the capacity
- * of an 'average' CPU of the system will be as close as possible to
- * SCHED_CAPACITY_SCALE, which is the default value, but with the
- * constraint explained near table_efficiency[].
- */
- if (4*max_capacity < (3*(max_capacity + min_capacity)))
- middle_capacity = (min_capacity + max_capacity)
- >> (SCHED_CAPACITY_SHIFT+1);
- else
- middle_capacity = ((max_capacity / 3)
- >> (SCHED_CAPACITY_SHIFT-1)) + 1;
-
- if (cap_from_dt)
- topology_normalize_cpu_scale();
-}
-
-/*
- * Look for a customed capacity of a CPU in the cpu_capacity table during the
- * boot. The update of all CPUs is in O(n^2) for heteregeneous system but the
- * function returns directly for SMP system.
- */
-static void update_cpu_capacity(unsigned int cpu)
-{
- if (!cpu_capacity(cpu) || cap_from_dt)
- return;
-
- topology_set_cpu_scale(cpu, cpu_capacity(cpu) / middle_capacity);
-
- pr_info("CPU%u: update cpu_capacity %lu\n",
- cpu, topology_get_cpu_scale(NULL, cpu));
+ topology_normalize_cpu_scale();
}
#else
static inline void parse_dt_topology(void) {}
-static inline void update_cpu_capacity(unsigned int cpuid) {}
#endif
/*
@@ -276,8 +154,6 @@ void store_cpu_topology(unsigned int cpuid)
update_siblings_masks(cpuid);
- update_cpu_capacity(cpuid);
-
pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,
cpu_topology[cpuid].core_id,
--
2.11.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 1/1] arm: topology: remove cpu_efficiency
2017-10-12 14:00 ` [PATCH v2 1/1] arm: topology: " Dietmar Eggemann
@ 2017-10-17 12:28 ` Vincent Guittot
2017-10-18 10:37 ` Dietmar Eggemann
0 siblings, 1 reply; 5+ messages in thread
From: Vincent Guittot @ 2017-10-17 12:28 UTC (permalink / raw)
To: linux-arm-kernel
Hi Dietmar,
On 12 October 2017 at 16:00, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
> Remove the 'cpu_efficiency/clock-frequency dt property' based solution
> to set cpu capacity which was only working for Cortex-A15/A7 arm
> big.LITTLE systems.
>
> I.e. the 'capacity-dmips-mhz' based solution is now the only one. It is
> shared between arm and arm64 and works for every big.LITTLE system no
> matter which core types it consists of.
>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Vincent Guittot <vincent.guittot@linaro.org>
> Cc: Juri Lelli <juri.lelli@gmail.com>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
> ---
> arch/arm/kernel/topology.c | 132 ++-------------------------------------------
> 1 file changed, 4 insertions(+), 128 deletions(-)
>
> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> index 24ac3cab411d..15cc131ae387 100644
> --- a/arch/arm/kernel/topology.c
> +++ b/arch/arm/kernel/topology.c
> @@ -30,69 +30,11 @@
> #include <asm/cputype.h>
> #include <asm/topology.h>
>
> -/*
> - * cpu capacity scale management
> - */
> -
> -/*
> - * cpu capacity table
> - * This per cpu data structure describes the relative capacity of each core.
> - * On a heteregenous system, cores don't have the same computation capacity
> - * and we reflect that difference in the cpu_capacity field so the scheduler
> - * can take this difference into account during load balance. A per cpu
> - * structure is preferred because each CPU updates its own cpu_capacity field
> - * during the load balance except for idle cores. One idle core is selected
> - * to run the rebalance_domains for all idle cores and the cpu_capacity can be
> - * updated during this sequence.
> - */
> -
> #ifdef CONFIG_OF
> -struct cpu_efficiency {
> - const char *compatible;
> - unsigned long efficiency;
> -};
> -
> -/*
> - * Table of relative efficiency of each processors
> - * The efficiency value must fit in 20bit and the final
> - * cpu_scale value must be in the range
> - * 0 < cpu_scale < 3*SCHED_CAPACITY_SCALE/2
> - * in order to return at most 1 when DIV_ROUND_CLOSEST
> - * is used to compute the capacity of a CPU.
> - * Processors that are not defined in the table,
> - * use the default SCHED_CAPACITY_SCALE value for cpu_scale.
> - */
> -static const struct cpu_efficiency table_efficiency[] = {
> - {"arm,cortex-a15", 3891},
> - {"arm,cortex-a7", 2048},
> - {NULL, },
> -};
> -
> -static unsigned long *__cpu_capacity;
> -#define cpu_capacity(cpu) __cpu_capacity[cpu]
> -
> -static unsigned long middle_capacity = 1;
> -static bool cap_from_dt = true;
> -
> -/*
> - * Iterate all CPUs' descriptor in DT and compute the efficiency
> - * (as per table_efficiency). Also calculate a middle efficiency
> - * as close as possible to (max{eff_i} - min{eff_i}) / 2
> - * This is later used to scale the cpu_capacity field such that an
> - * 'average' CPU is of middle capacity. Also see the comments near
> - * table_efficiency[] and update_cpu_capacity().
> - */
> static void __init parse_dt_topology(void)
> {
> - const struct cpu_efficiency *cpu_eff;
> - struct device_node *cn = NULL;
> - unsigned long min_capacity = ULONG_MAX;
> - unsigned long max_capacity = 0;
> - unsigned long capacity = 0;
> - int cpu = 0;
> -
> - __cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
> - GFP_NOWAIT);
> + struct device_node *cn;
> + int cpu;
>
> cn = of_find_node_by_path("/cpus");
> if (!cn) {
> @@ -101,9 +43,6 @@ static void __init parse_dt_topology(void)
> }
>
> for_each_possible_cpu(cpu) {
> - const u32 *rate;
> - int len;
> -
> /* too early to use cpu->of_node */
> cn = of_get_cpu_node(cpu, NULL);
> if (!cn) {
> @@ -111,76 +50,15 @@ static void __init parse_dt_topology(void)
> continue;
> }
>
> - if (topology_parse_cpu_capacity(cn, cpu)) {
> + if (topology_parse_cpu_capacity(cn, cpu))
> of_node_put(cn);
We should call the of_node_put unconditionally to balance the
of_get_cpu_node, isn't it ?
Note that this problem is also present without your change
> - continue;
> - }
> -
> - cap_from_dt = false;
> -
> - for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
> - if (of_device_is_compatible(cn, cpu_eff->compatible))
> - break;
> -
> - if (cpu_eff->compatible == NULL)
> - continue;
> -
> - rate = of_get_property(cn, "clock-frequency", &len);
> - if (!rate || len != 4) {
> - pr_err("%pOF missing clock-frequency property\n", cn);
> - continue;
> - }
> -
> - capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
> -
> - /* Save min capacity of the system */
> - if (capacity < min_capacity)
> - min_capacity = capacity;
> -
> - /* Save max capacity of the system */
> - if (capacity > max_capacity)
> - max_capacity = capacity;
> -
> - cpu_capacity(cpu) = capacity;
> }
>
> - /* If min and max capacities are equals, we bypass the update of the
> - * cpu_scale because all CPUs have the same capacity. Otherwise, we
> - * compute a middle_capacity factor that will ensure that the capacity
> - * of an 'average' CPU of the system will be as close as possible to
> - * SCHED_CAPACITY_SCALE, which is the default value, but with the
> - * constraint explained near table_efficiency[].
> - */
> - if (4*max_capacity < (3*(max_capacity + min_capacity)))
> - middle_capacity = (min_capacity + max_capacity)
> - >> (SCHED_CAPACITY_SHIFT+1);
> - else
> - middle_capacity = ((max_capacity / 3)
> - >> (SCHED_CAPACITY_SHIFT-1)) + 1;
> -
> - if (cap_from_dt)
> - topology_normalize_cpu_scale();
> -}
> -
> -/*
> - * Look for a customed capacity of a CPU in the cpu_capacity table during the
> - * boot. The update of all CPUs is in O(n^2) for heteregeneous system but the
> - * function returns directly for SMP system.
> - */
> -static void update_cpu_capacity(unsigned int cpu)
> -{
> - if (!cpu_capacity(cpu) || cap_from_dt)
> - return;
> -
> - topology_set_cpu_scale(cpu, cpu_capacity(cpu) / middle_capacity);
> -
> - pr_info("CPU%u: update cpu_capacity %lu\n",
> - cpu, topology_get_cpu_scale(NULL, cpu));
> + topology_normalize_cpu_scale();
> }
>
> #else
> static inline void parse_dt_topology(void) {}
> -static inline void update_cpu_capacity(unsigned int cpuid) {}
> #endif
>
> /*
> @@ -276,8 +154,6 @@ void store_cpu_topology(unsigned int cpuid)
>
> update_siblings_masks(cpuid);
>
> - update_cpu_capacity(cpuid);
> -
> pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
> cpuid, cpu_topology[cpuid].thread_id,
> cpu_topology[cpuid].core_id,
> --
> 2.11.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/1] arm: topology: remove cpu_efficiency
2017-10-17 12:28 ` Vincent Guittot
@ 2017-10-18 10:37 ` Dietmar Eggemann
2017-10-19 7:32 ` Vincent Guittot
0 siblings, 1 reply; 5+ messages in thread
From: Dietmar Eggemann @ 2017-10-18 10:37 UTC (permalink / raw)
To: linux-arm-kernel
Hi Vincent,
On 17/10/17 13:28, Vincent Guittot wrote:
> Hi Dietmar,
>
> On 12 October 2017 at 16:00, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
>> Remove the 'cpu_efficiency/clock-frequency dt property' based solution
>> to set cpu capacity which was only working for Cortex-A15/A7 arm
>> big.LITTLE systems.
>>
>> I.e. the 'capacity-dmips-mhz' based solution is now the only one. It is
>> shared between arm and arm64 and works for every big.LITTLE system no
>> matter which core types it consists of.
>>
>> Cc: Russell King <linux@arm.linux.org.uk>
>> Cc: Vincent Guittot <vincent.guittot@linaro.org>
>> Cc: Juri Lelli <juri.lelli@gmail.com>
>> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
[...]
>> @@ -111,76 +50,15 @@ static void __init parse_dt_topology(void)
>> continue;
>> }
>>
>> - if (topology_parse_cpu_capacity(cn, cpu)) {
>> + if (topology_parse_cpu_capacity(cn, cpu))
>> of_node_put(cn);
>
> We should call the of_node_put unconditionally to balance the
> of_get_cpu_node, isn't it ?
> Note that this problem is also present without your change
Thanks for the review. Brendan mentioned this the other day already.
I could add an additional patch to the v3 with this code change. What do
you think?
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 15cc131ae387..81ec42333489 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -41,6 +41,7 @@ static void __init parse_dt_topology(void)
pr_err("No CPU information found in DT\n");
return;
}
+ of_node_put(cn);
for_each_possible_cpu(cpu) {
/* too early to use cpu->of_node */
@@ -50,8 +51,8 @@ static void __init parse_dt_topology(void)
continue;
}
- if (topology_parse_cpu_capacity(cn, cpu))
- of_node_put(cn);
+ topology_parse_cpu_capacity(cn, cpu);
+ of_node_put(cn);
}
topology_normalize_cpu_scale();
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 1/1] arm: topology: remove cpu_efficiency
2017-10-18 10:37 ` Dietmar Eggemann
@ 2017-10-19 7:32 ` Vincent Guittot
0 siblings, 0 replies; 5+ messages in thread
From: Vincent Guittot @ 2017-10-19 7:32 UTC (permalink / raw)
To: linux-arm-kernel
Hi Dietmar,
On 18 October 2017 at 12:37, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
> Hi Vincent,
>
> On 17/10/17 13:28, Vincent Guittot wrote:
>> Hi Dietmar,
>>
>> On 12 October 2017 at 16:00, Dietmar Eggemann <dietmar.eggemann@arm.com> wrote:
>>> Remove the 'cpu_efficiency/clock-frequency dt property' based solution
>>> to set cpu capacity which was only working for Cortex-A15/A7 arm
>>> big.LITTLE systems.
>>>
>>> I.e. the 'capacity-dmips-mhz' based solution is now the only one. It is
>>> shared between arm and arm64 and works for every big.LITTLE system no
>>> matter which core types it consists of.
>>>
>>> Cc: Russell King <linux@arm.linux.org.uk>
>>> Cc: Vincent Guittot <vincent.guittot@linaro.org>
>>> Cc: Juri Lelli <juri.lelli@gmail.com>
>>> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
>
> [...]
>
>>> @@ -111,76 +50,15 @@ static void __init parse_dt_topology(void)
>>> continue;
>>> }
>>>
>>> - if (topology_parse_cpu_capacity(cn, cpu)) {
>>> + if (topology_parse_cpu_capacity(cn, cpu))
>>> of_node_put(cn);
>>
>> We should call the of_node_put unconditionally to balance the
>> of_get_cpu_node, isn't it ?
>> Note that this problem is also present without your change
>
> Thanks for the review. Brendan mentioned this the other day already.
>
> I could add an additional patch to the v3 with this code change. What do
> you think?
The changes looks good to me
>
> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> index 15cc131ae387..81ec42333489 100644
> --- a/arch/arm/kernel/topology.c
> +++ b/arch/arm/kernel/topology.c
> @@ -41,6 +41,7 @@ static void __init parse_dt_topology(void)
> pr_err("No CPU information found in DT\n");
> return;
> }
> + of_node_put(cn);
>
> for_each_possible_cpu(cpu) {
> /* too early to use cpu->of_node */
> @@ -50,8 +51,8 @@ static void __init parse_dt_topology(void)
> continue;
> }
>
> - if (topology_parse_cpu_capacity(cn, cpu))
> - of_node_put(cn);
> + topology_parse_cpu_capacity(cn, cpu);
> + of_node_put(cn);
> }
>
> topology_normalize_cpu_scale();
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
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