intel_idle: shrink states tables

PATCH In review Bartlomiej Zolnierkiewicz 3 participants 3 messages Aug 30, 2013 – Sep 2, 2013 Intel idle driver

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Bartlomiej Zolnierkiewicz

author

2013-08-30 10:25 UTC #0 lore raw

PATCH 1/3 intel_idle: shrink states tables

There is no reason to define CPUIDLE_STATE_MAX (currently 10) entries in states tables if the driver always stops iterating over table when it encounters first .enter == NULL entry.

$ size drivers/idle/intel_idle.o.*
   text    data     bss     dec     hex filename
   2886    5440      32    8358    20a6 drivers/idle/intel_idle.o.before
   2886    3752      32    6670    1a0e drivers/idle/intel_idle.o.after

Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>

Signed-off-by Kyungmin Park <[email protected]>

Cc Len Brown <[email protected]>

---
 drivers/idle/intel_idle.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

drivers/idle/intel_idle.c +6 -6

index fa6964d..9c97fbb42 100644
@@ -123,7 +123,7 @@ static struct cpuidle_state *cpuidle_state_table;
  * which is also the index into the MWAIT hint array.
  * Thus C0 is a dummy.
  */
-static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state nehalem_cstates[] = {
 	{
 		.name = "C1-NHM",
 		.desc = "MWAIT 0x00",

@@ -156,7 +156,7 @@ static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state snb_cstates[] = {
 	{
 		.name = "C1-SNB",
 		.desc = "MWAIT 0x00",

@@ -196,7 +196,7 @@ static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state ivb_cstates[] = {
 	{
 		.name = "C1-IVB",
 		.desc = "MWAIT 0x00",

@@ -236,7 +236,7 @@ static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state hsw_cstates[] = {
 	{
 		.name = "C1-HSW",
 		.desc = "MWAIT 0x00",

@@ -297,7 +297,7 @@ static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state atom_cstates[] = {
 	{
 		.name = "C1E-ATM",
 		.desc = "MWAIT 0x00",

@@ -628,7 +628,7 @@ static int intel_idle_cpu_init(int cpu)
 		int num_substates, mwait_hint, mwait_cstate, mwait_substate;
 
 		if (cpuidle_state_table[cstate].enter == NULL)
-			continue;
+			break;
 
 		if (cstate + 1 > max_cstate) {
 			printk(PREFIX "max_cstate %d reached\n", max_cstate);

Signature · 1 line

1.8.2.3

Rafael J. Wysocki

2013-08-30 11:52 UTC #1 lore raw

Quoted 4 lines · Bartlomiej Zolnierkiewicz

There is no reason to define CPUIDLE_STATE_MAX (currently 10) entries in states tables if the driver always stops iterating over table when it encounters first .enter == NULL entry.

Quoted 8 lines

$ size drivers/idle/intel_idle.o.*
   text    data     bss     dec     hex filename
   2886    5440      32    8358    20a6 drivers/idle/intel_idle.o.before
   2886    3752      32    6670    1a0e drivers/idle/intel_idle.o.after
Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by Kyungmin Park <[email protected]>
Cc Len Brown <[email protected]>

Thanks, I'll queue this series up for 3.13.

Quoted 63 lines

---
 drivers/idle/intel_idle.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

drivers/idle/intel_idle.c +6 -6

index fa6964d..9c97fbb42 100644
@@ -123,7 +123,7 @@ static struct cpuidle_state *cpuidle_state_table;
  * which is also the index into the MWAIT hint array.
  * Thus C0 is a dummy.
  */
-static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state nehalem_cstates[] = {
 	{
 		.name = "C1-NHM",
 		.desc = "MWAIT 0x00",

@@ -156,7 +156,7 @@ static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state snb_cstates[] = {
 	{
 		.name = "C1-SNB",
 		.desc = "MWAIT 0x00",

@@ -196,7 +196,7 @@ static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state ivb_cstates[] = {
 	{
 		.name = "C1-IVB",
 		.desc = "MWAIT 0x00",

@@ -236,7 +236,7 @@ static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state hsw_cstates[] = {
 	{
 		.name = "C1-HSW",
 		.desc = "MWAIT 0x00",

@@ -297,7 +297,7 @@ static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state atom_cstates[] = {
 	{
 		.name = "C1E-ATM",
 		.desc = "MWAIT 0x00",

@@ -628,7 +628,7 @@ static int intel_idle_cpu_init(int cpu)
 		int num_substates, mwait_hint, mwait_cstate, mwait_substate;
 
 		if (cpuidle_state_table[cstate].enter == NULL)
-			continue;
+			break;
 
 		if (cstate + 1 > max_cstate) {
 			printk(PREFIX "max_cstate %d reached\n", max_cstate);

Signature · 2 lines

I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

Daniel Lezcano

Acked-by on v1 1/3

2013-09-02 09:30 UTC #2 lore raw

In reply to Bartlomiej Zolnierkiewicz

Quoted 9 lines · Bartlomiej Zolnierkiewicz

There is no reason to define CPUIDLE_STATE_MAX (currently 10) entries in states tables if the driver always stops iterating over table when it encounters first .enter == NULL entry.
$ size drivers/idle/intel_idle.o.*
   text    data     bss     dec     hex filename
   2886    5440      32    8358    20a6 drivers/idle/intel_idle.o.before
   2886    3752      32    6670    1a0e drivers/idle/intel_idle.o.after

Quoted 4 lines

Signed-off-by Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by Kyungmin Park <[email protected]>
Cc Len Brown <[email protected]>
---

Acked-by Daniel Lezcano <[email protected]>

Quoted 62 lines

 drivers/idle/intel_idle.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

drivers/idle/intel_idle.c +6 -6

index fa6964d..9c97fbb42 100644
@@ -123,7 +123,7 @@ static struct cpuidle_state *cpuidle_state_table;
  * which is also the index into the MWAIT hint array.
  * Thus C0 is a dummy.
  */
-static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state nehalem_cstates[] = {
 	{
 		.name = "C1-NHM",
 		.desc = "MWAIT 0x00",

@@ -156,7 +156,7 @@ static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state snb_cstates[] = {
 	{
 		.name = "C1-SNB",
 		.desc = "MWAIT 0x00",

@@ -196,7 +196,7 @@ static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state ivb_cstates[] = {
 	{
 		.name = "C1-IVB",
 		.desc = "MWAIT 0x00",

@@ -236,7 +236,7 @@ static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state hsw_cstates[] = {
 	{
 		.name = "C1-HSW",
 		.desc = "MWAIT 0x00",

@@ -297,7 +297,7 @@ static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
 		.enter = NULL }
 };
 
-static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] = {
+static struct cpuidle_state atom_cstates[] = {
 	{
 		.name = "C1E-ATM",
 		.desc = "MWAIT 0x00",

@@ -628,7 +628,7 @@ static int intel_idle_cpu_init(int cpu)
 		int num_substates, mwait_hint, mwait_cstate, mwait_substate;
 
 		if (cpuidle_state_table[cstate].enter == NULL)
-			continue;
+			break;
 
 		if (cstate + 1 > max_cstate) {
 			printk(PREFIX "max_cstate %d reached\n", max_cstate);

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