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Subject[PATCH 31/33] replace loop with nr_irqs with for_each_irq_desc
Date
so don't all get_irq_desc at begining to allocate all.
and only call that when needed

/proc/interrupts related still use old ways... for compatablilty reason.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
arch/x86/kernel/io_apic_64.c | 30 +++++++++++++++---------------
arch/x86/kernel/irq_64.c | 5 ++---
arch/x86/kernel/irqinit_64.c | 17 +++++------------
fs/proc/proc_misc.c | 7 +++++--
include/linux/irq.h | 18 ++++++++++++++++++
kernel/irq/handle.c | 31 ++++++++++++++++++++++++++-----
kernel/irq/internals.h | 4 ++--
kernel/irq/manage.c | 2 +-
kernel/irq/proc.c | 10 +++++-----
9 files changed, 79 insertions(+), 45 deletions(-)
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index c8e4613..8bb6565 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -129,6 +129,9 @@ static void __init init_work(void *data)
cfg[i-1].next = &cfg[i];
}

+#define for_each_irq_cfg(cfg) \
+ for(cfg = irq_cfgx; cfg && cfg->irq != -1U; cfg = cfg->next)
+
static struct irq_cfg *irq_cfgx;
DEFINE_DYN_ARRAY(irq_cfgx, sizeof(struct irq_cfg), nr_irq_cfg, PAGE_SIZE, init_work);

@@ -1063,20 +1066,18 @@ static void __setup_vector_irq(int cpu)
/* Initialize vector_irq on a new cpu */
/* This function must be called with vector_lock held */
int irq, vector;
+ struct irq_cfg *cfg;

/* Mark the inuse vectors */
- for (irq = 0; irq < nr_irqs; ++irq) {
- struct irq_cfg *cfg = get_irq_cfg(irq);
-
+ for_each_irq_cfg(cfg) {
if (!cpu_isset(cpu, cfg->domain))
continue;
vector = cfg->vector;
+ irq = cfg->irq;
per_cpu(vector_irq, cpu)[vector] = irq;
}
/* Mark the free vectors */
for (vector = 0; vector < NR_VECTORS; ++vector) {
- struct irq_cfg *cfg;
-
irq = per_cpu(vector_irq, cpu)[vector];
if (irq < 0)
continue;
@@ -1312,6 +1313,7 @@ __apicdebuginit(void) print_IO_APIC(void)
union IO_APIC_reg_01 reg_01;
union IO_APIC_reg_02 reg_02;
unsigned long flags;
+ struct irq_cfg *cfg;

if (apic_verbosity == APIC_QUIET)
return;
@@ -1380,12 +1382,11 @@ __apicdebuginit(void) print_IO_APIC(void)
}
}
printk(KERN_DEBUG "IRQ to pin mappings:\n");
- for (i = 0; i < nr_irqs; i++) {
- struct irq_cfg *cfg = get_irq_cfg(i);
+ for_each_irq_cfg(cfg) {
struct irq_pin_list *entry = cfg->irq_2_pin;
if (!entry)
continue;
- printk(KERN_DEBUG "IRQ%d ", i);
+ printk(KERN_DEBUG "IRQ%d ", cfg->irq);
for (;;) {
printk("-> %d:%d", entry->apic, entry->pin);
if (!entry->next)
@@ -1845,10 +1846,10 @@ unmask:

static void ir_irq_migration(struct work_struct *work)
{
- int irq;
+ unsigned int irq;
+ struct irq_desc *desc;

- for (irq = 0; irq < nr_irqs; irq++) {
- struct irq_desc *desc = get_irq_desc(irq);
+ for_each_irq_desc(irq, desc) {
if (desc->status & IRQ_MOVE_PENDING) {
unsigned long flags;

@@ -2044,6 +2045,7 @@ static inline void init_IO_APIC_traps(void)
{
int irq;
struct irq_desc *desc;
+ struct irq_cfg *cfg;

/*
* NOTE! The local APIC isn't very good at handling
@@ -2056,10 +2058,8 @@ static inline void init_IO_APIC_traps(void)
* Also, we've got to be careful not to trash gate
* 0x80, because int 0x80 is hm, kind of importantish. ;)
*/
- for (irq = 0; irq < nr_irqs ; irq++) {
- struct irq_cfg *cfg;
-
- cfg = get_irq_cfg(irq);
+ for_each_irq_cfg(cfg) {
+ irq = cfg->irq;
if (IO_APIC_IRQ(irq) && !cfg->vector) {
/*
* Hmm.. We don't have an entry for this,
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index dde7191..c2fe49f 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -224,17 +224,16 @@ void fixup_irqs(cpumask_t map)
{
unsigned int irq;
static int warned;
+ struct irq_desc *desc;

- for (irq = 0; irq < nr_irqs; irq++) {
+ for_each_irq_desc(irq, desc) {
cpumask_t mask;
int break_affinity = 0;
int set_affinity = 1;
- struct irq_desc *desc;

if (irq == 2)
continue;

- desc = get_irq_desc(irq);
/* interrupt's are disabled at this point */
spin_lock(&desc->lock);

diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c
index 8a7a5a8..daed12a 100644
--- a/arch/x86/kernel/irqinit_64.c
+++ b/arch/x86/kernel/irqinit_64.c
@@ -142,25 +142,18 @@ static void __init init_ISA_irqs (void)
init_bsp_APIC();
init_8259A(0);

- for (i = 0; i < nr_irqs; i++) {
+ for (i = 0; i < 16; i++) {
struct irq_desc *desc = get_irq_desc(i);

desc->status = IRQ_DISABLED;
desc->action = NULL;
desc->depth = 1;

- if (i < 16) {
- /*
- * 16 old-style INTA-cycle interrupts:
- */
- set_irq_chip_and_handler_name(i, &i8259A_chip,
+ /*
+ * 16 old-style INTA-cycle interrupts:
+ */
+ set_irq_chip_and_handler_name(i, &i8259A_chip,
handle_level_irq, "XT");
- } else {
- /*
- * 'high' PCI IRQs filled in on demand
- */
- desc->chip = &no_irq_chip;
- }
}
}

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index aeb0a40..32de344 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -502,6 +502,7 @@ static int show_stat(struct seq_file *p, void *v)
u64 sum = 0;
struct timespec boottime;
unsigned int *per_irq_sum;
+ struct irq_desc *desc;

per_irq_sum = kzalloc(sizeof(unsigned int)*nr_irqs, GFP_KERNEL);
if (!per_irq_sum)
@@ -525,8 +526,10 @@ static int show_stat(struct seq_file *p, void *v)
softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
- for (j = 0; j < nr_irqs; j++) {
- unsigned int temp = kstat_irqs_cpu(j, i);
+ for_each_irq_desc(j, desc) {
+ unsigned int temp;
+
+ temp = kstat_irqs_cpu(j, i);
sum += temp;
per_irq_sum[j] += temp;
}
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 7fbc9c2..621abf4 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -193,10 +193,28 @@ struct irq_desc {
} ____cacheline_internodealigned_in_smp;

extern struct irq_desc *get_irq_desc(unsigned int irq);
+extern struct irq_desc *get_irq_desc_without_new(unsigned int irq);
+
+#ifndef CONFIG_HAVE_SPARSE_IRQ
+
#ifndef CONFIG_HAVE_DYN_ARRAY
/* could be removed if we get rid of all irq_desc reference */
extern struct irq_desc irq_desc[NR_IRQS];
+#else
+extern struct irq_desc *irq_desc;
+#endif
+
+#define for_each_irq_desc(irq, desc) \
+ for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc = &irq_desc[irq])
+
+#else
+
+extern struct irq_desc *irq_descX;
+#define for_each_irq_desc(irqX, desc) \
+ for (desc = irq_descX, irqX = desc->irq; desc && irqX != -1U; desc = desc->next, irqX = desc ? desc->irq: -1U)
+
#endif
+
#define kstat_irqs_this_cpu(DESC) \
((DESC)->kstat_irqs[smp_processor_id()])

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 67f8d9d..a2750b8 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -111,7 +111,6 @@ static void init_kstat_irqs(struct irq_desc *desc, int nr_desc, int nr)
}
}

-
static void __init init_work(void *data)
{
struct dyn_array *da = data;
@@ -148,9 +147,27 @@ static int __init parse_nr_irq_desc(char *arg)

early_param("nr_irq_desc", parse_nr_irq_desc);

-static struct irq_desc *irq_desc;
-DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irq_desc, PAGE_SIZE, init_work);
+struct irq_desc *irq_descX;
+DEFINE_DYN_ARRAY(irq_descX, sizeof(struct irq_desc), nr_irq_desc, PAGE_SIZE, init_work);

+struct irq_desc *get_irq_desc_without_new(unsigned int irq)
+{
+ struct irq_desc *desc;
+
+ BUG_ON(irq == -1U);
+
+ desc = &irq_descX[0];
+ while (desc) {
+ if (desc->irq == irq)
+ return desc;
+
+ if (desc->irq == -1U)
+ return NULL;
+
+ desc = desc->next;
+ }
+ return NULL;
+}
struct irq_desc *get_irq_desc(unsigned int irq)
{
struct irq_desc *desc, *desc_pri;
@@ -161,7 +178,7 @@ struct irq_desc *get_irq_desc(unsigned int irq)

BUG_ON(irq == -1U);

- desc_pri = desc = &irq_desc[0];
+ desc_pri = desc = &irq_descX[0];
while (desc) {
if (desc->irq == irq)
return desc;
@@ -208,7 +225,7 @@ struct irq_desc *get_irq_desc(unsigned int irq)
}
#else

-static struct irq_desc *irq_desc;
+struct irq_desc *irq_desc;
DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irqs, PAGE_SIZE, init_work);

#endif
@@ -238,6 +255,10 @@ struct irq_desc *get_irq_desc(unsigned int irq)

return NULL;
}
+struct irq_desc *get_irq_desc_without_new(unsigned int irq)
+{
+ return get_irq_desc(irq);
+}
#endif

/*
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 08a849a..605e88c 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -11,11 +11,11 @@ extern void irq_chip_set_defaults(struct irq_chip *chip);
extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);

#ifdef CONFIG_PROC_FS
-extern void register_irq_proc(unsigned int irq);
+extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void register_handler_proc(unsigned int irq, struct irqaction *action);
extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
#else
-static inline void register_irq_proc(unsigned int irq) { }
+static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void register_handler_proc(unsigned int irq,
struct irqaction *action) { }
static inline void unregister_handler_proc(unsigned int irq,
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index f199122..13db003 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -466,7 +466,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
spin_unlock_irqrestore(&desc->lock, flags);

new->irq = irq;
- register_irq_proc(irq);
+ register_irq_proc(irq, desc);
new->dir = NULL;
register_handler_proc(irq, new);

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 2d8b936..43c6c05 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -163,11 +163,10 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)

#define MAX_NAMELEN 10

-void register_irq_proc(unsigned int irq)
+void register_irq_proc(unsigned int irq, struct irq_desc *desc)
{
char name [MAX_NAMELEN];
struct proc_dir_entry *entry;
- struct irq_desc *desc = get_irq_desc(irq);

if (!root_irq_dir ||
(desc->chip == &no_irq_chip) || desc->dir)
@@ -226,7 +225,8 @@ void register_default_affinity_proc(void)

void init_irq_proc(void)
{
- int i;
+ unsigned irq;
+ struct irq_desc *desc;

/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", NULL);
@@ -238,7 +238,7 @@ void init_irq_proc(void)
/*
* Create entries for all existing IRQs.
*/
- for (i = 0; i < nr_irqs; i++)
- register_irq_proc(i);
+ for_each_irq_desc(irq, desc)
+ register_irq_proc(irq, desc);
}

--
1.5.4.5


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