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Subject[PATCH] tasklet cleanup
Date
Linus, please apply.

Name: Tasklet Per-CPU Cleanup Patch
Author: Rusty Russell
Status: Cleanup

D: This makes tasklet_vec and tasklet_hi_vec static inside softirq.c, and
D: makes them __per_cpu_data.

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.7-pre1/include/linux/interrupt.h working-2.5.7-pre1-percpu-sched/include/linux/interrupt.h
--- linux-2.5.7-pre1/include/linux/interrupt.h Fri Mar 15 13:01:00 2002
+++ working-2.5.7-pre1-percpu-sched/include/linux/interrupt.h Fri Mar 15 14:02:23 2002
@@ -124,14 +124,6 @@
TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
};

-struct tasklet_head
-{
- struct tasklet_struct *list;
-} __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
-
-extern struct tasklet_head tasklet_vec[NR_CPUS];
-extern struct tasklet_head tasklet_hi_vec[NR_CPUS];
-
#ifdef CONFIG_SMP
static inline int tasklet_trylock(struct tasklet_struct *t)
{
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.7-pre1/kernel/ksyms.c working-2.5.7-pre1-percpu-sched/kernel/ksyms.c
--- linux-2.5.7-pre1/kernel/ksyms.c Wed Mar 13 13:30:39 2002
+++ working-2.5.7-pre1-percpu-sched/kernel/ksyms.c Fri Mar 15 14:11:36 2002
@@ -565,8 +565,6 @@
EXPORT_SYMBOL(strsep);

/* software interrupts */
-EXPORT_SYMBOL(tasklet_hi_vec);
-EXPORT_SYMBOL(tasklet_vec);
EXPORT_SYMBOL(bh_task_vec);
EXPORT_SYMBOL(init_bh);
EXPORT_SYMBOL(remove_bh);
diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.7-pre1/kernel/softirq.c working-2.5.7-pre1-percpu-sched/kernel/softirq.c
--- linux-2.5.7-pre1/kernel/softirq.c Wed Feb 20 17:56:17 2002
+++ working-2.5.7-pre1-percpu-sched/kernel/softirq.c Fri Mar 15 14:02:45 2002
@@ -16,6 +16,7 @@
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/tqueue.h>
+#include <linux/percpu.h>

/*
- No shared variables, all the data are CPU local.
@@ -145,42 +146,43 @@


/* Tasklets */
+struct tasklet_head
+{
+ struct tasklet_struct *list;
+};

-struct tasklet_head tasklet_vec[NR_CPUS] __cacheline_aligned_in_smp;
-struct tasklet_head tasklet_hi_vec[NR_CPUS] __cacheline_aligned_in_smp;
+static struct tasklet_head tasklet_vec __per_cpu_data;
+static struct tasklet_head tasklet_hi_vec __per_cpu_data;

void __tasklet_schedule(struct tasklet_struct *t)
{
- int cpu = smp_processor_id();
unsigned long flags;

local_irq_save(flags);
- t->next = tasklet_vec[cpu].list;
- tasklet_vec[cpu].list = t;
- cpu_raise_softirq(cpu, TASKLET_SOFTIRQ);
+ t->next = this_cpu(tasklet_vec).list;
+ this_cpu(tasklet_vec).list = t;
+ cpu_raise_softirq(smp_processor_id(), TASKLET_SOFTIRQ);
local_irq_restore(flags);
}

void __tasklet_hi_schedule(struct tasklet_struct *t)
{
- int cpu = smp_processor_id();
unsigned long flags;

local_irq_save(flags);
- t->next = tasklet_hi_vec[cpu].list;
- tasklet_hi_vec[cpu].list = t;
- cpu_raise_softirq(cpu, HI_SOFTIRQ);
+ t->next = this_cpu(tasklet_hi_vec).list;
+ this_cpu(tasklet_hi_vec).list = t;
+ cpu_raise_softirq(smp_processor_id(), HI_SOFTIRQ);
local_irq_restore(flags);
}

static void tasklet_action(struct softirq_action *a)
{
- int cpu = smp_processor_id();
struct tasklet_struct *list;

local_irq_disable();
- list = tasklet_vec[cpu].list;
- tasklet_vec[cpu].list = NULL;
+ list = this_cpu(tasklet_vec).list;
+ this_cpu(tasklet_vec).list = NULL;
local_irq_enable();

while (list) {
@@ -200,21 +202,20 @@
}

local_irq_disable();
- t->next = tasklet_vec[cpu].list;
- tasklet_vec[cpu].list = t;
- __cpu_raise_softirq(cpu, TASKLET_SOFTIRQ);
+ t->next = this_cpu(tasklet_vec).list;
+ this_cpu(tasklet_vec).list = t;
+ __cpu_raise_softirq(smp_processor_id(), TASKLET_SOFTIRQ);
local_irq_enable();
}
}

static void tasklet_hi_action(struct softirq_action *a)
{
- int cpu = smp_processor_id();
struct tasklet_struct *list;

local_irq_disable();
- list = tasklet_hi_vec[cpu].list;
- tasklet_hi_vec[cpu].list = NULL;
+ list = this_cpu(tasklet_hi_vec).list;
+ this_cpu(tasklet_hi_vec).list = NULL;
local_irq_enable();

while (list) {
@@ -234,9 +235,9 @@
}

local_irq_disable();
- t->next = tasklet_hi_vec[cpu].list;
- tasklet_hi_vec[cpu].list = t;
- __cpu_raise_softirq(cpu, HI_SOFTIRQ);
+ t->next = this_cpu(tasklet_hi_vec).list;
+ this_cpu(tasklet_hi_vec).list = t;
+ __cpu_raise_softirq(smp_processor_id(), HI_SOFTIRQ);
local_irq_enable();
}
}

--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
-
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