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Date: Fri, 16 Jan 2009 16:32:25 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: Frédéric Weisbecker <fweisbec@...il.com>
CC: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] trace_workqueue: use percpu data for workqueue stat
Impact: use percpu data instead hardcode
Use
static DEFINE_PER_CPU(struct workqueue_global_stats, all_workqueue_stat);
instead of allocate it.
And percpu data works well on NUMA.
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
index f8118d3..4664990 100644
--- a/kernel/trace/trace_workqueue.c
+++ b/kernel/trace/trace_workqueue.c
@@ -8,6 +8,7 @@
#include <trace/workqueue.h>
#include <linux/list.h>
+#include <linux/percpu.h>
#include "trace_stat.h"
#include "trace.h"
@@ -37,7 +38,8 @@ struct workqueue_global_stats {
/* Don't need a global lock because allocated before the workqueues, and
* never freed.
*/
-static struct workqueue_global_stats *all_workqueue_stat;
+static DEFINE_PER_CPU(struct workqueue_global_stats, all_workqueue_stat);
+#define workqueue_cpu_stat(cpu) (&per_cpu(all_workqueue_stat, cpu))
/* Insertion of a work */
static void
@@ -48,8 +50,8 @@ probe_workqueue_insertion(struct task_struct *wq_thread,
struct cpu_workqueue_stats *node, *next;
unsigned long flags;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
list) {
if (node->pid == wq_thread->pid) {
atomic_inc(&node->inserted);
@@ -58,7 +60,7 @@ probe_workqueue_insertion(struct task_struct *wq_thread,
}
pr_debug("trace_workqueue: entry not found\n");
found:
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
}
/* Execution of a work */
@@ -70,8 +72,8 @@ probe_workqueue_execution(struct task_struct *wq_thread,
struct cpu_workqueue_stats *node, *next;
unsigned long flags;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
list) {
if (node->pid == wq_thread->pid) {
node->executed++;
@@ -80,7 +82,7 @@ probe_workqueue_execution(struct task_struct *wq_thread,
}
pr_debug("trace_workqueue: entry not found\n");
found:
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
}
/* Creation of a cpu workqueue thread */
@@ -104,11 +106,11 @@ static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
cws->pid = wq_thread->pid;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- if (list_empty(&all_workqueue_stat[cpu].list))
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (list_empty(&workqueue_cpu_stat(cpu)->list))
cws->first_entry = true;
- list_add_tail(&cws->list, &all_workqueue_stat[cpu].list);
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
}
/* Destruction of a cpu workqueue thread */
@@ -119,8 +121,8 @@ static void probe_workqueue_destruction(struct task_struct *wq_thread)
struct cpu_workqueue_stats *node, *next;
unsigned long flags;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
list) {
if (node->pid == wq_thread->pid) {
list_del(&node->list);
@@ -131,7 +133,7 @@ static void probe_workqueue_destruction(struct task_struct *wq_thread)
pr_debug("trace_workqueue: don't find workqueue to destroy\n");
found:
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
}
@@ -141,13 +143,13 @@ static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
struct cpu_workqueue_stats *ret = NULL;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
- if (!list_empty(&all_workqueue_stat[cpu].list))
- ret = list_entry(all_workqueue_stat[cpu].list.next,
+ if (!list_empty(&workqueue_cpu_stat(cpu)->list))
+ ret = list_entry(workqueue_cpu_stat(cpu)->list.next,
struct cpu_workqueue_stats, list);
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
return ret;
}
@@ -172,9 +174,9 @@ static void *workqueue_stat_next(void *prev, int idx)
unsigned long flags;
void *ret = NULL;
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- if (list_is_last(&prev_cws->list, &all_workqueue_stat[cpu].list)) {
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (list_is_last(&prev_cws->list, &workqueue_cpu_stat(cpu)->list)) {
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
for (++cpu ; cpu < num_possible_cpus(); cpu++) {
ret = workqueue_stat_start_cpu(cpu);
if (ret)
@@ -182,7 +184,7 @@ static void *workqueue_stat_next(void *prev, int idx)
}
return NULL;
}
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
return list_entry(prev_cws->list.next, struct cpu_workqueue_stats,
list);
@@ -199,10 +201,10 @@ static int workqueue_stat_show(struct seq_file *s, void *p)
cws->executed,
trace_find_cmdline(cws->pid));
- spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
- if (&cws->list == all_workqueue_stat[cpu].list.next)
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
seq_printf(s, "\n");
- spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
return 0;
}
@@ -258,17 +260,9 @@ int __init trace_workqueue_early_init(void)
if (ret)
goto no_creation;
- all_workqueue_stat = kmalloc(sizeof(struct workqueue_global_stats)
- * num_possible_cpus(), GFP_KERNEL);
-
- if (!all_workqueue_stat) {
- pr_warning("trace_workqueue: not enough memory\n");
- goto no_creation;
- }
-
for_each_possible_cpu(cpu) {
- spin_lock_init(&all_workqueue_stat[cpu].lock);
- INIT_LIST_HEAD(&all_workqueue_stat[cpu].list);
+ spin_lock_init(&workqueue_cpu_stat(cpu)->lock);
+ INIT_LIST_HEAD(&workqueue_cpu_stat(cpu)->list);
}
return 0;
--
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