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Subject[patch 11/12] Scheduler Profiling - Use Immediate Values
Use immediate values with lower d-cache hit in optimized version as a
condition for scheduler profiling call.

Changelog :
- Use imv_* instead of immediate_*.
- Follow the white rabbit : kvm_main.c which becomes x86.c.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Adrian Bunk <bunk@stusta.de>
CC: Andi Kleen <andi@firstfloor.org>
CC: Christoph Hellwig <hch@infradead.org>
CC: mingo@elte.hu
CC: akpm@osdl.org
---
arch/x86/kvm/x86.c | 2 +-
include/linux/profile.h | 5 +++--
kernel/ksysfs.c | 4 ++--
kernel/profile.c | 22 +++++++++++-----------
kernel/sched_fair.c | 7 ++-----
5 files changed, 19 insertions(+), 21 deletions(-)
Index: linux.trees.git/kernel/profile.c
===================================================================
--- linux.trees.git.orig/kernel/profile.c 2009-09-24 08:52:55.000000000 -0400
+++ linux.trees.git/kernel/profile.c 2009-09-24 09:03:02.000000000 -0400
@@ -42,8 +42,8 @@ static int (*timer_hook)(struct pt_regs
static atomic_t *prof_buffer;
static unsigned long prof_len, prof_shift;

-int prof_on __read_mostly;
-EXPORT_SYMBOL_GPL(prof_on);
+DEFINE_IMV(char, prof_on) __read_mostly;
+EXPORT_IMV_SYMBOL_GPL(prof_on);

static cpumask_var_t prof_cpu_mask;
#ifdef CONFIG_SMP
@@ -61,7 +61,7 @@ int profile_setup(char *str)

if (!strncmp(str, sleepstr, strlen(sleepstr))) {
#ifdef CONFIG_SCHEDSTATS
- prof_on = SLEEP_PROFILING;
+ imv_set(prof_on, SLEEP_PROFILING);
if (str[strlen(sleepstr)] == ',')
str += strlen(sleepstr) + 1;
if (get_option(&str, &par))
@@ -74,7 +74,7 @@ int profile_setup(char *str)
"kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
#endif /* CONFIG_SCHEDSTATS */
} else if (!strncmp(str, schedstr, strlen(schedstr))) {
- prof_on = SCHED_PROFILING;
+ imv_set(prof_on, SCHED_PROFILING);
if (str[strlen(schedstr)] == ',')
str += strlen(schedstr) + 1;
if (get_option(&str, &par))
@@ -83,7 +83,7 @@ int profile_setup(char *str)
"kernel schedule profiling enabled (shift: %ld)\n",
prof_shift);
} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
- prof_on = KVM_PROFILING;
+ imv_set(prof_on, KVM_PROFILING);
if (str[strlen(kvmstr)] == ',')
str += strlen(kvmstr) + 1;
if (get_option(&str, &par))
@@ -93,7 +93,7 @@ int profile_setup(char *str)
prof_shift);
} else if (get_option(&str, &par)) {
prof_shift = par;
- prof_on = CPU_PROFILING;
+ imv_set(prof_on, CPU_PROFILING);
printk(KERN_INFO "kernel profiling enabled (shift: %ld)\n",
prof_shift);
}
@@ -105,7 +105,7 @@ __setup("profile=", profile_setup);
int __ref profile_init(void)
{
int buffer_bytes;
- if (!prof_on)
+ if (!_imv_read(prof_on))
return 0;

/* only text is profiled */
@@ -309,7 +309,7 @@ void profile_hits(int type, void *__pc,
int i, j, cpu;
struct profile_hit *hits;

- if (prof_on != type || !prof_buffer)
+ if (!prof_buffer)
return;
pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
@@ -421,7 +421,7 @@ void profile_hits(int type, void *__pc,
{
unsigned long pc;

- if (prof_on != type || !prof_buffer)
+ if (!prof_buffer)
return;
pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]);
@@ -585,7 +585,7 @@ static int create_hash_tables(void)
}
return 0;
out_cleanup:
- prof_on = 0;
+ imv_set(prof_on, 0);
smp_mb();
on_each_cpu(profile_nop, NULL, 1);
for_each_online_cpu(cpu) {
@@ -612,7 +612,7 @@ int __ref create_proc_profile(void) /* f
{
struct proc_dir_entry *entry;

- if (!prof_on)
+ if (!_imv_read(prof_on))
return 0;
if (create_hash_tables())
return -ENOMEM;
Index: linux.trees.git/include/linux/profile.h
===================================================================
--- linux.trees.git.orig/include/linux/profile.h 2008-10-30 20:22:52.000000000 -0400
+++ linux.trees.git/include/linux/profile.h 2009-09-24 09:03:02.000000000 -0400
@@ -5,6 +5,7 @@
#include <linux/init.h>
#include <linux/cpumask.h>
#include <linux/cache.h>
+#include <linux/immediate.h>

#include <asm/errno.h>

@@ -38,7 +39,7 @@ enum profile_type {

#ifdef CONFIG_PROFILING

-extern int prof_on __read_mostly;
+DECLARE_IMV(char, prof_on) __read_mostly;

/* init basic kernel profiler */
int profile_init(void);
@@ -58,7 +59,7 @@ static inline void profile_hit(int type,
/*
* Speedup for the common (no profiling enabled) case:
*/
- if (unlikely(prof_on == type))
+ if (unlikely(imv_read(prof_on) == type))
profile_hits(type, ip, 1);
}

Index: linux.trees.git/kernel/sched_fair.c
===================================================================
--- linux.trees.git.orig/kernel/sched_fair.c 2009-09-24 08:52:55.000000000 -0400
+++ linux.trees.git/kernel/sched_fair.c 2009-09-24 09:03:56.000000000 -0400
@@ -672,11 +672,8 @@ static void enqueue_sleeper(struct cfs_r
* 20 to get a milliseconds-range estimation of the
* amount of time that the task spent sleeping:
*/
- if (unlikely(prof_on == SLEEP_PROFILING)) {
- profile_hits(SLEEP_PROFILING,
- (void *)get_wchan(tsk),
- delta >> 20);
- }
+ profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk),
+ delta >> 20);
account_scheduler_latency(tsk, delta >> 10, 0);
}
}
Index: linux.trees.git/arch/x86/kvm/x86.c
===================================================================
--- linux.trees.git.orig/arch/x86/kvm/x86.c 2009-09-24 08:52:42.000000000 -0400
+++ linux.trees.git/arch/x86/kvm/x86.c 2009-09-24 09:03:02.000000000 -0400
@@ -3672,7 +3672,7 @@ static int vcpu_enter_guest(struct kvm_v
/*
* Profile KVM exit RIPs:
*/
- if (unlikely(prof_on == KVM_PROFILING)) {
+ if (unlikely(imv_read(prof_on) == KVM_PROFILING)) {
unsigned long rip = kvm_rip_read(vcpu);
profile_hit(KVM_PROFILING, (void *)rip);
}
Index: linux.trees.git/kernel/ksysfs.c
===================================================================
--- linux.trees.git.orig/kernel/ksysfs.c 2009-03-06 13:29:01.000000000 -0500
+++ linux.trees.git/kernel/ksysfs.c 2009-09-24 09:03:02.000000000 -0400
@@ -58,7 +58,7 @@ KERNEL_ATTR_RW(uevent_helper);
static ssize_t profiling_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", prof_on);
+ return sprintf(buf, "%d\n", _imv_read(prof_on));
}
static ssize_t profiling_store(struct kobject *kobj,
struct kobj_attribute *attr,
@@ -66,7 +66,7 @@ static ssize_t profiling_store(struct ko
{
int ret;

- if (prof_on)
+ if (_imv_read(prof_on))
return -EEXIST;
/*
* This eventually calls into get_option() which
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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