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Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: Fix out of scope variable access in sched_slice()
  sched: Hide runqueues from direct refer at source code level
  sched: Remove unneeded __ref tag
  sched, x86: Fix cpufreq + sched_clock() TSC scaling
This commit is contained in:
Linus Torvalds 2009-06-20 10:57:40 -07:00
parent b0b7065b64 3104bf03a9
commit 1eb51c33b2
6 changed files with 18 additions and 9 deletions
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6
arch/x86/include/asm/timer.h
View File

@ -45,12 +45,16 @@ extern int no_timer_check;
*/
DECLARE_PER_CPU(unsigned long, cyc2ns);
DECLARE_PER_CPU(unsigned long long, cyc2ns_offset);
#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
static inline unsigned long long __cycles_2_ns(unsigned long long cyc)
{
return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR;
int cpu = smp_processor_id();
unsigned long long ns = per_cpu(cyc2ns_offset, cpu);
ns += cyc * per_cpu(cyc2ns, cpu) >> CYC2NS_SCALE_FACTOR;
return ns;
}
static inline unsigned long long cycles_2_ns(unsigned long long cyc)

8
arch/x86/kernel/tsc.c
View File

@ -590,22 +590,26 @@ EXPORT_SYMBOL(recalibrate_cpu_khz);
*/
DEFINE_PER_CPU(unsigned long, cyc2ns);
DEFINE_PER_CPU(unsigned long long, cyc2ns_offset);
static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
{
unsigned long long tsc_now, ns_now;
unsigned long long tsc_now, ns_now, *offset;
unsigned long flags, *scale;
local_irq_save(flags);
sched_clock_idle_sleep_event();
scale = &per_cpu(cyc2ns, cpu);
offset = &per_cpu(cyc2ns_offset, cpu);
rdtscll(tsc_now);
ns_now = __cycles_2_ns(tsc_now);
if (cpu_khz)
if (cpu_khz) {
*scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
*offset = ns_now - (tsc_now * *scale >> CYC2NS_SCALE_FACTOR);
}
sched_clock_idle_wakeup_event(0);
local_irq_restore(flags);

2
kernel/sched.c
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@ -7822,7 +7822,7 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
free_rootdomain(old_rd);
}
static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
static int init_rootdomain(struct root_domain *rd, bool bootmem)
{
gfp_t gfp = GFP_KERNEL;

2
kernel/sched_cpupri.c
View File

@ -152,7 +152,7 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri)
*
* Returns: -ENOMEM if memory fails.
*/
int __init_refok cpupri_init(struct cpupri *cp, bool bootmem)
int cpupri_init(struct cpupri *cp, bool bootmem)
{
gfp_t gfp = GFP_KERNEL;
int i;

6
kernel/sched_debug.c
View File

@ -162,7 +162,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
{
s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
spread, rq0_min_vruntime, spread0;
struct rq *rq = &per_cpu(runqueues, cpu);
struct rq *rq = cpu_rq(cpu);
struct sched_entity *last;
unsigned long flags;
@ -191,7 +191,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
if (last)
max_vruntime = last->vruntime;
min_vruntime = cfs_rq->min_vruntime;
rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
spin_unlock_irqrestore(&rq->lock, flags);
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
SPLIT_NS(MIN_vruntime));
@ -248,7 +248,7 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
static void print_cpu(struct seq_file *m, int cpu)
{
struct rq *rq = &per_cpu(runqueues, cpu);
struct rq *rq = cpu_rq(cpu);
#ifdef CONFIG_X86
{

3
kernel/sched_fair.c
View File

@ -430,12 +430,13 @@ static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
for_each_sched_entity(se) {
struct load_weight *load;
struct load_weight lw;
cfs_rq = cfs_rq_of(se);
load = &cfs_rq->load;
if (unlikely(!se->on_rq)) {
struct load_weight lw = cfs_rq->load;
lw = cfs_rq->load;
update_load_add(&lw, se->load.weight);
load = &lw;