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powerpc/cell: Use system_wq in cpufreq_spudemand

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With cmwq, there's no reason to use a separate workqueue in
cpufreq_spudemand.  Use system_wq instead.  The work items are already
sync canceled on stop, so it's already guaranteed that no work is
running when spu_gov_exit() is entered.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Dave Jones <davej@redhat.com>
Cc: cpufreq@vger.kernel.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Tejun Heo 2011-01-03 03:49:25 +00:00 committed by Benjamin Herrenschmidt
parent f32be0c540
commit b18ae08dea
2 changed files with 23 additions and 22 deletions
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25
arch/powerpc/kernel/time.c
View file

@ -265,11 +265,26 @@ void accumulate_stolen_time(void)
{
u64 sst, ust;
sst = scan_dispatch_log(get_paca()->starttime_user);
ust = scan_dispatch_log(get_paca()->starttime);
get_paca()->system_time -= sst;
get_paca()->user_time -= ust;
get_paca()->stolen_time += ust + sst;
u8 save_soft_enabled = local_paca->soft_enabled;
u8 save_hard_enabled = local_paca->hard_enabled;
/* We are called early in the exception entry, before
* soft/hard_enabled are sync'ed to the expected state
* for the exception. We are hard disabled but the PACA
* needs to reflect that so various debug stuff doesn't
* complain
*/
local_paca->soft_enabled = 0;
local_paca->hard_enabled = 0;
sst = scan_dispatch_log(local_paca->starttime_user);
ust = scan_dispatch_log(local_paca->starttime);
local_paca->system_time -= sst;
local_paca->user_time -= ust;
local_paca->stolen_time += ust + sst;
local_paca->soft_enabled = save_soft_enabled;
local_paca->hard_enabled = save_hard_enabled;
}
static inline u64 calculate_stolen_time(u64 stop_tb)

20
arch/powerpc/platforms/cell/cpufreq_spudemand.c
View file

@ -39,8 +39,6 @@ struct spu_gov_info_struct {
};
static DEFINE_PER_CPU(struct spu_gov_info_struct, spu_gov_info);
static struct workqueue_struct *kspugov_wq;
static int calc_freq(struct spu_gov_info_struct *info)
{
int cpu;
@ -71,14 +69,14 @@ static void spu_gov_work(struct work_struct *work)
__cpufreq_driver_target(info->policy, target_freq, CPUFREQ_RELATION_H);
delay = usecs_to_jiffies(info->poll_int);
queue_delayed_work_on(info->policy->cpu, kspugov_wq, &info->work, delay);
schedule_delayed_work_on(info->policy->cpu, &info->work, delay);
}
static void spu_gov_init_work(struct spu_gov_info_struct *info)
{
int delay = usecs_to_jiffies(info->poll_int);
INIT_DELAYED_WORK_DEFERRABLE(&info->work, spu_gov_work);
queue_delayed_work_on(info->policy->cpu, kspugov_wq, &info->work, delay);
schedule_delayed_work_on(info->policy->cpu, &info->work, delay);
}
static void spu_gov_cancel_work(struct spu_gov_info_struct *info)
@ -152,27 +150,15 @@ static int __init spu_gov_init(void)
{
int ret;
kspugov_wq = create_workqueue("kspugov");
if (!kspugov_wq) {
printk(KERN_ERR "creation of kspugov failed\n");
ret = -EFAULT;
goto out;
}
ret = cpufreq_register_governor(&spu_governor);
if (ret) {
if (ret)
printk(KERN_ERR "registration of governor failed\n");
destroy_workqueue(kspugov_wq);
goto out;
}
out:
return ret;
}
static void __exit spu_gov_exit(void)
{
cpufreq_unregister_governor(&spu_governor);
destroy_workqueue(kspugov_wq);
}