Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1452914
| From | "Rafael J. Wysocki" <rjw@rjwysocki.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition |
| Date | 2016-08-01 01:50 +0200 |
| Message-ID | <s18Ex-6NS-17@gated-at.bofh.it> (permalink) |
| References | <s18Ex-6NS-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Testing indicates that it is possible to improve performace
significantly without increasing energy consumption too much by
teaching cpufreq governors to bump up the CPU performance level if
the in_iowait flag is set for the task in enqueue_task_fair().
For this purpose, define a new cpufreq_update_util() flag
UUF_IO and modify enqueue_task_fair() to pass that flag to
cpufreq_update_util() in the in_iowait case. That generally
requires cpufreq_update_util() to be called directly from there,
because update_load_avg() is not likely to be invoked in that
case.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
include/linux/sched.h | 1 +
kernel/sched/fair.c | 8 ++++++++
2 files changed, 9 insertions(+)
Index: linux-pm/kernel/sched/fair.c
===================================================================
--- linux-pm.orig/kernel/sched/fair.c
+++ linux-pm/kernel/sched/fair.c
@@ -4459,6 +4459,14 @@ enqueue_task_fair(struct rq *rq, struct
struct cfs_rq *cfs_rq;
struct sched_entity *se = &p->se;
+ /*
+ * If in_iowait is set, it is likely that the loops below will not
+ * trigger any cpufreq utilization updates, so do it here explicitly
+ * with the IO flag passed.
+ */
+ if (p->in_iowait)
+ cpufreq_update_util(rq, UUF_IO);
+
for_each_sched_entity(se) {
if (se->on_rq)
break;
Index: linux-pm/include/linux/sched.h
===================================================================
--- linux-pm.orig/include/linux/sched.h
+++ linux-pm/include/linux/sched.h
@@ -3376,6 +3376,7 @@ static inline unsigned long rlimit_max(u
}
#define UUF_RT 0x01
+#define UUF_IO 0x02
#ifdef CONFIG_CPU_FREQ
struct update_util_data {
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
[RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() Dominik Brodowski <linux@dominikbrodowski.net> - 2016-08-01 10:00 +0200
Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 17:10 +0200
Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 22:30 +0200
Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 01:50 +0200
Re: [RFC][PATCH 4/7] cpufreq / sched: Add flags argument to cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 04:10 +0200
[RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() Dominik Brodowski <linux@dominikbrodowski.net> - 2016-08-01 10:00 +0200
Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 17:10 +0200
Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 21:50 +0200
Re: [RFC][PATCH 3/7] cpufreq / sched: Check cpu_of(rq) in cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 01:50 +0200
[RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly Steve Muckle <steve.muckle@linaro.org> - 2016-08-01 21:40 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-02 02:10 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly Juri Lelli <juri.lelli@arm.com> - 2016-08-02 12:40 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 16:40 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly Juri Lelli <juri.lelli@arm.com> - 2016-08-02 17:00 +0200
Re: [RFC][PATCH 1/7] cpufreq / sched: Make schedutil access utilization data directly Peter Zijlstra <peterz@infradead.org> - 2016-08-08 12:40 +0200
[RFC][PATCH 2/7] cpufreq / sched: Drop cpufreq_trigger_update() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
[RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 03:30 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rafael@kernel.org> - 2016-08-02 03:50 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-03 00:30 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rafael@kernel.org> - 2016-08-03 00:50 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-04 04:30 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-04 23:20 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition Steve Muckle <steve.muckle@linaro.org> - 2016-08-05 00:10 +0200
Re: [RFC][PATCH 5/7] cpufreq / sched: UUF_IO flag to indicate iowait condition "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-06 23:20 +0200
[RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
RE: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Doug Smythies" <dsmythies@telus.net> - 2016-08-04 09:00 +0200
Re: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-06 23:50 +0200
RE: [RFC][PATCH 7/7] cpufreq: intel_pstate: Change P-state selection algorithm for Core "Doug Smythies" <dsmythies@telus.net> - 2016-08-09 19:20 +0200
[RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 01:50 +0200
Re: [RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting Steve Muckle <steve.muckle@linaro.org> - 2016-08-02 03:40 +0200
Re: [RFC][PATCH 6/7] cpufreq: schedutil: Add iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-03 01:00 +0200
RE: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Doug Smythies" <dsmythies@telus.net> - 2016-08-01 17:30 +0200
Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-01 18:30 +0200
Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting Peter Zijlstra <peterz@infradead.org> - 2016-08-08 13:10 +0200
Re: [RFC][PATCH 0/7] cpufreq / sched: cpufreq_update_util() flags and iowait boosting "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-08-08 15:00 +0200
csiph-web