From: Alex Shi <alex.shi@intel.com>
To: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de,
akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de,
pjt@google.com, namhyung@kernel.org, efault@gmx.de,
morten.rasmussen@arm.com
Cc: vincent.guittot@linaro.org, gregkh@linuxfoundation.org,
preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org,
linux-kernel@vger.kernel.org, alex.shi@intel.com,
len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz,
clark.williams@gmail.com, tony.luck@intel.com,
keescook@chromium.org, mgorman@suse.de, riel@redhat.com
Subject: [patch v7 04/21] sched: add sysfs interface for sched_balance_policy selection
Date: Thu, 4 Apr 2013 10:00:45 +0800 [thread overview]
Message-ID: <1365040862-8390-5-git-send-email-alex.shi@intel.com> (raw)
In-Reply-To: <1365040862-8390-1-git-send-email-alex.shi@intel.com>
This patch add the power aware scheduler knob into sysfs:
$cat /sys/devices/system/cpu/sched_balance_policy/available_sched_balance_policy
performance powersaving
$cat /sys/devices/system/cpu/sched_balance_policy/current_sched_balance_policy
powersaving
This means the using sched balance policy is 'powersaving'.
User can change the policy by commend 'echo':
echo performance > /sys/devices/system/cpu/sched_balance_policy/current_sched_balance_policy
Signed-off-by: Alex Shi <alex.shi@intel.com>
---
Documentation/ABI/testing/sysfs-devices-system-cpu | 22 +++++++
kernel/sched/fair.c | 69 ++++++++++++++++++++++
2 files changed, 91 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 9c978dc..b602882 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -53,6 +53,28 @@ Description: Dynamic addition and removal of CPU's. This is not hotplug
the system. Information writtento the file to remove CPU's
is architecture specific.
+What: /sys/devices/system/cpu/sched_balance_policy/current_sched_balance_policy
+ /sys/devices/system/cpu/sched_balance_policy/available_sched_balance_policy
+Date: Oct 2012
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: CFS balance policy show and set interface.
+
+ available_sched_balance_policy: shows there are 2 kinds of
+ policies:
+ performance powersaving.
+ current_sched_balance_policy: shows current scheduler policy.
+ User can change the policy by writing it.
+
+ Policy decides the CFS scheduler how to balance tasks onto
+ different CPU unit.
+
+ performance: try to spread tasks onto more CPU sockets,
+ more CPU cores. performance oriented.
+
+ powersaving: try to pack tasks onto same core or same CPU
+ until every LCPUs are busy in the core or CPU socket.
+ powersaving oriented.
+
What: /sys/devices/system/cpu/cpu#/node
Date: October 2009
Contact: Linux memory management mailing list <linux-mm@kvack.org>
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 04dd319..2e49c3f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6096,6 +6096,75 @@ static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task
/* The default scheduler policy is 'performance'. */
int __read_mostly sched_balance_policy = SCHED_POLICY_PERFORMANCE;
+#ifdef CONFIG_SYSFS
+static ssize_t show_available_sched_balance_policy(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "performance powersaving\n");
+}
+
+static ssize_t show_current_sched_balance_policy(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (sched_balance_policy == SCHED_POLICY_PERFORMANCE)
+ return sprintf(buf, "performance\n");
+ else if (sched_balance_policy == SCHED_POLICY_POWERSAVING)
+ return sprintf(buf, "powersaving\n");
+ return 0;
+}
+
+static ssize_t set_sched_balance_policy(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ unsigned int ret = -EINVAL;
+ char str_policy[16];
+
+ ret = sscanf(buf, "%15s", str_policy);
+ if (ret != 1)
+ return -EINVAL;
+
+ if (!strcmp(str_policy, "performance"))
+ sched_balance_policy = SCHED_POLICY_PERFORMANCE;
+ else if (!strcmp(str_policy, "powersaving"))
+ sched_balance_policy = SCHED_POLICY_POWERSAVING;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+/*
+ * * Sysfs setup bits:
+ * */
+static DEVICE_ATTR(current_sched_balance_policy, 0644,
+ show_current_sched_balance_policy, set_sched_balance_policy);
+
+static DEVICE_ATTR(available_sched_balance_policy, 0444,
+ show_available_sched_balance_policy, NULL);
+
+static struct attribute *sched_balance_policy_default_attrs[] = {
+ &dev_attr_current_sched_balance_policy.attr,
+ &dev_attr_available_sched_balance_policy.attr,
+ NULL
+};
+static struct attribute_group sched_balance_policy_attr_group = {
+ .attrs = sched_balance_policy_default_attrs,
+ .name = "sched_balance_policy",
+};
+
+int __init create_sysfs_sched_balance_policy_group(struct device *dev)
+{
+ return sysfs_create_group(&dev->kobj, &sched_balance_policy_attr_group);
+}
+
+static int __init sched_balance_policy_sysfs_init(void)
+{
+ return create_sysfs_sched_balance_policy_group(cpu_subsys.dev_root);
+}
+
+core_initcall(sched_balance_policy_sysfs_init);
+#endif /* CONFIG_SYSFS */
+
/*
* All the scheduling class methods:
*/
--
1.7.12
next prev parent reply other threads:[~2013-04-04 2:01 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 2:00 [patch v7 0/21] sched: power aware scheduling Alex Shi
2013-04-04 2:00 ` [patch v7 01/21] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" Alex Shi
2013-04-04 2:00 ` [patch v7 02/21] sched: set initial value of runnable avg for new forked task Alex Shi
2013-05-06 3:24 ` Preeti U Murthy
2013-04-04 2:00 ` [patch v7 03/21] sched: add sched balance policies in kernel Alex Shi
2013-04-04 2:00 ` Alex Shi [this message]
2013-04-04 2:00 ` [patch v7 05/21] sched: log the cpu utilization at rq Alex Shi
2013-05-06 3:26 ` Preeti U Murthy
2013-05-06 5:22 ` Alex Shi
2013-05-06 12:03 ` Phil Carmody
2013-05-06 12:35 ` Alex Shi
2013-05-06 21:19 ` Paul Turner
2013-04-04 2:00 ` [patch v7 06/21] sched: add new sg/sd_lb_stats fields for incoming fork/exec/wake balancing Alex Shi
2013-04-04 2:00 ` [patch v7 07/21] sched: move sg/sd_lb_stats struct ahead Alex Shi
2013-04-04 2:00 ` [patch v7 08/21] sched: scale_rt_power rename and meaning change Alex Shi
2013-04-04 2:00 ` [patch v7 09/21] sched: get rq potential maximum utilization Alex Shi
2013-04-04 2:00 ` [patch v7 10/21] sched: add power aware scheduling in fork/exec/wake Alex Shi
2013-04-04 2:00 ` [patch v7 11/21] sched: add sched_burst_threshold_ns as wakeup burst indicator Alex Shi
2013-04-04 2:00 ` [patch v7 12/21] sched: using avg_idle to detect bursty wakeup Alex Shi
2013-04-04 2:00 ` [patch v7 13/21] sched: packing transitory tasks in wakeup power balancing Alex Shi
2013-04-04 2:00 ` [patch v7 14/21] sched: add power/performance balance allow flag Alex Shi
2013-04-04 2:00 ` [patch v7 15/21] sched: pull all tasks from source group Alex Shi
2013-04-04 5:59 ` Namhyung Kim
2013-04-06 11:49 ` Alex Shi
2013-04-04 2:00 ` [patch v7 16/21] sched: no balance for prefer_sibling in power scheduling Alex Shi
2013-05-06 3:26 ` Preeti U Murthy
2013-04-04 2:00 ` [patch v7 17/21] sched: add new members of sd_lb_stats Alex Shi
2013-04-04 2:00 ` [patch v7 18/21] sched: power aware load balance Alex Shi
2013-04-04 2:01 ` [patch v7 19/21] sched: lazy power balance Alex Shi
2013-04-04 2:01 ` [patch v7 20/21] sched: don't do power balance on share cpu power domain Alex Shi
2013-04-08 3:17 ` Preeti U Murthy
2013-04-08 3:25 ` Preeti U Murthy
2013-04-08 4:19 ` Alex Shi
2013-04-04 2:01 ` [patch v7 21/21] sched: make sure select_tas_rq_fair get a cpu Alex Shi
2013-04-11 21:02 ` [patch v7 0/21] sched: power aware scheduling Len Brown
2013-04-12 8:46 ` Alex Shi
2013-04-12 16:23 ` Borislav Petkov
2013-04-12 16:48 ` Mike Galbraith
2013-04-12 17:12 ` Borislav Petkov
2013-04-14 1:36 ` Alex Shi
2013-04-17 21:53 ` Len Brown
2013-04-18 1:51 ` Mike Galbraith
2013-04-26 15:11 ` Mike Galbraith
2013-04-30 5:16 ` Mike Galbraith
2013-04-30 8:30 ` Mike Galbraith
2013-04-30 8:41 ` Ingo Molnar
2013-04-30 9:35 ` Mike Galbraith
2013-04-30 9:49 ` Mike Galbraith
2013-04-30 9:56 ` Mike Galbraith
2013-05-17 8:06 ` Preeti U Murthy
2013-05-20 1:01 ` Alex Shi
2013-05-20 2:30 ` Preeti U Murthy
2013-04-14 1:28 ` Alex Shi
2013-04-14 5:10 ` Alex Shi
2013-04-14 15:59 ` Borislav Petkov
2013-04-15 6:04 ` Alex Shi
2013-04-15 6:16 ` Alex Shi
2013-04-15 9:52 ` Borislav Petkov
2013-04-15 13:50 ` Alex Shi
2013-04-15 23:12 ` Borislav Petkov
2013-04-16 0:22 ` Alex Shi
2013-04-16 10:24 ` Borislav Petkov
2013-04-17 1:18 ` Alex Shi
2013-04-17 7:38 ` Borislav Petkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1365040862-8390-5-git-send-email-alex.shi@intel.com \
--to=alex.shi@intel.com \
--cc=akpm@linux-foundation.org \
--cc=arjan@linux.intel.com \
--cc=bp@alien8.de \
--cc=clark.williams@gmail.com \
--cc=efault@gmx.de \
--cc=gregkh@linuxfoundation.org \
--cc=jkosina@suse.cz \
--cc=keescook@chromium.org \
--cc=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=morten.rasmussen@arm.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=preeti@linux.vnet.ibm.com \
--cc=rafael.j.wysocki@intel.com \
--cc=riel@redhat.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=vincent.guittot@linaro.org \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).