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Message-Id: <db775d65b18ddac4a75faad6761c6c2abf3efb78.1693510979.git.bristot@kernel.org>
Date: Thu, 31 Aug 2023 22:28:58 +0200
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
linux-kernel@...r.kernel.org,
Luca Abeni <luca.abeni@...tannapisa.it>,
Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
Thomas Gleixner <tglx@...utronix.de>,
Joel Fernandes <joel@...lfernandes.org>,
Vineeth Pillai <vineeth@...byteword.org>,
Shuah Khan <skhan@...uxfoundation.org>, bristot@...nel.org,
Phil Auld <pauld@...hat.com>
Subject: [PATCH v4 7/7] sched/fair: Fair server interface
Add an interface for fair server setup on debugfs.
Each rq have three file under /sys/kernel/debug/sched/rq/CPU{ID}:
- fair_server_runtime: set runtime in ns
- fair_server_period: set period in ns
- fair_server_defer: on/off for the defer mechanism
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
kernel/sched/debug.c | 177 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 177 insertions(+)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 4c3d0d9f3db6..dad7d5d073ef 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -333,8 +333,183 @@ static const struct file_operations sched_debug_fops = {
.release = seq_release,
};
+static ssize_t
+sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ long cpu = (long) ((struct seq_file *) filp->private_data)->private;
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long flags;
+ u64 runtime;
+ int err;
+
+ err = kstrtoull_from_user(ubuf, cnt, 10, &runtime);
+ if (err)
+ return err;
+
+ raw_spin_rq_lock_irqsave(rq, flags);
+ if (runtime > rq->fair_server.dl_period)
+ err = -EINVAL;
+ else
+ rq->fair_server.dl_runtime = runtime;
+ raw_spin_rq_unlock_irqrestore(rq, flags);
+
+ if (err)
+ return err;
+
+ *ppos += cnt;
+ return cnt;
+}
+
+static int sched_fair_server_runtime_show(struct seq_file *m, void *v)
+{
+ unsigned long cpu = (unsigned long) m->private;
+ struct rq *rq = cpu_rq(cpu);
+
+ seq_printf(m, "%llu\n", rq->fair_server.dl_runtime);
+ return 0;
+}
+
+static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, sched_fair_server_runtime_show, inode->i_private);
+}
+
+static const struct file_operations fair_server_runtime_fops = {
+ .open = sched_fair_server_runtime_open,
+ .write = sched_fair_server_runtime_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static unsigned int fair_server_period_max = (1 << 22) * NSEC_PER_USEC; /* ~4 seconds */
+static unsigned int fair_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */
+
+static ssize_t
+sched_fair_server_period_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ long cpu = (long) ((struct seq_file *) filp->private_data)->private;
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long flags;
+ u64 period;
+ int err;
+
+ err = kstrtoull_from_user(ubuf, cnt, 10, &period);
+ if (err)
+ return err;
+
+ if (period < fair_server_period_min || period > fair_server_period_max)
+ return -EINVAL;
+
+ raw_spin_rq_lock_irqsave(rq, flags);
+ if (period < rq->fair_server.dl_runtime)
+ err = -EINVAL;
+ else
+ rq->fair_server.dl_period = period;
+ raw_spin_rq_unlock_irqrestore(rq, flags);
+
+ if (err)
+ return err;
+
+ *ppos += cnt;
+ return cnt;
+}
+
+static int sched_fair_server_period_show(struct seq_file *m, void *v)
+{
+ unsigned long cpu = (unsigned long) m->private;
+ struct rq *rq = cpu_rq(cpu);
+
+ seq_printf(m, "%llu\n", rq->fair_server.dl_period);
+ return 0;
+}
+
+static int sched_fair_server_period_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, sched_fair_server_period_show, inode->i_private);
+}
+
+static const struct file_operations fair_server_period_fops = {
+ .open = sched_fair_server_period_open,
+ .write = sched_fair_server_period_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static ssize_t
+sched_fair_server_defer_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ long cpu = (long) ((struct seq_file *) filp->private_data)->private;
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long flags;
+ u64 defer;
+ int err;
+
+ err = kstrtoull_from_user(ubuf, cnt, 10, &defer);
+ if (err)
+ return err;
+
+ if (defer < 0 || defer > 1)
+ return -EINVAL;
+
+ raw_spin_rq_lock_irqsave(rq, flags);
+ rq->fair_server_defer = defer;
+ raw_spin_rq_unlock_irqrestore(rq, flags);
+
+ *ppos += cnt;
+ return cnt;
+}
+
+static int sched_fair_server_defer_show(struct seq_file *m, void *v)
+{
+ unsigned long cpu = (unsigned long) m->private;
+ struct rq *rq = cpu_rq(cpu);
+
+ seq_printf(m, "%d\n", rq->fair_server_defer);
+ return 0;
+}
+
+static int sched_fair_server_defer_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, sched_fair_server_defer_show, inode->i_private);
+}
+
+static const struct file_operations fair_server_defer_fops = {
+ .open = sched_fair_server_defer_open,
+ .write = sched_fair_server_defer_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static struct dentry *debugfs_sched;
+void debugfs_fair_server_init(void)
+{
+ long cpu;
+ struct dentry *rq_dentry;
+
+ rq_dentry = debugfs_create_dir("rq", debugfs_sched);
+ if (!rq_dentry)
+ return;
+
+ for_each_possible_cpu(cpu) {
+ struct dentry *d_cpu;
+ char buf[32];
+
+ snprintf(buf, sizeof(buf), "cpu%ld", cpu);
+ d_cpu = debugfs_create_dir(buf, rq_dentry);
+
+ debugfs_create_file("fair_server_runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops);
+ debugfs_create_file("fair_server_period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops);
+ debugfs_create_file("fair_server_defer", 0644, d_cpu, (void *) cpu, &fair_server_defer_fops);
+ }
+}
+
static __init int sched_init_debug(void)
{
struct dentry __maybe_unused *numa;
@@ -374,6 +549,8 @@ static __init int sched_init_debug(void)
debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
+ debugfs_fair_server_init();
+
return 0;
}
late_initcall(sched_init_debug);
--
2.40.1
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