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Message-ID: <20210412102001.353833279@infradead.org>
Date: Mon, 12 Apr 2021 12:14:26 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: mingo@...nel.org, mgorman@...e.de, juri.lelli@...hat.com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
rostedt@...dmis.org, bsegall@...gle.com, bristot@...hat.com,
joshdon@...gle.com, valentin.schneider@....com
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, greg@...ah.com,
linux@...musvillemoes.dk
Subject: [PATCH v2 5/9] sched,preempt: Move preempt_dynamic to debug.c
Move the #ifdef SCHED_DEBUG bits to kernel/sched/debug.c in order to
collect all the debugfs bits.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
kernel/sched/core.c | 77 +--------------------------------------------------
kernel/sched/debug.c | 67 +++++++++++++++++++++++++++++++++++++++++++-
kernel/sched/sched.h | 11 +++++--
3 files changed, 78 insertions(+), 77 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5371,9 +5371,9 @@ enum {
preempt_dynamic_full,
};
-static int preempt_dynamic_mode = preempt_dynamic_full;
+int preempt_dynamic_mode = preempt_dynamic_full;
-static int sched_dynamic_mode(const char *str)
+int sched_dynamic_mode(const char *str)
{
if (!strcmp(str, "none"))
return preempt_dynamic_none;
@@ -5387,7 +5387,7 @@ static int sched_dynamic_mode(const char
return -EINVAL;
}
-static void sched_dynamic_update(int mode)
+void sched_dynamic_update(int mode)
{
/*
* Avoid {NONE,VOLUNTARY} -> FULL transitions from ever ending up in
@@ -5444,79 +5444,8 @@ static int __init setup_preempt_mode(cha
}
__setup("preempt=", setup_preempt_mode);
-#ifdef CONFIG_SCHED_DEBUG
-
-static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
- size_t cnt, loff_t *ppos)
-{
- char buf[16];
- int mode;
-
- if (cnt > 15)
- cnt = 15;
-
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
-
- buf[cnt] = 0;
- mode = sched_dynamic_mode(strstrip(buf));
- if (mode < 0)
- return mode;
-
- sched_dynamic_update(mode);
-
- *ppos += cnt;
-
- return cnt;
-}
-
-static int sched_dynamic_show(struct seq_file *m, void *v)
-{
- static const char * preempt_modes[] = {
- "none", "voluntary", "full"
- };
- int i;
-
- for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
- if (preempt_dynamic_mode == i)
- seq_puts(m, "(");
- seq_puts(m, preempt_modes[i]);
- if (preempt_dynamic_mode == i)
- seq_puts(m, ")");
-
- seq_puts(m, " ");
- }
-
- seq_puts(m, "\n");
- return 0;
-}
-
-static int sched_dynamic_open(struct inode *inode, struct file *filp)
-{
- return single_open(filp, sched_dynamic_show, NULL);
-}
-
-static const struct file_operations sched_dynamic_fops = {
- .open = sched_dynamic_open,
- .write = sched_dynamic_write,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-extern struct dentry *debugfs_sched;
-
-static __init int sched_init_debug_dynamic(void)
-{
- debugfs_create_file("sched_preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
- return 0;
-}
-late_initcall(sched_init_debug_dynamic);
-
-#endif /* CONFIG_SCHED_DEBUG */
#endif /* CONFIG_PREEMPT_DYNAMIC */
-
/*
* This is the entry point to schedule() from kernel preemption
* off of irq context.
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -215,9 +215,71 @@ static const struct file_operations sche
#endif /* SMP */
+#ifdef CONFIG_PREEMPT_DYNAMIC
+
+static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[16];
+ int mode;
+
+ if (cnt > 15)
+ cnt = 15;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+ mode = sched_dynamic_mode(strstrip(buf));
+ if (mode < 0)
+ return mode;
+
+ sched_dynamic_update(mode);
+
+ *ppos += cnt;
+
+ return cnt;
+}
+
+static int sched_dynamic_show(struct seq_file *m, void *v)
+{
+ static const char * preempt_modes[] = {
+ "none", "voluntary", "full"
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
+ if (preempt_dynamic_mode == i)
+ seq_puts(m, "(");
+ seq_puts(m, preempt_modes[i]);
+ if (preempt_dynamic_mode == i)
+ seq_puts(m, ")");
+
+ seq_puts(m, " ");
+ }
+
+ seq_puts(m, "\n");
+ return 0;
+}
+
+static int sched_dynamic_open(struct inode *inode, struct file *filp)
+{
+ return single_open(filp, sched_dynamic_show, NULL);
+}
+
+static const struct file_operations sched_dynamic_fops = {
+ .open = sched_dynamic_open,
+ .write = sched_dynamic_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#endif /* CONFIG_PREEMPT_DYNAMIC */
+
__read_mostly bool sched_debug_enabled;
-struct dentry *debugfs_sched;
+static struct dentry *debugfs_sched;
static __init int sched_init_debug(void)
{
@@ -227,6 +289,9 @@ static __init int sched_init_debug(void)
debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
debugfs_create_bool("debug_enabled", 0644, debugfs_sched, &sched_debug_enabled);
+#ifdef CONFIG_PREEMPT_DYNAMIC
+ debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
+#endif
debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency);
debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity);
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2733,5 +2733,12 @@ static inline bool is_per_cpu_kthread(st
}
#endif
-void swake_up_all_locked(struct swait_queue_head *q);
-void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
+extern void swake_up_all_locked(struct swait_queue_head *q);
+extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
+
+#ifdef CONFIG_PREEMPT_DYNAMIC
+extern int preempt_dynamic_mode;
+extern int sched_dynamic_mode(const char *str);
+extern void sched_dynamic_update(int mode);
+#endif
+
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