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Message-Id: <20240213055554.1802415-12-ankur.a.arora@oracle.com>
Date: Mon, 12 Feb 2024 21:55:35 -0800
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de, peterz@...radead.org, torvalds@...ux-foundation.org,
paulmck@...nel.org, akpm@...ux-foundation.org, luto@...nel.org,
bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
willy@...radead.org, mgorman@...e.de, jpoimboe@...nel.org,
mark.rutland@....com, jgross@...e.com, andrew.cooper3@...rix.com,
bristot@...nel.org, mathieu.desnoyers@...icios.com,
geert@...ux-m68k.org, glaubitz@...sik.fu-berlin.de,
anton.ivanov@...bridgegreys.com, mattst88@...il.com,
krypton@...ich-teichert.org, rostedt@...dmis.org,
David.Laight@...LAB.COM, richard@....at, mjguzik@...il.com,
jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
Ankur Arora <ankur.a.arora@...cle.com>
Subject: [PATCH 11/30] sched: runtime preemption config under PREEMPT_AUTO
Reuse sched_dynamic_update() and related logic to enable choosing
the preemption model at boot or runtime for PREEMPT_AUTO.
The interface is identical to PREEMPT_DYNAMIC.
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
include/linux/sched.h | 2 +-
kernel/sched/core.c | 31 +++++++++++++++++++++++++++----
kernel/sched/debug.c | 6 +++---
kernel/sched/sched.h | 2 +-
4 files changed, 32 insertions(+), 9 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index d226c2920cff..58e6ea7572a0 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2073,7 +2073,7 @@ extern int __cond_resched_rwlock_write(rwlock_t *lock);
__cond_resched_rwlock_write(lock); \
})
-#ifdef CONFIG_PREEMPT_DYNAMIC
+#if defined(CONFIG_PREEMPT_DYNAMIC) || defined(CONFIG_PREEMPT_AUTO)
extern bool preempt_model_none(void);
extern bool preempt_model_voluntary(void);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6c5de6c1da27..e5d631197f35 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8692,9 +8692,13 @@ int __cond_resched_rwlock_write(rwlock_t *lock)
}
EXPORT_SYMBOL(__cond_resched_rwlock_write);
-#if defined(CONFIG_PREEMPT_DYNAMIC)
+#if defined(CONFIG_PREEMPT_DYNAMIC) || defined (CONFIG_PREEMPT_AUTO)
+#ifdef CONFIG_PREEMPT_DYNAMIC
#define PREEMPT_MODE "Dynamic Preempt"
+#else
+#define PREEMPT_MODE "Preempt Auto"
+#endif
enum {
preempt_dynamic_undefined = -1,
@@ -8769,11 +8773,11 @@ PREEMPT_MODEL_ACCESSOR(none);
PREEMPT_MODEL_ACCESSOR(voluntary);
PREEMPT_MODEL_ACCESSOR(full);
-#else /* !CONFIG_PREEMPT_DYNAMIC */
+#else /* !CONFIG_PREEMPT_DYNAMIC && !CONFIG_PREEMPT_AUTO */
static inline void preempt_dynamic_init(void) { }
-#endif /* !CONFIG_PREEMPT_DYNAMIC */
+#endif /* !CONFIG_PREEMPT_DYNAMIC && !CONFIG_PREEMPT_AUTO */
#ifdef CONFIG_PREEMPT_DYNAMIC
@@ -8904,7 +8908,26 @@ void sched_dynamic_klp_disable(void)
#endif /* CONFIG_HAVE_PREEMPT_DYNAMIC_CALL */
-#endif /* #ifdef CONFIG_PREEMPT_DYNAMIC */
+#elif defined(CONFIG_PREEMPT_AUTO)
+
+static void __sched_dynamic_update(int mode)
+{
+ switch (mode) {
+ case preempt_dynamic_none:
+ preempt_dynamic_mode = preempt_dynamic_undefined;
+ break;
+
+ case preempt_dynamic_voluntary:
+ preempt_dynamic_mode = preempt_dynamic_undefined;
+ break;
+
+ case preempt_dynamic_full:
+ preempt_dynamic_mode = preempt_dynamic_undefined;
+ break;
+ }
+}
+
+#endif /* CONFIG_PREEMPT_AUTO */
/**
* yield - yield the current processor to other threads.
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 8d5d98a5834d..e53f1b73bf4a 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -216,7 +216,7 @@ static const struct file_operations sched_scaling_fops = {
#endif /* SMP */
-#ifdef CONFIG_PREEMPT_DYNAMIC
+#if defined(CONFIG_PREEMPT_DYNAMIC) || defined(CONFIG_PREEMPT_AUTO)
static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -276,7 +276,7 @@ static const struct file_operations sched_dynamic_fops = {
.release = single_release,
};
-#endif /* CONFIG_PREEMPT_DYNAMIC */
+#endif /* CONFIG_PREEMPT_DYNAMIC || CONFIG_PREEMPT_AUTO */
__read_mostly bool sched_debug_verbose;
@@ -343,7 +343,7 @@ static __init int sched_init_debug(void)
debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops);
-#ifdef CONFIG_PREEMPT_DYNAMIC
+#if defined(CONFIG_PREEMPT_DYNAMIC) || defined(CONFIG_PREEMPT_AUTO)
debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
#endif
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 001fe047bd5d..34899d17553e 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -3229,7 +3229,7 @@ extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *w
extern int try_to_wake_up(struct task_struct *tsk, unsigned int state, int wake_flags);
-#ifdef CONFIG_PREEMPT_DYNAMIC
+#if defined(CONFIG_PREEMPT_DYNAMIC) || defined(CONFIG_PREEMPT_AUTO)
extern int preempt_dynamic_mode;
extern int sched_dynamic_mode(const char *str);
extern void sched_dynamic_update(int mode);
--
2.31.1
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