sched_ext: Pass locked CPU parameter to scx_hardlockup() and add docs

With the buddy lockup detector, smp_processor_id() returns the detecting CPU,
not the locked CPU, making scx_hardlockup()'s printouts confusing. Pass the
locked CPU number from watchdog_hardlockup_check() as a parameter instead.

Also add kerneldoc comments to handle_lockup(), scx_hardlockup(), and
scx_rcu_cpu_stall() documenting their return value semantics.

Suggested-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/include/linux/sched/ext.h b/include/linux/sched/ext.h
index 70ee5c28a74def72e9d17876e27b4da36e6be14d..bcb962d5ee7d8bd1ed4d563c9ef2c676d7e0bf6d 100644 (file)
--- a/include/linux/sched/ext.h
+++ b/include/linux/sched/ext.h
@@ -230,7 +230,7 @@ struct sched_ext_entity {
 void sched_ext_dead(struct task_struct *p);
 void print_scx_info(const char *log_lvl, struct task_struct *p);
 void scx_softlockup(u32 dur_s);
-bool scx_hardlockup(void);
+bool scx_hardlockup(int cpu);
 bool scx_rcu_cpu_stall(void);
 
 #else  /* !CONFIG_SCHED_CLASS_EXT */
@@ -238,7 +238,7 @@ bool scx_rcu_cpu_stall(void);
 static inline void sched_ext_dead(struct task_struct *p) {}
 static inline void print_scx_info(const char *log_lvl, struct task_struct *p) {}
 static inline void scx_softlockup(u32 dur_s) {}
-static inline bool scx_hardlockup(void) { return false; }
+static inline bool scx_hardlockup(int cpu) { return false; }
 static inline bool scx_rcu_cpu_stall(void) { return false; }
 
 #endif /* CONFIG_SCHED_CLASS_EXT */

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 8a3b8f64a06be316de410a6f8cae89f461b961fe..918573f3f0881a545907b5c5d71d68599a54579b 100644 (file)
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -3687,6 +3687,17 @@ bool scx_allow_ttwu_queue(const struct task_struct *p)
        return false;
 }
 
+/**
+ * handle_lockup - sched_ext common lockup handler
+ * @fmt: format string
+ *
+ * Called on system stall or lockup condition and initiates abort of sched_ext
+ * if enabled, which may resolve the reported lockup.
+ *
+ * Returns %true if sched_ext is enabled and abort was initiated, which may
+ * resolve the lockup. %false if sched_ext is not enabled or abort was already
+ * initiated by someone else.
+ */
 static __printf(1, 2) bool handle_lockup(const char *fmt, ...)
 {
        struct scx_sched *sch;
@@ -3718,6 +3729,10 @@ static __printf(1, 2) bool handle_lockup(const char *fmt, ...)
  * that may not be caused by the current BPF scheduler, try kicking out the
  * current scheduler in an attempt to recover the system to a good state before
  * issuing panics.
+ *
+ * Returns %true if sched_ext is enabled and abort was initiated, which may
+ * resolve the reported RCU stall. %false if sched_ext is not enabled or someone
+ * else already initiated abort.
  */
 bool scx_rcu_cpu_stall(void)
 {
@@ -3750,14 +3765,18 @@ void scx_softlockup(u32 dur_s)
  * numerous affinitized tasks in a single queue and directing all CPUs at it.
  * Try kicking out the current scheduler in an attempt to recover the system to
  * a good state before taking more drastic actions.
+ *
+ * Returns %true if sched_ext is enabled and abort was initiated, which may
+ * resolve the reported hardlockdup. %false if sched_ext is not enabled or
+ * someone else already initiated abort.
  */
-bool scx_hardlockup(void)
+bool scx_hardlockup(int cpu)
 {
-       if (!handle_lockup("hard lockup - CPU %d", smp_processor_id()))
+       if (!handle_lockup("hard lockup - CPU %d", cpu))
                return false;
 
        printk_deferred(KERN_ERR "sched_ext: Hard lockup - CPU %d, disabling BPF scheduler\n",
-                       smp_processor_id());
+                       cpu);
        return true;
 }
 

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 8dfac4a8f587ba01e4b3bca996564e8eddef84d1..873020a2a581305b5749fd7069e2e0f19a93ddcb 100644 (file)
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -203,7 +203,7 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
                 * only once when sched_ext is enabled and will immediately
                 * abort the BPF scheduler and print out a warning message.
                 */
-               if (scx_hardlockup())
+               if (scx_hardlockup(cpu))
                        return;
 
                /* Only print hardlockups once. */