Re: [PATCH v3 2/4] sched: Introduce migratable()
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2021-08-17 14:43:54
Also in:
linux-arm-kernel, lkml, rcu
On 2021-08-11 21:13:52 [+0100], Valentin Schneider wrote:
quoted hunk ↗ jump to hunk
diff --git a/include/linux/sched.h b/include/linux/sched.h index debc960f41e3..8ba7b4a7ee69 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h@@ -1715,6 +1715,16 @@ static inline bool is_percpu_thread(void) #endif } +/* Is the current task guaranteed to stay on its current CPU? */ +static inline bool migratable(void) +{ +#ifdef CONFIG_SMP + return preemptible() && !current->migration_disabled; +#else + return true;
shouldn't this be false in the UP case?
+#endif +} + /* Per-process atomic flags. */ #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
Sebastian