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Subject[tip: sched/core] sched: Add WF_TTWU, WF_EXEC wakeup flags
The following commit has been merged into the sched/core branch of tip:

Commit-ID: 17770579059258c5f1eef759e941af5f1a54f482
Gitweb: https://git.kernel.org/tip/17770579059258c5f1eef759e941af5f1a54f482
Author: Valentin Schneider <valentin.schneider@arm.com>
AuthorDate: Mon, 02 Nov 2020 18:45:12
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 10 Nov 2020 18:39:06 +01:00

sched: Add WF_TTWU, WF_EXEC wakeup flags

To remove the sd_flag parameter of select_task_rq(), we need another way of
encoding wakeup types. There already is a WF_FORK flag, add the missing two.

With that said, we still need an easy way to turn WF_foo into
SD_bar (e.g. WF_TTWU into SD_BALANCE_WAKE). As suggested by Peter, let's
make our lives easier and make them match exactly, and throw in some
compile-time checks for good measure.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201102184514.2733-2-valentin.schneider@arm.com
---
kernel/sched/sched.h | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index e897d77..4725873 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1744,13 +1744,20 @@ static inline int task_on_rq_migrating(struct task_struct *p)
return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
}

-/*
- * wake flags
- */
-#define WF_SYNC 0x01 /* Waker goes to sleep after wakeup */
-#define WF_FORK 0x02 /* Child wakeup after fork */
-#define WF_MIGRATED 0x04 /* Internal use, task got migrated */
-#define WF_ON_CPU 0x08 /* Wakee is on_cpu */
+/* Wake flags. The first three directly map to some SD flag value */
+#define WF_EXEC 0x02 /* Wakeup after exec; maps to SD_BALANCE_EXEC */
+#define WF_FORK 0x04 /* Wakeup after fork; maps to SD_BALANCE_FORK */
+#define WF_TTWU 0x08 /* Wakeup; maps to SD_BALANCE_WAKE */
+
+#define WF_SYNC 0x10 /* Waker goes to sleep after wakeup */
+#define WF_MIGRATED 0x20 /* Internal use, task got migrated */
+#define WF_ON_CPU 0x40 /* Wakee is on_cpu */
+
+#ifdef CONFIG_SMP
+static_assert(WF_EXEC == SD_BALANCE_EXEC);
+static_assert(WF_FORK == SD_BALANCE_FORK);
+static_assert(WF_TTWU == SD_BALANCE_WAKE);
+#endif

/*
* To aid in avoiding the subversion of "niceness" due to uneven distribution
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