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| author | Valentin Schneider <valentin.schneider@arm.com> | 2020-11-02 19:45:12 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-11-10 18:39:06 +0100 |
| commit | 17770579059258c5f1eef759e941af5f1a54f482 (patch) | |
| tree | b57178b2a5d89ebebb869c6a175d6225d47a0c32 /kernel/sched/sched.h | |
| parent | sched/fair: Remove superfluous lock section in do_sched_cfs_slack_timer() (diff) | |
| download | linux-17770579059258c5f1eef759e941af5f1a54f482.tar.xz linux-17770579059258c5f1eef759e941af5f1a54f482.zip | |
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
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index e897d779839f..47258735a93f 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 |