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| author | Peter Zijlstra <peterz@infradead.org> | 2021-05-04 22:43:36 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-05-12 11:43:25 +0200 |
| commit | eee4d9fee2544389e5ce5697ed92db67c86d7a9f (patch) | |
| tree | 3f6f000928209912313d34bc3ca383cea1f94fd7 /kernel/delayacct.c | |
| parent | 63b3f96e1a989846a5a521d4fbef4bc86406929d (diff) | |
| download | linux-eee4d9fee2544389e5ce5697ed92db67c86d7a9f.tar.gz linux-eee4d9fee2544389e5ce5697ed92db67c86d7a9f.tar.bz2 linux-eee4d9fee2544389e5ce5697ed92db67c86d7a9f.zip | |
delayacct: Add static_branch in scheduler hooks
Cheaper when delayacct is disabled.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lkml.kernel.org/r/20210505111525.248028369@infradead.org
Diffstat (limited to 'kernel/delayacct.c')
| -rw-r--r-- | kernel/delayacct.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/delayacct.c b/kernel/delayacct.c index 3a0b910386d1..63012fd39ae2 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -14,6 +14,7 @@ #include <linux/delayacct.h> #include <linux/module.h> +DEFINE_STATIC_KEY_TRUE(delayacct_key); int delayacct_on __read_mostly = 1; /* Delay accounting turned on/off */ struct kmem_cache *delayacct_cache; @@ -28,6 +29,8 @@ void delayacct_init(void) { delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT); delayacct_tsk_init(&init_task); + if (!delayacct_on) + static_branch_disable(&delayacct_key); } void __delayacct_tsk_init(struct task_struct *tsk) |