Messages in this thread Patch in this message |  | | From | Cruz Zhao <> | Subject | [PATCH v2] sched/core: Skip sched_core_fork/free() when core sched is disabled | Date | Mon, 25 Apr 2022 04:17:34 +0800 |
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As __put_task_struct() and copy_process() are hot path functions, the call of sched_core_fork/free() will bring overhead when core sched is disabled, and we skip them in these cases.
Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Cruz Zhao <CruzZhao@linux.alibaba.com> --- kernel/sched/core_sched.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/core_sched.c b/kernel/sched/core_sched.c index 38a2cec..72a8ef8 100644 --- a/kernel/sched/core_sched.c +++ b/kernel/sched/core_sched.c @@ -108,13 +108,16 @@ static unsigned long sched_core_clone_cookie(struct task_struct *p) void sched_core_fork(struct task_struct *p) { - RB_CLEAR_NODE(&p->core_node); - p->core_cookie = sched_core_clone_cookie(current); + if (!sched_core_disabled()) { + RB_CLEAR_NODE(&p->core_node); + p->core_cookie = sched_core_clone_cookie(current); + } } void sched_core_free(struct task_struct *p) { - sched_core_put_cookie(p->core_cookie); + if (!sched_core_disabled()) + sched_core_put_cookie(p->core_cookie); } static void __sched_core_set(struct task_struct *p, unsigned long cookie) -- 1.8.3.1
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