Re: [PATCH v5 08/24] sched: Introduce per memory space current virtual cpu id

On 2022-11-08 08:00, Peter Zijlstra wrote:

On Thu, Nov 03, 2022 at 04:03:43PM -0400, Mathieu Desnoyers wrote:

quoted

diff --git a/fs/exec.c b/fs/exec.c
index 349a5da91efe..93eb88f4053b 100644
--- a/fs/exec.c
+++ b/fs/exec.c

@@ -1013,6 +1013,9 @@ static int exec_mmap(struct mm_struct *mm)
  	tsk->active_mm = mm;
  	tsk->mm = mm;
  	lru_gen_add_mm(mm);
+	mm_init_vcpu_lock(mm);
+	mm_init_vcpumask(mm);
+	mm_init_node_vcpumask(mm);
  	/*
  	 * This prevents preemption while active_mm is being loaded and
  	 * it and mm are being updated, which could cause problems for

quoted

@@ -1150,6 +1154,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
  
  	mm->user_ns = get_user_ns(user_ns);
  	lru_gen_init_mm(mm);
+	mm_init_vcpu_lock(mm);
+	mm_init_vcpumask(mm);
+	mm_init_node_vcpumask(mm);
  	return mm;
  
  fail_nocontext:

Why isn't all that a single mm_init_vcpu(mm) or something ?

Good point, I'll update that.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com