Skip to contentSkip to conversation

kthread: Reduce stack pressure in create_kthread and kthreadd

PATCH Applied Mike Travis 2 participants 2 messages Jul 8, 2008 – Jul 18, 2008

lore
Share & tools
lore

Mike Travis

author
#0 lore raw

PATCH 1/1 kthread: Reduce stack pressure in create_kthread and kthreadd

Subject: [PATCH 1/1] kthread: Reduce stack pressure in create_kthread and kthreadd

* Replace:

set_cpus_allowed(..., CPU_MASK_ALL)

with:

set_cpus_allowed_ptr(..., CPU_MASK_ALL_PTR)

to remove excessive stack requirements when NR_CPUS=4096.

Based on linux-2.6.tip/master

Signed-off-by Mike Travis <[email protected]>
---
 kernel/kthread.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
kernel/kthread.c +2 -2
@@ -107,7 +107,7 @@ static void create_kthread(struct kthrea
 		 */
 		sched_setscheduler(create->result, SCHED_NORMAL, &param);
 		set_user_nice(create->result, KTHREAD_NICE_LEVEL);
-		set_cpus_allowed(create->result, CPU_MASK_ALL);
+		set_cpus_allowed_ptr(create->result, CPU_MASK_ALL_PTR);
 	}
 	complete(&create->done);
 }

@@ -238,7 +238,7 @@ int kthreadd(void *unused)
 	set_task_comm(tsk, "kthreadd");
 	ignore_signals(tsk);
 	set_user_nice(tsk, KTHREAD_NICE_LEVEL);
-	set_cpus_allowed(tsk, CPU_MASK_ALL);
+	set_cpus_allowed_ptr(tsk, CPU_MASK_ALL_PTR);
 
 	current->flags |= PF_NOFREEZE;
Applied
#1 lore raw
Quoted 6 lines · Mike Travis

Subject: [PATCH 1/1] kthread: Reduce stack pressure in create_kthread and kthreadd

* Replace:

set_cpus_allowed(..., CPU_MASK_ALL)

Quoted 7 lines

with:

set_cpus_allowed_ptr(..., CPU_MASK_ALL_PTR)

to remove excessive stack requirements when NR_CPUS=4096.

Based on linux-2.6.tip/master

applied to tip/core/urgent, thanks Mike.

Ingo