linux-kernel - [PATCH 1/1] kthread: Reduce stack pressure in create

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Date:	Tue, 08 Jul 2008 15:55:48 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [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 <travis@....com>
---
 kernel/kthread.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-2.6.tip.orig/kernel/kthread.c
+++ linux-2.6.tip/kernel/kthread.c
@@ -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;
 
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