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mm: NUMA aware alloc_task_struct_node()

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All kthreads being created from a single helper task, they all use memory
from a single node for their kernel stack and task struct.

This patch suite creates kthread_create_on_cpu(), adding a 'cpu' parameter
to parameters already used by kthread_create().

This parameter serves in allocating memory for the new kthread on its
memory node if available.

Users of this new function are : ksoftirqd, kworker, migration, pktgend...

This patch:

Add a node parameter to alloc_task_struct(), and change its name to
alloc_task_struct_node()

This change is needed to allow NUMA aware kthread_create_on_cpu()

Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: David S. Miller <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
Acked-by: Rusty Russell <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: David Howells <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2011-03-22 16:30:41 -07:00 • committed by Linus Torvalds
commit 504f52b543
5 changed files with 19 additions and 9 deletions
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2
arch/frv/include/asm/processor.h
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@ -137,7 +137,7 @@ unsigned long get_wchan(struct task_struct *p);
#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
/* Allocation and freeing of basic task resources. */
extern struct task_struct *alloc_task_struct(void);
extern struct task_struct *alloc_task_struct_node(int node);
extern void free_task_struct(struct task_struct *p);
#define cpu_relax() barrier()

5
arch/frv/kernel/process.c
View file

@ -44,9 +44,10 @@ asmlinkage void ret_from_fork(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
struct task_struct *alloc_task_struct(void)
struct task_struct *alloc_task_struct_node(int node)
{
struct task_struct *p = kmalloc(THREAD_SIZE, GFP_KERNEL);
struct task_struct *p = kmalloc_node(THREAD_SIZE, GFP_KERNEL, node);
if (p)
atomic_set((atomic_t *)(p+1), 1);
return p;