The patch titled
Subject: kernel/kthread.c: partial revert of 81c98869faa5 ("kthread: ensure locality of task_struct allocations")
has been added to the -mm tree. Its filename is
partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations.patch
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From: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx>
Subject: kernel/kthread.c: partial revert of 81c98869faa5 ("kthread: ensure locality of task_struct allocations")
After discussions with Tejun, we don't want to spread the use of
cpu_to_mem() (and thus knowledge of allocators/NUMA topology details) into
callers, but would rather ensure the callees correctly handle memoryless
nodes. With the previous patches ("topology: add support for
node_to_mem_node() to determine the fallback node" and "slub: fallback to
node_to_mem_node() node if allocating on memoryless node") adding and
using node_to_mem_node(), we can safely undo part of the change to the
kthread logic from 81c98869faa5.
Signed-off-by: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Han Pingtian <hanpt@xxxxxxxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kthread.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/kthread.c~partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations kernel/kthread.c
--- a/kernel/kthread.c~partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations
+++ a/kernel/kthread.c
@@ -369,7 +369,7 @@ struct task_struct *kthread_create_on_cp
{
struct task_struct *p;
- p = kthread_create_on_node(threadfn, data, cpu_to_mem(cpu), namefmt,
+ p = kthread_create_on_node(threadfn, data, cpu_to_node(cpu), namefmt,
cpu);
if (IS_ERR(p))
return p;
_
Patches currently in -mm which might be from nacc@xxxxxxxxxxxxxxxxxx are
topology-add-support-for-node_to_mem_node-to-determine-the-fallback-node.patch
slub-fallback-to-node_to_mem_node-node-if-allocating-on-memoryless-node.patch
partial-revert-of-81c98869faa5-kthread-ensure-locality-of-task_struct-allocations.patch
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