On Wed, 27 Jun 2012 11:09:31 +0900 Minchan Kim [off-list ref] wrote:

On 06/27/2012 10:15 AM, Andrew Morton wrote:

quoted

quoted

Considering mlock and CPU pinning

quoted

of realtime thread is very rare, it might be rather expensive solution.
Unfortunately, I have no idea better than you suggested. :(

And looking 8891d6da17, mlock's lru_add_drain_all isn't must.
If it's really bother us, couldn't we remove it?

"grep lru_add_drain_all mm/*.c".  They're all problematic.

Yeb but I'm not sure such system modeling is good.
Potentially, It could make problem once we use workqueue of other CPU.

whut?

My suggestion is that we switch lru_add_drain_all() to on_each_cpu()
and delete schedule_on_each_cpu().  No workqueues.

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