(5/11/12 12:20 PM), Christoph Lameter wrote:
On Fri, 11 May 2012, Peter Zijlstra wrote:
On Fri, 2012-05-11 at 13:37 +0900, Minchan Kim wrote:
I hope hear opinion from rt guys, too.
Its a problem yes, not sure your solution is any good though. As it
stands mlock() simply doesn't guarantee no faults, all it does is
guarantee no major faults.
There are two different way to lock pages down in memory that have
different counters in /proc/<pid>/status and also different semantics.
VmLck: Mlocked pages. This means there is a prohibition against evicting
pages. These pages can undergo page migration and therefore also be
handled by compation. These pages have PG_mlock set.
VmPin: Pinned pages. Page cannot be moved. These pages have an elevated
refcount that makes page migration fail.
I don't see VmPin counter in my box. Did you introduce this one recently?
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