Messages in this thread | | | Date | Tue, 8 Sep 2009 11:32:02 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: [rfc] lru_add_drain_all() vs isolation |
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The usefulness of a scheme like this requires:
1. There are cpus that continually execute user space code without system interaction.
2. There are repeated VM activities that require page isolation / migration.
The first page isolation activity will then clear the lru caches of the processes doing number crunching in user space (and therefore the first isolation will still interrupt). The second and following isolation will then no longer interrupt the processes.
2. is rare. So the question is if the additional code in the LRU handling can be justified. If lru handling is not time sensitive then yes.
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