On 04/06/2013 06:37 PM, Simon Jeons wrote:
Hi Cody,
On 04/06/2013 04:33 AM, Cody P Schafer wrote:
Creates pageset_set_batch() for use in setup_pageset().
pageset_set_batch() imitates the functionality of
setup_pagelist_highmark(), but uses the boot time
(percpu_pagelist_fraction == 0) calculations for determining ->high
Why need adjust pcp->high, pcp->batch during system running? What's the
requirement?
There is currently a sysctl (which I patch later in this series) which
allows adjusting the ->high mark (and, indirectly, ->batch).
Additionally, memory hotplug changes ->high and ->batch due to the zone
size changing (essentially, zone->managed_pages and zone->present_pages
have changed) , meaning that zone_batchsize(), which is used at boot to
set ->batch and (indirectly) ->high has a different output.
Note that in addition to the 2 users of this functionality mentioned
here, I'm currently working on anther resizer of zones (runtime NUMA
reconfiguration).
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