Messages in this thread | | | Date | Thu, 20 Jan 2011 09:00:09 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [REPOST] [PATCH 3/3] Provide control over unmapped pages (v3) |
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On Thu, 20 Jan 2011, Balbir Singh wrote:
> + unmapped_page_control > + [KNL] Available if CONFIG_UNMAPPED_PAGECACHE_CONTROL > + is enabled. It controls the amount of unmapped memory > + that is present in the system. This boot option plus > + vm.min_unmapped_ratio (sysctl) provide granular control
min_unmapped_ratio is there to guarantee that zone reclaim does not reclaim all unmapped pages.
What you want here is a max_unmapped_ratio.
> { > @@ -2297,6 +2320,12 @@ loop_again: > shrink_active_list(SWAP_CLUSTER_MAX, zone, > &sc, priority, 0); > > + /* > + * We do unmapped page reclaim once here and once > + * below, so that we don't lose out > + */ > + reclaim_unmapped_pages(priority, zone, &sc); > + > if (!zone_watermark_ok_safe(zone, order,
Hmmmm. Okay that means background reclaim does it. If so then we also want zone reclaim to be able to work in the background I think. max_unmapped_ratio could also be useful to the zone reclaim logic.
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