Re: [Xen-devel] tmem frontswap without swap file

[Vasiliy Tolstov <v.tolstov@xxxxxxxxx>]

2014-02-24 7:32 GMT+04:00 Bob Liu <bob.liu@xxxxxxxxxx>:
> Two types of page can be stored in tmem: persistent_page and ephemeral_page.
>
> Persistent pages are swapped-out pages, whose date can't be dropped by
> tmem. The rule for persistent pages is:
> 'current_domain_pages +  persistent_pages have to smaller than
> domain->max_pages'.
>
> Ephemeral pages are clean pagecache pages, those pages have a copy in
> disk already.
> The amount number of ephemeral pages are not limited, but XEN host will
> reclaim those pages if under memory pressure.
> There is a tmem parameter 'weight' which can be used to control how many
> ephemeral_pages should be reclaimed between domains.


Very good, thanks for answers! What minimal kernel versions recommends
for frontswap/cleancache in domU (dom0 xen 4.3.2)

-- 
Vasiliy Tolstov,
e-mail: v.tolstov@xxxxxxxxx
jabber: vase@xxxxxxxxx

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