On Wed, 30 May 2007 19:34:18 +0400
Pavel Emelianov <[email protected]> wrote:
> As described above, pages are charged to their first touchers.
> The first toucher is determined using pages' _mapcount
> manipulations in rmap calls.
>
> Page is charged in two stages:
> 1. preparation, in which the resource availability is checked.
> This stage may lead to page reclamation, thus it is performed
> in a "might-sleep" places;
> 2. the container assignment to page. This is done in an atomic
> code that handles races between multiple touchers.
I suppose we need to think about what to do about higher-order pages, and
compound pages, and hugetlb memory.
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