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SubjectRe: [patch 1/3] mm: embed the memcg pointer directly into struct page
On Sat, Nov 01, 2014 at 11:15:54PM -0400, Johannes Weiner wrote:
> Memory cgroups used to have 5 per-page pointers. To allow users to
> disable that amount of overhead during runtime, those pointers were
> allocated in a separate array, with a translation layer between them
> and struct page.
>
> There is now only one page pointer remaining: the memcg pointer, that
> indicates which cgroup the page is associated with when charged. The
> complexity of runtime allocation and the runtime translation overhead
> is no longer justified to save that *potential* 0.19% of memory.

How much do you win by the change?

--
Kirill A. Shutemov


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