Messages in this thread | | | Date | Fri, 2 Apr 2021 11:22:11 -0400 | From | Johannes Weiner <> | Subject | Re: [RFC PATCH 03/15] mm: memcontrol: remove the pgdata parameter of mem_cgroup_page_lruvec |
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On Tue, Mar 30, 2021 at 06:15:19PM +0800, Muchun Song wrote: > All the callers of mem_cgroup_page_lruvec() just pass page_pgdat(page) > as the 2nd parameter to it (except isolate_migratepages_block()). But > for isolate_migratepages_block(), the page_pgdat(page) is also equal > to the local variable of @pgdat. So mem_cgroup_page_lruvec() do not > need the pgdat parameter. Just remove it to simplify the code. > > Signed-off-by: Muchun Song <songmuchun@bytedance.com>
There is a minor benefit in not doing the page_pgdat() lookup twice. But I think it only really matters on 32-bit NUMA, where we have more than one node but not enough space in page->flags to store the nid, and so page_to_nid() is out-of-line and needs to go through section.
Those setups aren't really around anymore, and certainly don't justify the hassle (and potential bugs) of the awkward interface.
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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