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Date: Fri, 6 Nov 2020 17:30:14 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Hui Su <sh_def@....com> Cc: hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com, shakeelb@...gle.com, guro@...com, laoar.shao@...il.com, chris@...isdown.name, linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH] mm/memcontrol:rewrite mem_cgroup_page_lruvec() On Wed, 4 Nov 2020 22:25:16 +0800 Hui Su <sh_def@....com> wrote: > mem_cgroup_page_lruvec() in memcontrol.c and > mem_cgroup_lruvec() in memcontrol.h is very similar > except for the param(page and memcg) which also can be > convert to each other. > > So rewrite mem_cgroup_page_lruvec() with mem_cgroup_lruvec(). Alex Shi's "mm/memcg: warning on !memcg after readahead page charged" (https://lkml.kernel.org/r/1604283436-18880-3-git-send-email-alex.shi@linux.alibaba.com) changes mem_cgroup_page_lruvec() thusly: --- a/mm/memcontrol.c~mm-memcg-warning-on-memcg-after-readahead-page-charged +++ a/mm/memcontrol.c @@ -1325,10 +1325,7 @@ struct lruvec *mem_cgroup_page_lruvec(st } memcg = page_memcg(page); - /* - * Swapcache readahead pages are added to the LRU - and - * possibly migrated - before they are charged. - */ + VM_WARN_ON_ONCE_PAGE(!memcg, page); if (!memcg) memcg = root_mem_cgroup; So the patch didn't apply. That's easily fixed, but it does make one wonder whether this: > -struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *); > +/** > + * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page > + * @page: the page > + * @pgdat: pgdat of the page > + * > + * This function relies on page->mem_cgroup being stable. > + */ > +static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page, > + struct pglist_data *pgdat) > +{ > + struct mem_cgroup *memcg = page->mem_cgroup; > + > + return mem_cgroup_lruvec(memcg, pgdat); > +} Should be using page_memcg()?
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