Messages in this thread | | | Date | Wed, 25 May 2022 21:08:51 +0800 | From | Muchun Song <> | Subject | Re: [PATCH v4 01/11] mm: memcontrol: prepare objcg API for non-kmem usage |
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On Wed, May 25, 2022 at 08:37:58AM -0400, Johannes Weiner wrote: > On Wed, May 25, 2022 at 03:57:17PM +0800, Muchun Song wrote: > > On Tue, May 24, 2022 at 07:36:24PM -0700, Roman Gushchin wrote: > > > On Tue, May 24, 2022 at 02:05:41PM +0800, Muchun Song wrote: > > > > - memcg_reparent_list_lrus(memcg, parent); > > > > + memcg_reparent_list_lrus(memcg, parent_mem_cgroup(memcg)); > > > We effectively dropped this: > > > if (!parent) > > > parent = root_mem_cgroup; > > > Is it safe? (assuming v1 non-hierarchical mode, it's usually when all > > > is getting complicated) > > Yes, it's correct. But it's a quiet, incidental cleanup, so I can see > why it's confusing. It might be better to split the dead code removal > into a separate patch - with the following in the changelog ;): >
Well, I can split the dead code removal into a separate patch. :-)
Thanks.
> > Since no-hierarchy mode is deprecated after commit bef8620cd8e0 > > ("mm: memcg: deprecate the non-hierarchical mode"), so > > parent_mem_cgroup() cannot return a NULL except root memcg, > > however, root memcg will not be offline, so it is safe. Right? >
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