From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal =?unknown-8bit?q?Koutn=C3=BD?= Date: Thu, 29 Oct 2020 16:39:21 +0100 Subject: [LTP] [PATCH v2] mm: memcg: link page counters to root if use_hierarchy is false In-Reply-To: <20201026231326.3212225-1-guro@fb.com> References: <20201026231326.3212225-1-guro@fb.com> Message-ID: <20201029153921.GC9928@blackbook> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it Hi. On Mon, Oct 26, 2020 at 04:13:26PM -0700, Roman Gushchin wrote: > Please note, that in the non-hierarchical mode all objcgs are always > reparented to the root memory cgroup, even if the hierarchy has more > than 1 level. This patch doesn't change it. > > The patch also doesn't affect how the hierarchical mode is working, > which is the only sane and truly supported mode now. I agree with the patch and you can add Reviewed-by: Michal Koutn? However, it effectively switches any users of root.use_hierarchy=0 (if there are any, watching the counters of root memcg) into root.use_hierarchy=1. So I'd show them the warning even with a single level of cgroups, i.e. add this hunk @@ -5356,12 +5356,11 @@ page_counter_init(&memcg->kmem, &root_mem_cgroup->kmem); page_counter_init(&memcg->tcpmem, &root_mem_cgroup->tcpmem); /* - * Deeper hierachy with use_hierarchy == false doesn't make + * Hierachy with use_hierarchy == false doesn't make * much sense so let cgroup subsystem know about this * unfortunate state in our controller. */ - if (parent != root_mem_cgroup) - memory_cgrp_subsys.broken_hierarchy = true; + memory_cgrp_subsys.broken_hierarchy = true; } /* The following stuff does not apply to the root */ What do you think? Michal -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 833 bytes Desc: Digital signature URL: