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[2a03:2880:20ff:15::face:b00c]) by smtp.gmail.com with ESMTPSA id k189-20020a3788c6000000b0069c10860b10sm2576015qkd.107.2022.04.15.07.11.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Apr 2022 07:11:38 -0700 (PDT) Date: Fri, 15 Apr 2022 07:11:35 -0700 From: David Vernet To: Roman Gushchin Cc: Andrew Morton , Tejun Heo , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, Johannes Weiner , Michal Hocko , Shakeel Butt , Chris Down Subject: Re: [PATCH 2/4] kselftests: memcg: speed up the memory.high test Message-ID: <20220415141135.mixe5hin3gvw5kgr@dev0025.ash9.facebook.com> References: <20220415000133.3955987-1-roman.gushchin@linux.dev> <20220415000133.3955987-3-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220415000133.3955987-3-roman.gushchin@linux.dev> User-Agent: NeoMutt/20211029 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 92AD82000C X-Rspam-User: Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf03.hostedemail.com: domain of dcvernet@gmail.com designates 209.85.160.179 as permitted sender) smtp.mailfrom=dcvernet@gmail.com X-Stat-Signature: fhsipijsgyqanjdmn6ijek35f4b3umzd X-HE-Tag: 1650031899-310703 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 14, 2022 at 05:01:31PM -0700, Roman Gushchin wrote: > After commit 0e4b01df8659 ("mm, memcg: throttle allocators when > failing reclaim over memory.high") allocating memory over memory.high > became very time consuming. But it's exactly what the memory.high > test from cgroup kselftests is doing: it tries to allocate 100M with > 30M memory.high value. It takes forever to complete. > > In order to keep it passing (or failing) in a reasonable amount of > time let's try to allocate only a little over 30M: 31M to be precise. > > With this change test_memcontrol finishes in a reasonable amount of > time: > $ time ./test_memcontrol > ok 1 test_memcg_subtree_control > ok 2 test_memcg_current > ok 3 test_memcg_min > ok 4 test_memcg_low > ok 5 test_memcg_high > ok 6 test_memcg_max > ok 7 test_memcg_oom_events > ok 8 test_memcg_swap_max > ok 9 test_memcg_sock > ok 10 test_memcg_oom_group_leaf_events > ok 11 test_memcg_oom_group_parent_events > ok 12 test_memcg_oom_group_score_events > > real 0m2.273s > user 0m0.064s > sys 0m0.739s > > Signed-off-by: Roman Gushchin > Cc: Chris Down > Cc: Johannes Weiner > --- > tools/testing/selftests/cgroup/test_memcontrol.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c > index 00b430e7f2a2..9c1f19fe2e37 100644 > --- a/tools/testing/selftests/cgroup/test_memcontrol.c > +++ b/tools/testing/selftests/cgroup/test_memcontrol.c > @@ -607,7 +607,7 @@ static int test_memcg_high(const char *root) > if (cg_write(memcg, "memory.high", "30M")) > goto cleanup; > > - if (cg_run(memcg, alloc_anon, (void *)MB(100))) > + if (cg_run(memcg, alloc_anon, (void *)MB(31))) > goto cleanup; > > if (!cg_run(memcg, alloc_pagecache_50M_check, NULL)) > -- > 2.35.1 > Thanks for re-sending this. Looks good. Reviewed-by: David Vernet