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From: Roman Gushchin To: David Vernet Cc: akpm@linux-foundation.org, tj@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, mhocko@kernel.org, shakeelb@google.com, kernel-team@fb.com Subject: Re: [PATCH 3/5] cgroup: Account for memory_localevents in test_memcg_oom_group_leaf_events() Message-ID: References: <20220422155728.3055914-1-void@manifault.com> <20220422155728.3055914-4-void@manifault.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220422155728.3055914-4-void@manifault.com> X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Rspamd-Queue-Id: 3177E4002A X-Stat-Signature: 6hwt9pds1cjyw5qw9i6m6srd66qewxdq X-Rspam-User: Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=WWhuDxyn; spf=pass (imf04.hostedemail.com: domain of roman.gushchin@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-Rspamd-Server: rspam09 X-HE-Tag: 1650669294-613039 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 Fri, Apr 22, 2022 at 08:57:27AM -0700, David Vernet wrote: > The test_memcg_oom_group_leaf_events() testcase in the cgroup memcg tests > validates that processes in a group that perform allocations exceeding > memory.oom.group are killed. It also validates that the > memory.events.oom_kill events are properly propagated in this case. Commit > 06e11c907ea4 ("kselftests: memcg: update the oom group leaf events test") > fixed test_memcg_oom_group_leaf_events() to account for the fact that the > memory.events.oom_kill events in a child cgroup is propagated up to its > parent. This behavior can actually be configured by the memory_localevents > mount option, so this patch updates the testcase to properly account for > the possible presence of this mount option. > > Signed-off-by: David Vernet > --- > .../testing/selftests/cgroup/test_memcontrol.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c > index ea2fd27e52df..d88e0ca3f3d1 100644 > --- a/tools/testing/selftests/cgroup/test_memcontrol.c > +++ b/tools/testing/selftests/cgroup/test_memcontrol.c > @@ -21,6 +21,7 @@ > #include "../kselftest.h" > #include "cgroup_util.h" > > +static bool has_localevents; > static bool has_recursiveprot; > > /* > @@ -1091,6 +1092,7 @@ static int test_memcg_oom_group_leaf_events(const char *root) > { > int ret = KSFT_FAIL; > char *parent, *child; > + long parent_oom_events; > > parent = cg_name(root, "memcg_test_0"); > child = cg_name(root, "memcg_test_0/memcg_test_1"); > @@ -1128,7 +1130,15 @@ static int test_memcg_oom_group_leaf_events(const char *root) > if (cg_read_key_long(child, "memory.events", "oom_kill ") <= 0) > goto cleanup; > > - if (cg_read_key_long(parent, "memory.events", "oom_kill ") <= 0) > + parent_oom_events = cg_read_key_long( > + parent, "memory.events", "oom_kill "); > + // If memory_localevents is not enabled (the default), the parent should > + // count OOM events in its children groups. Otherwise, it should not > + // have observed any events. Please, use /* */ style comments, it's a generic kernel style. > + if (has_localevents) { > + if (parent_oom_events != 0) > + goto cleanup; > + } else if (parent_oom_events <= 0) > goto cleanup; How about something like this? IMO a bit more clear what's going on. if ((has_local_events && parent_oom_events == 0) || parent_oom_events > 0) ret = KSFT_PASS; Anyway, looks good to me. Acked-by: Roman Gushchin > > ret = KSFT_PASS; > @@ -1298,6 +1308,11 @@ int main(int argc, char **argv) > ksft_exit_skip("Failed to query cgroup mount option\n"); > has_recursiveprot = proc_status; > > + proc_status = proc_mount_contains("memory_localevents"); > + if (proc_status < 0) > + ksft_exit_skip("Failed to query cgroup mount option\n"); > + has_localevents = proc_status; > + > for (i = 0; i < ARRAY_SIZE(tests); i++) { > switch (tests[i].fn(root)) { > case KSFT_PASS: > -- > 2.30.2 >