From: Roman Gushchin <guro@fb.com>
To: Alexei Starovoitov <ast@kernel.org>, <bpf@vger.kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>, <netdev@vger.kernel.org>,
Tejun Heo <tj@kernel.org>, <kernel-team@fb.com>,
<cgroups@vger.kernel.org>, Stanislav Fomichev <sdf@fomichev.me>,
Yonghong Song <yhs@fb.com>, <linux-kernel@vger.kernel.org>,
Roman Gushchin <guro@fb.com>
Subject: [PATCH v3 bpf-next 3/4] selftests/bpf: enable all available cgroup v2 controllers
Date: Thu, 23 May 2019 12:45:31 -0700 [thread overview]
Message-ID: <20190523194532.2376233-4-guro@fb.com> (raw)
In-Reply-To: <20190523194532.2376233-1-guro@fb.com>
Enable all available cgroup v2 controllers when setting up
the environment for the bpf kselftests. It's required to properly test
the bpf prog auto-detach feature. Also it will generally increase
the code coverage.
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
---
tools/testing/selftests/bpf/cgroup_helpers.c | 57 ++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c b/tools/testing/selftests/bpf/cgroup_helpers.c
index 6692a40a6979..0d89f0396be4 100644
--- a/tools/testing/selftests/bpf/cgroup_helpers.c
+++ b/tools/testing/selftests/bpf/cgroup_helpers.c
@@ -33,6 +33,60 @@
snprintf(buf, sizeof(buf), "%s%s%s", CGROUP_MOUNT_PATH, \
CGROUP_WORK_DIR, path)
+/**
+ * enable_all_controllers() - Enable all available cgroup v2 controllers
+ *
+ * Enable all available cgroup v2 controllers in order to increase
+ * the code coverage.
+ *
+ * If successful, 0 is returned.
+ */
+int enable_all_controllers(char *cgroup_path)
+{
+ char path[PATH_MAX + 1];
+ char buf[PATH_MAX];
+ char *c, *c2;
+ int fd, cfd;
+ size_t len;
+
+ snprintf(path, sizeof(path), "%s/cgroup.controllers", cgroup_path);
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ log_err("Opening cgroup.controllers: %s", path);
+ return 1;
+ }
+
+ len = read(fd, buf, sizeof(buf) - 1);
+ if (len < 0) {
+ close(fd);
+ log_err("Reading cgroup.controllers: %s", path);
+ return 1;
+ }
+ buf[len] = 0;
+ close(fd);
+
+ /* No controllers available? We're probably on cgroup v1. */
+ if (len == 0)
+ return 0;
+
+ snprintf(path, sizeof(path), "%s/cgroup.subtree_control", cgroup_path);
+ cfd = open(path, O_RDWR);
+ if (cfd < 0) {
+ log_err("Opening cgroup.subtree_control: %s", path);
+ return 1;
+ }
+
+ for (c = strtok_r(buf, " ", &c2); c; c = strtok_r(NULL, " ", &c2)) {
+ if (dprintf(cfd, "+%s\n", c) <= 0) {
+ log_err("Enabling controller %s: %s", c, path);
+ close(cfd);
+ return 1;
+ }
+ }
+ close(cfd);
+ return 0;
+}
+
/**
* setup_cgroup_environment() - Setup the cgroup environment
*
@@ -71,6 +125,9 @@ int setup_cgroup_environment(void)
return 1;
}
+ if (enable_all_controllers(cgroup_workdir))
+ return 1;
+
return 0;
}
--
2.20.1
next prev parent reply other threads:[~2019-05-23 19:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 19:45 [PATCH v3 bpf-next 0/4] cgroup bpf auto-detachment Roman Gushchin
2019-05-23 19:45 ` [PATCH v3 bpf-next 2/4] selftests/bpf: convert test_cgrp2_attach2 example into kselftest Roman Gushchin
2019-05-23 19:45 ` Roman Gushchin [this message]
2019-05-23 19:45 ` [PATCH v3 bpf-next 4/4] selftests/bpf: add auto-detach test Roman Gushchin
2019-05-23 23:09 ` Yonghong Song
2019-05-23 23:43 ` Roman Gushchin
2019-05-23 23:49 ` Roman Gushchin
2019-05-24 21:03 ` [PATCH v3 bpf-next 0/4] cgroup bpf auto-detachment Alexei Starovoitov
2019-05-24 21:40 ` Roman Gushchin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190523194532.2376233-4-guro@fb.com \
--to=guro@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=cgroups@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=kernel-team@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=sdf@fomichev.me \
--cc=tj@kernel.org \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).