From: Aleksa Sarai <asarai@suse.de>
To: Jonathan Corbet <corbet@lwn.net>, Tejun Heo <tj@kernel.org>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>, Kenny Yu <kennyyu@fb.com>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, Aleksa Sarai <asarai@suse.de>
Subject: [PATCH 2/2] docs: cgroup/pids: update documentation to include pids.events
Date: Fri, 24 Jun 2016 13:00:49 +1000 [thread overview]
Message-ID: <20160624030049.13341-3-asarai@suse.de> (raw)
In-Reply-To: <20160624030049.13341-2-asarai@suse.de>
So that users know what the interface and meaning of the keyed values
are. In addition, mention that the only time that since=0 is when the
limit was changed.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
---
Documentation/cgroup-v1/pids.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/Documentation/cgroup-v1/pids.txt b/Documentation/cgroup-v1/pids.txt
index 1a078b5d281a..a9bb7b964c6f 100644
--- a/Documentation/cgroup-v1/pids.txt
+++ b/Documentation/cgroup-v1/pids.txt
@@ -33,6 +33,11 @@ limit in the hierarchy is followed).
pids.current tracks all child cgroup hierarchies, so parent/pids.current is a
superset of parent/child/pids.current.
+pids.events shows information about the number of failed forks in a particular
+cgroup, both overall (since the cgroup was created) and recently (since the
+last limit reset). Userspace is notified of each time a process failed to fork
+in a cgroup.
+
Example
-------
@@ -83,3 +88,16 @@ sh: fork: Resource temporary unavailable
# /bin/echo "We can't even spawn a single process now."
sh: fork: Resource temporary unavailable
#
+
+We can also see how many times a particular cgroup has failed to fork. For an
+example cgroup:
+
+# cat /sys/fs/cgroup/pids/some_cgroup/pids.events
+since 1
+total 12
+#
+
+This cgroup has had 12 associated process fail to fork throughout its lifetime,
+and has had 1 process fail to fork since the limit was last set. On setting the
+limit, the since counter becomes 0 and userspace is notified (this is the only
+case where since will be 0 and userspace will get a notification).
--
2.8.4
next prev parent reply other threads:[~2016-06-24 2:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-24 3:00 [PATCH 0/2] cgroup: pids: extend pids.events Aleksa Sarai
2016-06-24 3:00 ` [PATCH 1/2] cgroup: pids: show number of failed forks since limit reset Aleksa Sarai
2016-06-24 3:00 ` Aleksa Sarai [this message]
2016-06-24 15:31 ` Tejun Heo
2016-06-26 11:34 ` Aleksa Sarai
2016-06-26 23:42 ` Tejun Heo
2016-06-29 5:10 ` Aleksa Sarai
2016-06-29 15:33 ` Tejun Heo
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