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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-07 13:10:31 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-07 23:01:35 +0200 |
| commit | 87402a2e5bb1f14f63ae20e3c00b4165d8b91c69 (patch) | |
| tree | 3cae172f02404e09a8175ba3135bd5fd4dcb09a9 | |
| parent | 9ed582ac20ca50521ccba9e7d78468354497920d (diff) | |
| download | man-pages-87402a2e5bb1f14f63ae20e3c00b4165d8b91c69.tar.gz | |
cgroups.7: Clarify discussion of the "tasks" file
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man7/cgroups.7 | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/man7/cgroups.7 b/man7/cgroups.7 index e6cbbd08b5..f80fe6282f 100644 --- a/man7/cgroups.7 +++ b/man7/cgroups.7 @@ -222,20 +222,32 @@ A new cgroup is created by creating a directory in the cgroup filesystem: mkdir /sys/fs/cgroup/cpu/cg1 This creates a new empty cgroup. -Processes (threads) may be moved to this cgroup by writing -their PIDs (TIDs) into the cgroup's +Processes may be moved to this cgroup by writing +their PIDs into the cgroup's .I cgroup.procs -.RI ( tasks ) file: echo $$ > /sys/fs/cgroup/cpu/cg1/cgroup.procs -The same files can be read to obtain a list of the processes (threads) +The same file can be read to obtain a list of the processes that are currently in .IR cg1 . When writing a PID into the .IR cgroup.procs , -all tasks in the process are moved into the new cgroup at once. +all threads in the process are moved into the new cgroup at once. + +In cgroups v1 (but not cgroups v2), an individual thread can be moved to +another cgroup by writing its thread ID +(i.e., the kernel thread ID returned by +.BR clone (2) +and +.BR gettid (2)) +to the +.IR tasks +file in a cgroup directory. +This file can be read to discover the set of threads +that are members of the cgroup. +This file is not present in cgroup v2 directories. A child process created via .BR fork (2) |