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clone.2: Note a performance benefit of CLONE_INTO_CGROUP 

As noted in email by Christian Brauner:

    I forgot to mention that spawning directly into a target
    cgroup is also more efficient than moving it after creation.
    The specific reason is mentioned in the commit message
    [ef2c41cf38a], the write lock of the semaphore need not be
    taken in contrast to when it is moved afterwards. That
    implementation details is not that interesting but it might
    be interesting to know that it provides performance benefits
    in general.

Reported-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-05-19 21:41:08 +02:00
parent c0e4ab6356
commit 4fe3acd9e1
1 changed files with 3 additions and 0 deletions
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@ -571,6 +571,9 @@ This eliminates the accounting
jitter that would be caused if the child process was first created in the
same cgroup as the parent and then
moved into the target cgroup.
Furthermore, spawning the child process directly into a target cgroup
is significantly cheaper than moving the child process into
the target cgroup after it has been created.
.IP *
The
.BR CLONE_INTO_CGROUP