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    cgroups: make procs file writable · 74a1166d
    Ben Blum 提交于
    Make procs file writable to move all threads by tgid at once.
    
    Add functionality that enables users to move all threads in a threadgroup
    at once to a cgroup by writing the tgid to the 'cgroup.procs' file.  This
    current implementation makes use of a per-threadgroup rwsem that's taken
    for reading in the fork() path to prevent newly forking threads within the
    threadgroup from "escaping" while the move is in progress.
    Signed-off-by: NBen Blum <bblum@andrew.cmu.edu>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    Cc: Matt Helsley <matthltc@us.ibm.com>
    Reviewed-by: NPaul Menage <menage@google.com>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Miao Xie <miaox@cn.fujitsu.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    74a1166d
cgroup.c 139.6 KB