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    Subject[PATCH 1/3] Cgroups: add the trigger callback to struct cftype
    Trigger callback can be used to receive a kick-up from the
    user space. The string written is ignored.

    The cftype->private is used for multiplexing events.

    Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
    Acked-by: Paul Menage <menage@google.com>
    Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

    ---
    include/linux/cgroup.h | 8 ++++++++
    kernel/cgroup.c | 4 ++++
    2 files changed, 12 insertions(+), 0 deletions(-)

    diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
    index 785a01c..2d1d151 100644
    --- a/include/linux/cgroup.h
    +++ b/include/linux/cgroup.h
    @@ -243,6 +243,14 @@ struct cftype {
    */
    int (*write_s64) (struct cgroup *cgrp, struct cftype *cft, s64 val);

    + /*
    + * trigger() callback can be used to get some kick from the
    + * userspace, when the actual string written is not important
    + * at all. The private field can be used to determine the
    + * kick type for multiplexing.
    + */
    + int (*trigger)(struct cgroup *cgrp, unsigned int event);
    +
    int (*release) (struct inode *inode, struct file *file);
    };

    diff --git a/kernel/cgroup.c b/kernel/cgroup.c
    index e8e8ec4..f2d8f25 100644
    --- a/kernel/cgroup.c
    +++ b/kernel/cgroup.c
    @@ -1410,6 +1410,10 @@ static ssize_t cgroup_file_write(struct file *file, const char __user *buf,
    return cft->write(cgrp, cft, file, buf, nbytes, ppos);
    if (cft->write_u64 || cft->write_s64)
    return cgroup_write_X64(cgrp, cft, file, buf, nbytes, ppos);
    + if (cft->trigger) {
    + int ret = cft->trigger(cgrp, (unsigned int)cft->private);
    + return ret ? ret : nbytes;
    + }
    return -EINVAL;
    }

    --
    1.5.3.4



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