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    SubjectRe: [PATCH 02/10] cgroups: New resource counter inheritance API
    On Mon, Oct 03, 2011 at 09:07:04PM +0200, Frederic Weisbecker wrote:
    > Provide an API to inherit a counter value from a parent.
    > This can be useful to implement cgroup.clone_children on
    > a resource counter.
    >
    > Still the resources of the children are limited by those
    > of the parent, so this is only to provide a default setting
    > behaviour when clone_children is set.
    >
    > Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

    Acked-by: Kirill A. Shutemov <kirill@shutemov.name>

    > Cc: Paul Menage <paul@paulmenage.org>
    > Cc: Li Zefan <lizf@cn.fujitsu.com>
    > Cc: Johannes Weiner <hannes@cmpxchg.org>
    > Cc: Aditya Kali <adityakali@google.com>
    > Cc: Oleg Nesterov <oleg@redhat.com>
    > Cc: Andrew Morton <akpm@linux-foundation.org>
    > Cc: Kay Sievers <kay.sievers@vrfy.org>
    > Cc: Tim Hockin <thockin@hockin.org>
    > Cc: Tejun Heo <tj@kernel.org>
    > Cc: Kirill A. Shutemov <kirill@shutemov.name>
    > Cc: Containers <containers@lists.linux-foundation.org>
    > ---
    > include/linux/res_counter.h | 2 ++
    > kernel/res_counter.c | 18 ++++++++++++++++++
    > 2 files changed, 20 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
    > index 1b3fe05..109d118 100644
    > --- a/include/linux/res_counter.h
    > +++ b/include/linux/res_counter.h
    > @@ -84,6 +84,8 @@ int res_counter_write(struct res_counter *counter, int member,
    >
    > void res_counter_write_u64(struct res_counter *counter, int member, u64 val);
    >
    > +void res_counter_inherit(struct res_counter *counter, int member);
    > +
    > /*
    > * the field descriptors. one for each member of res_counter
    > */
    > diff --git a/kernel/res_counter.c b/kernel/res_counter.c
    > index 0faafcc..37abf4e 100644
    > --- a/kernel/res_counter.c
    > +++ b/kernel/res_counter.c
    > @@ -202,3 +202,21 @@ int res_counter_write(struct res_counter *counter, int member,
    >
    > return 0;
    > }
    > +
    > +/*
    > + * Simple inheritance implementation to get the same value
    > + * than a parent. However this doesn't enforce the child value
    > + * to be always below the one of the parent. But the child is
    > + * subject to its parent limitation anyway.
    > + */
    > +void res_counter_inherit(struct res_counter *counter, int member)
    > +{
    > + struct res_counter *parent;
    > + unsigned long long val;
    > +
    > + parent = counter->parent;
    > + if (parent) {
    > + val = res_counter_read_u64(parent, member);
    > + res_counter_write_u64(counter, member, val);
    > + }
    > +}
    > --
    > 1.7.5.4
    >

    --
    Kirill A. Shutemov


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