On 09/07/2011 02:26 AM, Paul Menage wrote:
> On Tue, Sep 6, 2011 at 9:23 PM, Glauber Costa<glommer@xxxxxxxxxxxxx> wrote:
>> We aim to control the amount of kernel memory pinned at any
>> time by tcp sockets. To lay the foundations for this work,
>> this patch adds a pointer to the kmem_cgroup to the socket
>> structure.
>>
>> Signed-off-by: Glauber Costa<glommer@xxxxxxxxxxxxx>
>> CC: David S. Miller<davem@xxxxxxxxxxxxx>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@xxxxxxxxxxxxxx>
>> CC: Eric W. Biederman<ebiederm@xxxxxxxxxxxx>
>> ---
>> include/linux/kmem_cgroup.h | 29 +++++++++++++++++++++++++++++
>> include/net/sock.h | 2 ++
>> net/core/sock.c | 5 ++---
>> 3 files changed, 33 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/kmem_cgroup.h b/include/linux/kmem_cgroup.h
>> index 0e4a74b..77076d8 100644
>> --- a/include/linux/kmem_cgroup.h
>> +++ b/include/linux/kmem_cgroup.h
>> @@ -49,5 +49,34 @@ static inline struct kmem_cgroup *kcg_from_task(struct task_struct *tsk)
>> return NULL;
>> }
>> #endif /* CONFIG_CGROUP_KMEM */
>> +
>> +#ifdef CONFIG_INET
>> +#include<net/sock.h>
>> +static inline void sock_update_kmem_cgrp(struct sock *sk)
>> +{
>> +#ifdef CONFIG_CGROUP_KMEM
>> + sk->sk_cgrp = kcg_from_task(current);
>
> BUG_ON(sk->sk_cgrp) ? Or else release the old cgroup if necessary.
Since at least in this current incarnation, I am not doing migrations,
I definitely don't expect to have a pointer already present here.
BUG_ON() it is.
>> @@ -339,6 +340,7 @@ struct sock {
>> #endif
>> __u32 sk_mark;
>> u32 sk_classid;
>> + struct kmem_cgroup *sk_cgrp;
>
> Should this be protected by a #ifdef?
I don't particularly like it. I think that ifdef'ing fields
in structures, while allowing for size optimization, takes away
size and alignment predictability. But... can do.
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