linux-kernel - Re: [PATCH 2/5] ipc,msg: move some msgq ns code around

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Message-ID: <5377A325.3030009@colorfullife.com>
Date:	Sat, 17 May 2014 19:57:57 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Davidlohr Bueso <davidlohr@...com>, akpm@...ux-foundation.org
CC:	aswin@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] ipc,msg: move some msgq ns code around

On 05/13/2014 10:27 PM, Davidlohr Bueso wrote:
> Nothing big and no logical changes, just get rid of some
> redundant function declarations. Move msg_[init/exit]_ns
> down the end of the file.
>
> Signed-off-by: Davidlohr Bueso <davidlohr@...com>
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>

> ---
>   ipc/msg.c | 132 ++++++++++++++++++++++++++++++--------------------------------
>   1 file changed, 63 insertions(+), 69 deletions(-)
>
> diff --git a/ipc/msg.c b/ipc/msg.c
> index 5a8489b..6d33e30 100644
> --- a/ipc/msg.c
> +++ b/ipc/msg.c
> @@ -70,75 +70,6 @@ struct msg_sender {
>   
>   #define msg_ids(ns)	((ns)->ids[IPC_MSG_IDS])
>   
> -static void freeque(struct ipc_namespace *, struct kern_ipc_perm *);
> -static int newque(struct ipc_namespace *, struct ipc_params *);
> -#ifdef CONFIG_PROC_FS
> -static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
> -#endif
> -
> -/*
> - * Scale msgmni with the available lowmem size: the memory dedicated to msg
> - * queues should occupy at most 1/MSG_MEM_SCALE of lowmem.
> - * Also take into account the number of nsproxies created so far.
> - * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range.
> - */
> -void recompute_msgmni(struct ipc_namespace *ns)
> -{
> -	struct sysinfo i;
> -	unsigned long allowed;
> -	int nb_ns;
> -
> -	si_meminfo(&i);
> -	allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit)
> -		/ MSGMNB;
> -	nb_ns = atomic_read(&nr_ipc_ns);
> -	allowed /= nb_ns;
> -
> -	if (allowed < MSGMNI) {
> -		ns->msg_ctlmni = MSGMNI;
> -		return;
> -	}
> -
> -	if (allowed > IPCMNI / nb_ns) {
> -		ns->msg_ctlmni = IPCMNI / nb_ns;
> -		return;
> -	}
> -
> -	ns->msg_ctlmni = allowed;
> -}
> -
> -void msg_init_ns(struct ipc_namespace *ns)
> -{
> -	ns->msg_ctlmax = MSGMAX;
> -	ns->msg_ctlmnb = MSGMNB;
> -
> -	recompute_msgmni(ns);
> -
> -	atomic_set(&ns->msg_bytes, 0);
> -	atomic_set(&ns->msg_hdrs, 0);
> -	ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
> -}
> -
> -#ifdef CONFIG_IPC_NS
> -void msg_exit_ns(struct ipc_namespace *ns)
> -{
> -	free_ipcs(ns, &msg_ids(ns), freeque);
> -	idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
> -}
> -#endif
> -
> -void __init msg_init(void)
> -{
> -	msg_init_ns(&init_ipc_ns);
> -
> -	printk(KERN_INFO "msgmni has been set to %d\n",
> -		init_ipc_ns.msg_ctlmni);
> -
> -	ipc_init_proc_interface("sysvipc/msg",
> -				"       key      msqid perms      cbytes       qnum lspid lrpid   uid   gid  cuid  cgid      stime      rtime      ctime\n",
> -				IPC_MSG_IDS, sysvipc_msg_proc_show);
> -}
> -
>   static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)
>   {
>   	struct kern_ipc_perm *ipcp = ipc_obtain_object(&msg_ids(ns), id);
> @@ -1054,6 +985,57 @@ SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
>   	return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
>   }
>   
> +/*
> + * Scale msgmni with the available lowmem size: the memory dedicated to msg
> + * queues should occupy at most 1/MSG_MEM_SCALE of lowmem.
> + * Also take into account the number of nsproxies created so far.
> + * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range.
> + */
> +void recompute_msgmni(struct ipc_namespace *ns)
> +{
> +	struct sysinfo i;
> +	unsigned long allowed;
> +	int nb_ns;
> +
> +	si_meminfo(&i);
> +	allowed = (((i.totalram - i.totalhigh) / MSG_MEM_SCALE) * i.mem_unit)
> +		/ MSGMNB;
> +	nb_ns = atomic_read(&nr_ipc_ns);
> +	allowed /= nb_ns;
> +
> +	if (allowed < MSGMNI) {
> +		ns->msg_ctlmni = MSGMNI;
> +		return;
> +	}
> +
> +	if (allowed > IPCMNI / nb_ns) {
> +		ns->msg_ctlmni = IPCMNI / nb_ns;
> +		return;
> +	}
> +
> +	ns->msg_ctlmni = allowed;
> +}
> +
> +void msg_init_ns(struct ipc_namespace *ns)
> +{
> +	ns->msg_ctlmax = MSGMAX;
> +	ns->msg_ctlmnb = MSGMNB;
> +
> +	recompute_msgmni(ns);
> +
> +	atomic_set(&ns->msg_bytes, 0);
> +	atomic_set(&ns->msg_hdrs, 0);
> +	ipc_init_ids(&ns->ids[IPC_MSG_IDS]);
> +}
> +
> +#ifdef CONFIG_IPC_NS
> +void msg_exit_ns(struct ipc_namespace *ns)
> +{
> +	free_ipcs(ns, &msg_ids(ns), freeque);
> +	idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
> +}
> +#endif
> +
>   #ifdef CONFIG_PROC_FS
>   static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
>   {
> @@ -1078,3 +1060,15 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
>   			msq->q_ctime);
>   }
>   #endif
> +
> +void __init msg_init(void)
> +{
> +	msg_init_ns(&init_ipc_ns);
> +
> +	printk(KERN_INFO "msgmni has been set to %d\n",
> +		init_ipc_ns.msg_ctlmni);
> +
> +	ipc_init_proc_interface("sysvipc/msg",
> +				"       key      msqid perms      cbytes       qnum lspid lrpid   uid   gid  cuid  cgid      stime      rtime      ctime\n",
> +				IPC_MSG_IDS, sysvipc_msg_proc_show);
> +}

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