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From: Nadia.Derbey@bull.net To: linux-kernel@vger.kernel.org, y-goto@jp.fujitsu.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, containers@lists.linux-foundation.org, matthltc@us.ibm.com, cmm@us.ibm.com, Nadia Derbey <Nadia.Derbey@bull.net> Subject: [PATCH 6/8] Recomputing msgmni on ipc namespace creation/removal Date: Mon, 11 Feb 2008 15:16:52 +0100 [thread overview] Message-ID: <20080211141815.655523000@bull.net> (raw) In-Reply-To: 20080211141646.948191000@bull.net [-- Attachment #1: ipc_recompute_msgmni_on_ipcns_create_remove.patch --] [-- Type: text/plain, Size: 4604 bytes --] [PATCH 06/08] This patch introduces a notification mechanism that aims at recomputing msgmni each time an ipc namespace is created or removed. The ipc namespace notifier chain already defined for memory hotplug management is used for that purpose too. Each time a new ipc namespace is allocated or an existing ipc namespace is removed, the ipcns notifier chain is notified. The callback routine for each registered ipc namespace is then activated in order to recompute msgmni for that namespace. Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net> --- include/linux/ipc_namespace.h | 25 ++----------------------- ipc/Makefile | 3 +-- ipc/ipcns_notifier.c | 2 ++ ipc/namespace.c | 12 ++++++++++++ 4 files changed, 17 insertions(+), 25 deletions(-) Index: linux-2.6.24-mm1/include/linux/ipc_namespace.h =================================================================== --- linux-2.6.24-mm1.orig/include/linux/ipc_namespace.h 2008-02-08 08:29:21.000000000 +0100 +++ linux-2.6.24-mm1/include/linux/ipc_namespace.h 2008-02-08 14:35:08.000000000 +0100 @@ -4,14 +4,14 @@ #include <linux/err.h> #include <linux/idr.h> #include <linux/rwsem.h> -#ifdef CONFIG_MEMORY_HOTPLUG #include <linux/notifier.h> -#endif /* CONFIG_MEMORY_HOTPLUG */ /* * ipc namespace events */ #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ +#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */ +#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */ #define IPCNS_CALLBACK_PRI 0 @@ -42,9 +42,7 @@ struct ipc_namespace { int shm_ctlmni; int shm_tot; -#ifdef CONFIG_MEMORY_HOTPLUG struct notifier_block ipcns_nb; -#endif }; extern struct ipc_namespace init_ipc_ns; @@ -53,29 +51,10 @@ extern atomic_t nr_ipc_ns; #ifdef CONFIG_SYSVIPC #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, -#ifdef CONFIG_MEMORY_HOTPLUG - extern int register_ipcns_notifier(struct ipc_namespace *); extern int unregister_ipcns_notifier(struct ipc_namespace *); extern int ipcns_notify(unsigned long); -#else /* CONFIG_MEMORY_HOTPLUG */ - -static inline int register_ipcns_notifier(struct ipc_namespace *ipcns) -{ - return 0; -} -static inline int unregister_ipcns_notifier(struct ipc_namespace *ipcns) -{ - return 0; -} -static inline int ipcns_notify(unsigned long ev) -{ - return 0; -} - -#endif /* CONFIG_MEMORY_HOTPLUG */ - #else /* CONFIG_SYSVIPC */ #define INIT_IPC_NS(ns) #endif /* CONFIG_SYSVIPC */ Index: linux-2.6.24-mm1/ipc/ipcns_notifier.c =================================================================== --- linux-2.6.24-mm1.orig/ipc/ipcns_notifier.c 2008-02-08 13:59:26.000000000 +0100 +++ linux-2.6.24-mm1/ipc/ipcns_notifier.c 2008-02-08 14:36:05.000000000 +0100 @@ -29,6 +29,8 @@ static int ipcns_callback(struct notifie switch (action) { case IPCNS_MEMCHANGED: /* amount of lowmem has changed */ + case IPCNS_CREATED: + case IPCNS_REMOVED: /* * It's time to recompute msgmni */ Index: linux-2.6.24-mm1/ipc/Makefile =================================================================== --- linux-2.6.24-mm1.orig/ipc/Makefile 2008-02-08 08:10:13.000000000 +0100 +++ linux-2.6.24-mm1/ipc/Makefile 2008-02-08 14:36:52.000000000 +0100 @@ -3,8 +3,7 @@ # obj-$(CONFIG_SYSVIPC_COMPAT) += compat.o -obj_mem-$(CONFIG_MEMORY_HOTPLUG) += ipcns_notifier.o -obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o $(obj_mem-y) +obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o ipcns_notifier.o obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o obj_mq-$(CONFIG_COMPAT) += compat_mq.o obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y) Index: linux-2.6.24-mm1/ipc/namespace.c =================================================================== --- linux-2.6.24-mm1.orig/ipc/namespace.c 2008-02-08 08:18:35.000000000 +0100 +++ linux-2.6.24-mm1/ipc/namespace.c 2008-02-08 14:41:37.000000000 +0100 @@ -26,6 +26,12 @@ static struct ipc_namespace *clone_ipc_n msg_init_ns(ns); shm_init_ns(ns); + /* + * msgmni has already been computed for the new ipc ns. + * Thus, do the ipcns creation notification before registering that + * new ipcns in the chain. + */ + ipcns_notify(IPCNS_CREATED); register_ipcns_notifier(ns); kref_init(&ns->kref); @@ -97,4 +103,10 @@ void free_ipc_ns(struct kref *kref) shm_exit_ns(ns); kfree(ns); atomic_dec(&nr_ipc_ns); + + /* + * Do the ipcns removal notification after decrementing nr_ipc_ns in + * order to have a correct value when recomputing msgmni. + */ + ipcns_notify(IPCNS_REMOVED); } --
next prev parent reply other threads:[~2008-02-11 14:21 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-02-11 14:16 [PATCH 0/8] Change default MSGMNI tunable to scale with lowmem (v3) Nadia.Derbey 2008-02-11 14:16 ` [PATCH 1/8] Scaling msgmni to the amount of lowmem Nadia.Derbey 2008-02-16 5:59 ` Andrew Morton 2008-02-18 9:19 ` Nadia Derbey 2008-02-18 13:08 ` Nadia Derbey 2008-02-19 8:50 ` [LTP] " Subrata Modak 2008-02-19 17:16 ` Nadia Derbey 2008-02-19 22:16 ` Matt Helsley 2008-02-21 8:39 ` Nadia Derbey 2008-02-21 12:36 ` Nadia Derbey 2008-02-21 13:02 ` Nadia Derbey 2008-02-21 13:39 ` Subrata Modak 2008-02-22 6:25 ` Nadia Derbey 2008-02-22 8:41 ` Subrata Modak 2008-02-20 9:44 ` Subrata Modak 2008-04-29 20:28 ` Tony Luck 2008-05-05 8:45 ` Nadia Derbey 2008-05-06 16:42 ` Luck, Tony 2008-05-06 18:05 ` Serge E. Hallyn 2008-05-07 5:37 ` Nadia Derbey 2008-05-07 13:17 ` Serge E. Hallyn 2008-05-07 18:12 ` Matt Helsley 2008-05-07 5:13 ` Nadia Derbey 2008-02-11 14:16 ` [PATCH 2/8] Scaling msgmni to the number of ipc namespaces Nadia.Derbey 2008-02-11 14:16 ` [PATCH 3/8] Defining the slab_memory_callback priority as a constant Nadia.Derbey 2008-02-11 14:16 ` [PATCH 4/8] Recomputing msgmni on memory add / remove Nadia.Derbey 2008-02-11 14:16 ` [PATCH 5/8] Invoke the ipcns notifier chain as a work item Nadia.Derbey 2008-02-11 14:16 ` Nadia.Derbey [this message] 2008-02-11 14:16 ` [PATCH 7/8] Do not recompute msgmni anymore if explicitely set by user Nadia.Derbey 2008-02-11 20:24 ` Andrew Morton 2008-02-12 9:32 ` Nadia Derbey 2008-02-12 9:44 ` Andrew Morton 2008-02-12 15:15 ` Nadia Derbey 2008-02-12 19:44 ` Andrew Morton 2008-02-14 11:47 ` Nadia Derbey 2008-02-12 9:45 ` Nadia Derbey 2008-02-11 14:16 ` [PATCH 8/8] Re-enable msgmni automatic recomputing msgmni if set to negative Nadia.Derbey 2008-02-11 20:27 ` Andrew Morton 2008-02-12 11:38 ` Nadia Derbey
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