[PATCH 02/02]
Since all the namespaces see the same amount of memory (the total one)
this patch introduces a new variable that counts the ipc namespaces and divides
msg_ctlmni by this counter.
Signed-off-by: Nadia Derbey <[email protected]>
---
include/linux/ipc.h | 1 +
ipc/msg.c | 6 +++++-
ipc/util.c | 6 ++++++
3 files changed, 12 insertions(+), 1 deletion(-)
Index: linux-2.6.24-rc4/include/linux/ipc.h
===================================================================
--- linux-2.6.24-rc4.orig/include/linux/ipc.h 2007-12-11 11:57:53.000000000 +0100
+++ linux-2.6.24-rc4/include/linux/ipc.h 2007-12-11 12:34:53.000000000 +0100
@@ -121,6 +121,7 @@ struct ipc_namespace {
};
extern struct ipc_namespace init_ipc_ns;
+extern atomic_t nr_ipc_ns;
#ifdef CONFIG_SYSVIPC
#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
Index: linux-2.6.24-rc4/ipc/util.c
===================================================================
--- linux-2.6.24-rc4.orig/ipc/util.c 2007-12-11 11:57:58.000000000 +0100
+++ linux-2.6.24-rc4/ipc/util.c 2007-12-11 12:36:32.000000000 +0100
@@ -51,6 +51,8 @@ struct ipc_namespace init_ipc_ns = {
},
};
+atomic_t nr_ipc_ns = ATOMIC_INIT(1);
+
static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
{
int err;
@@ -61,6 +63,8 @@ static struct ipc_namespace *clone_ipc_n
if (ns == NULL)
goto err_mem;
+ atomic_inc(&nr_ipc_ns);
+
err = sem_init_ns(ns);
if (err)
goto err_sem;
@@ -80,6 +84,7 @@ err_msg:
sem_exit_ns(ns);
err_sem:
kfree(ns);
+ atomic_dec(&nr_ipc_ns);
err_mem:
return ERR_PTR(err);
}
@@ -109,6 +114,7 @@ void free_ipc_ns(struct kref *kref)
msg_exit_ns(ns);
shm_exit_ns(ns);
kfree(ns);
+ atomic_dec(&nr_ipc_ns);
}
/**
Index: linux-2.6.24-rc4/ipc/msg.c
===================================================================
--- linux-2.6.24-rc4.orig/ipc/msg.c 2007-12-11 12:12:32.000000000 +0100
+++ linux-2.6.24-rc4/ipc/msg.c 2007-12-11 14:20:28.000000000 +0100
@@ -84,6 +84,7 @@ static void __msg_init_ns(struct ipc_nam
{
struct sysinfo i;
unsigned long allowed;
+ int nb_ns;
ns->ids[IPC_MSG_IDS] = ids;
ns->msg_ctlmax = MSGMAX;
@@ -95,10 +96,13 @@ static void __msg_init_ns(struct ipc_nam
* up to 8MB : msgmni = 16 (MSGMNI)
* 4 GB : msgmni = 8K
* more than 16 GB : msgmni = 32K (IPCMNI)
+ * Also take into account the number of nsproxies created so far.
*/
si_meminfo(&i);
allowed = ((i.totalram / MSG_MEM_SCALE) * i.mem_unit) / MSGMNB;
- ns->msg_ctlmni = min((unsigned long) IPCMNI,
+ nb_ns = atomic_read(&nr_ipc_ns);
+ allowed /= nb_ns;
+ ns->msg_ctlmni = min((unsigned long) (IPCMNI / nb_ns),
max((unsigned long) MSGMNI, allowed));
atomic_set(&ns->msg_bytes, 0);
--
--
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