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| author | Pierre Peiffer <pierre.peiffer@bull.net> | 2008-02-08 04:18:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:26 -0800 |
| commit | ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c (patch) | |
| tree | de6d6828c03f98be6fc41e8acf3b3e52df28be9b /ipc/util.c | |
| parent | 4b9fcb0ec60584d639ad105c42b75a3447071e47 (diff) | |
| download | linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.tar.gz linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.tar.bz2 linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.zip | |
IPC: make struct ipc_ids static in ipc_namespace
Each ipc_namespace contains a table of 3 pointers to struct ipc_ids (3 for
msg, sem and shm, structure used to store all ipcs) These 'struct ipc_ids'
are dynamically allocated for each icp_namespace as the ipc_namespace
itself (for the init namespace, they are initialized with pointers to
static variables instead)
It is so for historical reason: in fact, before the use of idr to store the
ipcs, the ipcs were stored in tables of variable length, depending of the
maximum number of ipc allowed. Now, these 'struct ipc_ids' have a fixed
size. As they are allocated in any cases for each new ipc_namespace, there
is no gain of memory in having them allocated separately of the struct
ipc_namespace.
This patch proposes to make this table static in the struct ipc_namespace.
Thus, we can allocate all in once and get rid of all the code needed to
allocate and free these ipc_ids separately.
Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Acked-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/util.c')
| -rw-r--r-- | ipc/util.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/ipc/util.c b/ipc/util.c index 910db774819..fd1b50da9db 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -833,7 +833,7 @@ static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos) if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); - return sysvipc_find_ipc(iter->ns->ids[iface->ids], *pos, pos); + return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos); } /* @@ -846,7 +846,7 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos) struct ipc_proc_iface *iface = iter->iface; struct ipc_ids *ids; - ids = iter->ns->ids[iface->ids]; + ids = &iter->ns->ids[iface->ids]; /* * Take the lock - this will be released by the corresponding @@ -877,7 +877,7 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it) if (ipc && ipc != SEQ_START_TOKEN) ipc_unlock(ipc); - ids = iter->ns->ids[iface->ids]; + ids = &iter->ns->ids[iface->ids]; /* Release the lock we took in start() */ up_read(&ids->rw_mutex); } |