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| author | Nadia Derbey <Nadia.Derbey@bull.net> | 2008-04-29 01:00:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:12 -0700 |
| commit | 4d89dc6ab2711258bfd12c72d753f3ad56b244e2 (patch) | |
| tree | a971c08eab247a7d69ae5fe54c4e0bdfef5d29ba /ipc/msg.c | |
| parent | f7bf3df8be72d98afa84f5ff183e14c1ba1e560d (diff) | |
| download | linux-3.10-4d89dc6ab2711258bfd12c72d753f3ad56b244e2.tar.gz linux-3.10-4d89dc6ab2711258bfd12c72d753f3ad56b244e2.tar.bz2 linux-3.10-4d89dc6ab2711258bfd12c72d753f3ad56b244e2.zip | |
ipc: scale msgmni to the number of ipc namespaces
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 <Nadia.Derbey@bull.net>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Mingming Cao <cmm@us.ibm.com>
Cc: Pierre Peiffer <pierre.peiffer@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/msg.c')
| -rw-r--r-- | ipc/msg.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 9e7211122e2..be8449d48a8 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -81,24 +81,28 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it); /* * Scale msgmni with the available lowmem size: the memory dedicated to msg * queues should occupy at most 1/MSG_MEM_SCALE of lowmem. - * This should be done staying within the (MSGMNI , IPCMNI) range. + * Also take into account the number of nsproxies created so far. + * This should be done staying within the (MSGMNI , IPCMNI/nr_ipc_ns) range. */ static 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; goto out_callback; } - if (allowed > IPCMNI) { - ns->msg_ctlmni = IPCMNI; + if (allowed > IPCMNI / nb_ns) { + ns->msg_ctlmni = IPCMNI / nb_ns; goto out_callback; } |