ipc: account for kmem usage on mqueue and msg

When kmem accounting switched from account by default to only account if
flagged by __GFP_ACCOUNT, IPC mqueue and messages was left out.

The production use case at hand is that mqueues should be customizable
via sysctls in Docker containers in a Kubernetes cluster.  This can only
be safely allowed to the users of the cluster (without the risk that
they can cause resource shortage on a node, influencing other users'
containers) if all resources they control are bounded, i.e.  accounted
for.

Link: http://lkml.kernel.org/r/1476806075-1210-1-git-send-email-arozansk@redhat.com
Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
Reported-by: Stefan Schimanski <sttts@redhat.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Stefan Schimanski <sttts@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index a521999de4f103954e40db932e8903f3ed7e48f1..bf74eaa5c39f208ea5f1ee41db38e57349512e7d 100644 (file)
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -53,7 +53,7 @@ static struct msg_msg *alloc_msg(size_t len)
        size_t alen;
 
        alen = min(len, DATALEN_MSG);
-       msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
+       msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL_ACCOUNT);
        if (msg == NULL)
                return NULL;
 
@@ -65,7 +65,7 @@ static struct msg_msg *alloc_msg(size_t len)
        while (len > 0) {
                struct msg_msgseg *seg;
                alen = min(len, DATALEN_SEG);
-               seg = kmalloc(sizeof(*seg) + alen, GFP_KERNEL);
+               seg = kmalloc(sizeof(*seg) + alen, GFP_KERNEL_ACCOUNT);
                if (seg == NULL)
                        goto out_err;
                *pseg = seg;