Revert "libceph: use memalloc flags for net IO"

commit 6d7fdb0ab351b33d4c12d53fe44be030b90fc9d4 upstream.

This reverts commit 89baaa570ab0b476db09408d209578cfed700e9f.

Dirty page throttling should be sufficient for us in the general case
so there is no need to use __GFP_MEMALLOC - it would be needed only in
the swap-over-rbd case, which we currently don't support.  (It would
probably take approximately the commit that is being reverted to add
that support, but we would also need the "swap" option to distinguish
from the general case and make sure swap ceph_client-s aren't shared
with anything else.)  See ceph-devel threads [1] and [2] for the
details of why enabling pfmemalloc reserves for all cases is a bad
thing.

On top of potential system lockups related to drained emergency
reserves, this turned out to cause ceph lockups in case peers are on
the same host and communicating via loopback due to sk_filter()
dropping pfmemalloc skbs on the receiving side because the receiving
loopback socket is not tagged with SOCK_MEMALLOC.

[1] "SOCK_MEMALLOC vs loopback"
    http://www.spinics.net/lists/ceph-devel/msg22998.html
[2] "[PATCH] libceph: don't set memalloc flags in loopback case"
    http://www.spinics.net/lists/ceph-devel/msg23392.html

Conflicts:
	net/ceph/messenger.c [ context: tcp_nodelay option ]

Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Sage Weil <sage@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 33a2f201e460e1585f82db94c8f3f90f01bbacdf..74d30ec7b234d728c67dd9973d7b715ece9a2c75 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -484,7 +484,7 @@ static int ceph_tcp_connect(struct ceph_connection *con)
                               IPPROTO_TCP, &sock);
        if (ret)
                return ret;
-       sock->sk->sk_allocation = GFP_NOFS | __GFP_MEMALLOC;
+       sock->sk->sk_allocation = GFP_NOFS;
 
 #ifdef CONFIG_LOCKDEP
        lockdep_set_class(&sock->sk->sk_lock, &socket_class);
@@ -510,8 +510,6 @@ static int ceph_tcp_connect(struct ceph_connection *con)
                return ret;
        }
 
-       sk_set_memalloc(sock->sk);
-
        con->sock = sock;
        return 0;
 }
@@ -2798,11 +2796,8 @@ static void con_work(struct work_struct *work)
 {
        struct ceph_connection *con = container_of(work, struct ceph_connection,
                                                   work.work);
-       unsigned long pflags = current->flags;
        bool fault;
 
-       current->flags |= PF_MEMALLOC;
-
        mutex_lock(&con->mutex);
        while (true) {
                int ret;
@@ -2856,8 +2851,6 @@ static void con_work(struct work_struct *work)
                con_fault_finish(con);
 
        con->ops->put(con);
-
-       tsk_restore_flags(current, pflags, PF_MEMALLOC);
 }
 
 /*