linux/net/ceph
Ilya Dryomov 6d7fdb0ab3 Revert "libceph: use memalloc flags for net IO"
This reverts commit 89baaa570a.

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>
Cc: stable@vger.kernel.org # 3.18+, needs backporting
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Acked-by: Mel Gorman <mgorman@suse.de>
2015-04-07 19:08:35 +03:00
..
crush crush: add SET_CHOOSELEAF_VARY_R step 2014-04-04 21:07:28 -07:00
armor.c libceph: Fix base64-decoding when input ends in newline. 2011-03-15 09:14:02 -07:00
auth_none.c libceph: Fix NULL pointer dereference in auth client code 2013-07-03 15:32:55 -07:00
auth_none.h net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
auth_x_protocol.h
auth_x.c libceph: fix sparse endianness warnings 2015-01-08 20:36:57 +03:00
auth_x.h libceph: store session key in cephx authorizer 2014-12-17 20:09:50 +03:00
auth.c libceph: wrap auth methods in a mutex 2013-05-01 21:17:15 -07:00
buffer.c libceph: nuke ceph_kvfree() 2014-12-17 20:09:50 +03:00
ceph_common.c libceph: tcp_nodelay support 2015-02-19 13:31:40 +03:00
ceph_fs.c ceph: fix file mode calculation 2011-07-19 11:25:04 -07:00
ceph_hash.c net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
ceph_strings.c libceph: nuke pool op infrastructure 2015-02-19 13:31:37 +03:00
crypto.c libceph: do not crash on large auth tickets 2014-11-13 22:21:12 +03:00
crypto.h net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
debugfs.c libceph: nuke pool op infrastructure 2015-02-19 13:31:37 +03:00
Kconfig libceph: select CRYPTO_CBC in addition to CRYPTO_AES 2014-10-14 21:03:20 +04:00
Makefile libceph: create source file "net/ceph/snapshot.c" 2013-05-01 21:20:08 -07:00
messenger.c Revert "libceph: use memalloc flags for net IO" 2015-04-07 19:08:35 +03:00
mon_client.c libceph: use mon_client.c/put_generic_request() more 2015-02-19 13:31:37 +03:00
msgpool.c libceph: initialize msgpool message types 2012-07-30 09:29:50 -07:00
osd_client.c libceph: kfree() in put_osd() shouldn't depend on authorizer 2015-02-19 14:27:51 +03:00
osdmap.c libceph: Convert pr_warning to pr_warn 2014-10-14 21:03:23 +04:00
pagelist.c libceph: reference counting pagelist 2014-10-14 12:56:48 -07:00
pagevec.c mm: gup: use get_user_pages_unlocked 2015-02-11 17:06:05 -08:00
snapshot.c libceph: create source file "net/ceph/snapshot.c" 2013-05-01 21:20:08 -07:00