linux/net/ceph
Ilya Dryomov 958a27658d crush: straw2 bucket type with an efficient 64-bit crush_ln()
This is an improved straw bucket that correctly avoids any data movement
between items A and B when neither A nor B's weights are changed.  Said
differently, if we adjust the weight of item C (including adding it anew
or removing it completely), we will only see inputs move to or from C,
never between other items in the bucket.

Notably, there is not intermediate scaling factor that needs to be
calculated.  The mapping function is a simple function of the item weights.

The below commits were squashed together into this one (mostly to avoid
adding and then yanking a ~6000 lines worth of crush_ln_table):

- crush: add a straw2 bucket type
- crush: add crush_ln to calculate nature log efficently
- crush: improve straw2 adjustment slightly
- crush: change crush_ln to provide 32 more digits
- crush: fix crush_get_bucket_item_weight and bucket destroy for straw2
- crush/mapper: fix divide-by-0 in straw2
  (with div64_s64() for draw = ln / w and INT64_MIN -> S64_MIN - need
   to create a proper compat.h in ceph.git)

Reflects ceph.git commits 242293c908e923d474910f2b8203fa3b41eb5a53,
                          32a1ead92efcd351822d22a5fc37d159c65c1338,
                          6289912418c4a3597a11778bcf29ed5415117ad9,
                          35fcb04e2945717cf5cfe150b9fa89cb3d2303a1,
                          6445d9ee7290938de1e4ee9563912a6ab6d8ee5f,
                          b5921d55d16796e12d66ad2c4add7305f9ce2353.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2015-04-22 18:33:43 +03:00
..
crush crush: straw2 bucket type with an efficient 64-bit crush_ln() 2015-04-22 18:33:43 +03:00
armor.c
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, ceph: split ceph_show_options() 2015-04-20 18:55:38 +03:00
ceph_fs.c
ceph_hash.c
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: expose client options through debugfs 2015-04-20 18:55:39 +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 libceph: don't overwrite specific con error msgs 2015-04-20 18:55:37 +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 crush: straw2 bucket type with an efficient 64-bit crush_ln() 2015-04-22 18:33:43 +03:00
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