Ilya Dryomov 74a5293832 crush: don't normalize input of crush_ln iteratively ...

Use __builtin_clz() supported by GCC and Clang to figure out
how many bits we should shift instead of shifting by a bit
in a loop until the value gets normalized. Improves performance
of this function by up to 3x in worst-case scenario and overall
straw2 performance by ~10%.

Reflects ceph.git commit 110de33ca497d94fc4737e5154d3fe781fa84a0a.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

2016-10-05 23:02:04 +02:00

..

crush_ln_table.h

crush: sync up with userspace

2015-06-25 11:49:31 +03:00

crush.c

crush: sync up with userspace

2015-06-25 11:49:31 +03:00

hash.c

crush: sync up with userspace

2015-06-25 11:49:31 +03:00

mapper.c

crush: don't normalize input of crush_ln iteratively

2016-10-05 23:02:04 +02:00