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os/bluestore/AvlAllocator: use cbit for counting the order of alignment

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no need to calculate the alignment first, cbits() would suffice. as it
counts the first set bit and the follow 0's in a number. the result
is identical to the cbit(alignment of that number).

Signed-off-by: Kefu Chai <kchai@redhat.com>
This commit is contained in:
Kefu Chai 2021-06-02 16:31:18 +08:00
parent 9b52ba1dd0
commit 573cbb796e
1 changed files with 1 additions and 4 deletions
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5
src/os/bluestore/AvlAllocator.cc
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@ -266,10 +266,7 @@ int AvlAllocator::_allocate(
* not guarantee that other allocations sizes may exist in the same
* region.
*/
uint64_t align = size & -size;
ceph_assert(align != 0);
uint64_t* cursor = &lbas[cbits(align) - 1];
uint64_t* cursor = &lbas[cbits(size) - 1];
start = _pick_block_after(cursor, size, unit);
dout(20) << __func__ << " first fit=" << start << " size=" << size << dendl;
if (start != uint64_t(-1ULL)) {