[Bugs] [Bug 1724210] New: Incorrect power of two calculation in mem_pool_get_fn
bugzilla at redhat.com
bugzilla at redhat.com
Wed Jun 26 13:20:32 UTC 2019
https://bugzilla.redhat.com/show_bug.cgi?id=1724210
Bug ID: 1724210
Summary: Incorrect power of two calculation in mem_pool_get_fn
Product: GlusterFS
Version: 6
Status: NEW
Component: core
Assignee: bugs at gluster.org
Reporter: jahernan at redhat.com
CC: atumball at redhat.com, bugs at gluster.org,
nbalacha at redhat.com, rhinduja at redhat.com,
rhs-bugs at redhat.com, sankarshan at redhat.com,
storage-qa-internal at redhat.com
Depends On: 1722801, 1722802
Target Milestone: ---
Classification: Community
+++ This bug was initially created as a clone of Bug #1722802 +++
+++ This bug was initially created as a clone of Bug #1722801 +++
Description of problem:
The method used to calculate the power of two value for a type is off by 1
causing twice the required amount of memory to be allocated.
For example, cComparing the information for inode_t in statedumps from 3.4.4
and 3.5.0:
3.4.4:
------
pool-name=inode_t
active-count=15408
sizeof-type=168
padded-sizeof=256
size=3944448
shared-pool=0x7fac27a7b468
-----=-----
3.5.0:
------
pool-name=inode_t
active-count=2
sizeof-type=255 <--- actual sizeof inode_t is 168
padded-sizeof=512 <--- padded size is twice the required amount
size=1024
shared-pool=0x7f1103b5b6d0
Version-Release number of selected component (if applicable):
3.5.0
How reproducible:
Steps to Reproduce:
1. Create volume, fuse mount it and create some files and dirs on it
2. Take a statedump of the gluster mount process (kill -SIGUSR1 <pid>)
3. Compare the sizeof-type and padded-sizeof values in the state releases.
Actual results:
The padded-sizeof is twice the smallest power of two value for sizeof-type +
sizeof(obj header)
Expected results:
The padded-sizeof should be the smallest power of two value for sizeof-type +
sizeof(obj header)
Additional info:
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1722801
[Bug 1722801] Incorrect power of two calculation in mem_pool_get_fn
https://bugzilla.redhat.com/show_bug.cgi?id=1722802
[Bug 1722802] Incorrect power of two calculation in mem_pool_get_fn
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