Red Hat Bugzilla – Bug 428291
GFS2: Reduce gfs2 memory requirements
Last modified: 2008-05-21 11:06:08 EDT
Description of problem:
GFS2 uses too much memory. For every buffer, gfs2 has a special
lock structure called a glock, due to the type of page-level locking
it does. Right now, GFS2 allocates an inode structure to keep track
of the address space associated with metadata. We need to reduce the
memory requirements. We can do this by making it only allocate the
address space inode when it's needed, on the fly. That reduces the
size of each glock considerably.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Run any program that does a lot of writing
Lots of memory allocated per page.
Less memory allocated.
There is an upstream patch to do this that needs to be crosswritten
Created attachment 291295 [details]
Patch to fix the problem
Here is the patch I'll be posting to rhkernel-list.
Patch compiled and tested on "kool", and posted to rhkernel-list.
Setting status to modified and rerouting to Don Zickus.
You can download this test kernel from http://people.redhat.com/dzickus/el5
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.