SLAB for IDL stack allocation (ITS#2183)

[jongchoi@us.ibm.com]

Full_Name: Jong Hyuk Choi
Version: All
OS: RH 7.3
URL: ftp://ftp.openldap.org/incoming/jongchoi-SLAB-021115.diff
Submission from: (NULL) (198.81.209.17)


Also through profiling, the source of performance discrepancy between IDL
caching
and candidate caching was identified as the memory allocation of IDL stack in
search_candidates().
Therefore, I also designed a simple slab allocator for the IDL stack
allocation.
Pleaes refer to ITS# 2182 for more detail.
Comments are more than welcome.
- Jong

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Jong Hyuk Choi, Ph. D
Enterprise Linux Group
IBM Thomas J. Watson Research Center
jongchoi@us.ibm.com  jongchoi@OpenLDAP.org