Modification History: *** NOTE *** DO NOT UPDATE THIS FILE. UPDATE package.xml INSTEAD. This file contains the CHANGELOG for the initial release. For subsequent releases, the CHANGLELOG is maintained in the package.xml file itself. Please edit package.xml instead. ************ 03/02/2008 kannan, checkin xhprof_html/ and xhprof_lib/ directories. cjiang [These contain PHP sources for the UI as well as various supporting libraries to compute "flat" info, diff reports, aggregate results of multiple runs, typeahead support, etc.] 02/20/2008 kannan add basic sanity tests for the extension 02/19/2008 kannan register constants for optional profiler flags; add xhprof.output_dir ini setting. 01/22/2008 ps port cpu affinity functions to FreeBSD 01/15/2008 kannan intercept builtins even if zend_execute_internal were null to begin with 01/14/2008 kannan track builtins by default; fix compiler warnings with fwd decls 12/22/2008 cjiang Further refactoring of the code for open sourcing: (1). Remove level 1 profiling mode. (2). Add xhprof_sample_enable, xhprof_sample_disable. (3). Unifiy function and global variable prefix. (4). Group relevant functions together. (5). Migrate change history to CHANAGELOG file. 12/19/2008 kannan First step refactoring for open sourcing: (1). Put basic direcotry structure (2). Rename extension and function names (3). Add LICENCE header. 06/17/2008 veeve use cycle_timer() for XHPROF_MODE_SAMPLED 03/27/2008 cjiang Add a 'hash-based' filter to reduce the number of expensive call-stack tranversal on recursion detection. 03/17/2008 kannan must not keep state on C stack to handle exit (which causes _zend_bailout to longjmp 02/25/2008 kannan add xhprof_flags to toggle various metric collections (buitins on/off, cpu metric on/off memory stats on/off) 02/14/2008 cjiang Use cycle_timer based on 'rdtsc' instruction on x86 machines to replace gettimeofday. rdtsc is extremely cheap compared with gettimeofday or getrusage. 12/06/2007 veeve bump version 1.1.2, added hp_global_t added mode callbacks, made modes extensible added sampler mode 12/05/2007 veeve added doc; house cleaning 11/28/2007 kannan split include accounting into load/run_init 11/09/2007 kannan memory usage profiling 10/27/2007 kannan handle recursive calls, "include" operations 10/20/2007 kannan add hierarchical profiling; incl vs. exclusive function times; browser based UI; diff and aggregation support 10/10/2007 hzhao creation (flat function profiles) Authors: Haiping Zhao hzhao@facebook.com Kannan Muthukkaruppan kannan@facebook.com Venkat Venkataramani veeve@facebook.com Changhao Jiang cjiang@facebook.com