The following series optimizes the way PCRE2 matches are done by using more efficiently the match_data resources and shows over 30% reduction in cpu utilization while only using 1/5 of the memory as shown in the bug report[1] that started it all. The first patch is just an administrative change that I found useful while building and testing the code with a development version of PCRE2. The second patch reverts the workaround merged in 30b3e9d2 (libselinux: Workaround for heap overhead of pcre, 2023-01-12) while addressing the increased memory utilization that it was trying to prevent by changing the way the match_data required for each match was being handled. The last patch changes the single threaded codepath to allow for a similar performance improvement done to the multithreaded codepath by intentionally leaking one match_data that could be reused for all matches. Carlo Marcelo Arenas Belón (3): scripts: respect an initial LD_LIBRARY_PATH with env_use_destdir libselinux: improve performance with pcre matches libselinux: use a static match_data if single threaded libselinux/src/regex.c | 111 +++++++++++++++++------------- libselinux/src/selinux_internal.h | 4 ++ scripts/env_use_destdir | 8 ++- 3 files changed, 73 insertions(+), 50 deletions(-) [1] https://github.com/PCRE2Project/pcre2/issues/194 -- 2.39.0
