Just short message that patch enables microsecond resolution in slow-log (see more https://www.percona.com/blog/2006/09/06/slow-query-log-analyzes-tools/) for 5.0.37 is available here:
www.percona.com/blog/files/patches/patch.slow-micro.5.0.37.diff
The patch for 5.0.41 :
www.percona.com/blog/files/patches/patch.slow-micro.5.0.41.diff
About the Author
Vadim TkachenkoVadim Tkachenko co-founded Percona in 2006 and serves as its Chief Technology Officer. Vadim leads Percona Labs, which focuses on technology research and performance evaluations of Percona’s and third-party products. Vadim’s expertise in LAMP performance and multi-threaded programming help optimize MySQL and InnoDB internals to take full advantage of modern hardware. He also co-authored the book High Performance MySQL: Optimization, Backups, and Replication 3rd Edition.
The 5.0.41 patch seems to be a copy of the 5.0.37 patch!? I see no difference and it sais
diff -ur mysql-5.0.37/include/my_time.h mysql-5.0.37-microslow/include/my_time.h