These changes can improve performance if your servers are IO bound and have many disks. They are more likely to be an issue if you use O_DIRECT for InnoDB or a remote file system such as NFS.
The 5.1 branch in launchpad has these patches:
show_patches.patch SHOW PATCHES 1.0 Jeremy Cole N/A innodb_io_threads.patch INNODB IO THREADS 1.0 mcallaghan@google.com GPL More background IO threads innodb_fast_mutex.patch INNODB FAST MUTEX 1.0 benhandy@google.com GPL Faster Innodb mutex innodb_io_capacity.patch INNODB IO CAPACITY 1.0 mcallaghan@google.com GPL Background IO rate limits show_global_mutex_stats.patch SHOW GLOBAL MUTEX STATUS 1.0 mcallaghan@google.com GPL Displays mutex contention statistics
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