On Fri, May 19, 2017 at 10:06:01AM +0300, Konstantin Khlebnikov wrote: > Currently this counter shown in /proc/lockdep if CONFIG_DEBUG_LOCKDEP=y > This patch disables it completely if this option is disabled. > > This counter might be useful for debugging lockdep itself, but for normal > debugging it seems useless. Lockstat provides more detailed statistics. > > This atomic_inc is a hot spot inside __lock_acquire() for debug kernel. > > With patch "netperf -H localhost" shows some boost: 2500 -> 2600
Nothing against these patches, but I do wonder why you're performance optimizing debug kernels ;-)
