On Fri, Jul 06, 2018 at 03:32:45PM -0400, Waiman Long wrote: > With a 4.18 based kernel, the positive & negative dentries lookup rates > (lookups per second) after initial boot on a 2-socket 24-core 48-thread > 64GB memory system with and without the patch were as follows: ` > > Metric w/o patch neg_dentry_pc=0 neg_dentry_pc=1 > ------ --------- --------------- --------------- > Positive dentry lookup 584299 586749 582670 > Negative dentry lookup 1422204 1439994 1438440 > Negative dentry creation 643535 652194 641841 > > For the lookup rate, there isn't any signifcant difference with or > without the patch or with a zero or non-zero value of neg_dentry_pc. Sigh... What I *still* don't see (after all the iterations of the patchset) is any performance data on workloads that would be likely to feel the impact. Anything that seriously hits INCLUDE_PATH, for starters...
