On Fri, Jan 11, 2019 at 02:59:38PM +0100, Michal Hocko wrote: > On Fri 11-01-19 16:52:17, Baptiste Lepers wrote: > > Hello, > > > > We have a performance issue with the page cache. One of our workload > > spends more than 50% of it's time in the lru_locks called by > > shrink_inactive_list in mm/vmscan.c. > > Who does contend on the lock? Are there direct reclaimers or is it > solely kswapd with paths that are faulting the new page cache in? Yes, and could you please post your performance data showing the time in lru_lock? Whatever you have is fine, but using perf with -g would give callstacks and help answer Michal's question about who's contending. Happy to help profile and debug offline.
