Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics

2017-08-25 Thread Jesper Dangaard Brouer
On Fri, 25 Aug 2017 09:04:37 +0100 Mel Gorman wrote: > On Thu, Aug 24, 2017 at 05:59:58PM +0800, Kemi Wang wrote: > > Each page allocation updates a set of per-zone statistics with a call to > > zone_statistics(). As discussed in 2017 MM summit, these are a substantial > > source of overhead in t

Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics

2017-08-25 Thread Mel Gorman
On Thu, Aug 24, 2017 at 05:59:58PM +0800, Kemi Wang wrote: > Each page allocation updates a set of per-zone statistics with a call to > zone_statistics(). As discussed in 2017 MM summit, these are a substantial > source of overhead in the page allocator and are very rarely consumed. This > signific

[PATCH v2 0/3] Separate NUMA statistics from zone statistics

2017-08-24 Thread Kemi Wang
Each page allocation updates a set of per-zone statistics with a call to zone_statistics(). As discussed in 2017 MM summit, these are a substantial source of overhead in the page allocator and are very rarely consumed. This significant overhead in cache bouncing caused by zone counters (NUMA associ