On Fri, Oct 19, 2018 at 04:33:03AM +0000, Wei Yang wrote: > node > Reply-To: Wei Yang <richard.weiyang@xxxxxxxxx> > > Masters, > > During the code reading, I pop up this idea. > > In case we put some intelegence of NUMA node to pcp->lists[], we may > get a better performance. > Why? > The idea is simple: > > Put page on other nodes to the tail of pcp->lists[], because we > allocate from head and free from tail. > Pages from remote nodes are not placed on local lists. Even in the slab context, such objects are placed on alien caches which have special handling. > Since my desktop just has one numa node, I couldn't test the effect. I suspect it would eventually cause a crash or at least weirdness as the page zone ids would not match due to different nodes. > Sorry for sending this without a real justification. Hope this will not > make you uncomfortable. I would be very glad if you suggest some > verifications that I could do. > > Below is my testing patch, look forward your comments. > I commend you trying to understand how the page allocator works but I suggest you take a step back, pick a workload that is of interest and profile it to see where hot spots are that may pinpoint where an improvement can be made. -- Mel Gorman SUSE Labs
