On Tue, Oct 9, 2018 at 4:16 AM Michal Hocko <mhocko@xxxxxxxxxx> wrote: > > On Thu 04-10-18 09:51:37, Dan Williams wrote: > > On Thu, Oct 4, 2018 at 12:48 AM Michal Hocko <mhocko@xxxxxxxxxx> wrote: [..] > > So the reason front-back randomization is not enough is due to the > > in-order initial freeing of pages. At the start of that process > > putting page1 in front or behind page0 still keeps them close > > together, page2 is still near page1 and has a high chance of being > > adjacent. As more pages are added ordering diversity improves, but > > there is still high page locality for the low address pages and this > > leads to no significant impact to the cache conflict rate. Patch3 is > > enough to keep the entropy sustained over time, but it's not enough > > initially. > > That should be in the changelog IMHO. Fair enough, I'll fold that in when I rebase on top of -next.
