On Sun, Nov 25, 2012 at 04:47:15PM +0800, Hillf Danton wrote: > On 11/24/12, Mel Gorman <mgor...@suse.de> wrote: > > Warning: This is an insanely long mail and there a lot of data here. Get > > coffee or something. > > > > This is another round of comparisons between the latest released versions > > of each of three automatic numa balancing trees that are out there. > > > > From the series "Automatic NUMA Balancing V5", the kernels tested were > > > > stats-v5r1 Patches 1-10. TLB optimisations, migration stats > > thpmigrate-v5r1 Patches 1-37. Basic placement policy, PMD handling, THP > > migration etc. > > adaptscan-v5r1 Patches 1-38. Heavy handed PTE scan reduction > > delaystart-v5r1 Patches 1-40. Delay the PTE scan until running on a new > > node > > > > If I just say balancenuma, I mean the "delaystart-v5r1" kernel. The other > > kernels are included so you can see the impact the scan rate adaption > > patch has and what that might mean for a placement policy using a proper > > feedback mechanism. > > > > The other two kernels were > > > > numacore-20121123 It was no longer clear what the deltas between releases > > and > > the dependencies might be so I just pulled tip/master on November > > 23rd, 2012. An earlier pull had serious difficulties and the patch > > responsible has been dropped since. This is not a like-with-like > > comparison as the tree contains numerous other patches but it's > > the best available given the timeframe > > > > autonuma-v28fast This is a rebased version of Andrea's autonuma-v28fast > > branch with Hugh's THP migration patch on top. > > FYI, based on how target huge page is selected, > > + > + new_page = alloc_pages_node(numa_node_id(), > + (GFP_TRANSHUGE | GFP_THISNODE) & ~__GFP_WAIT, HPAGE_PMD_ORDER); > > the thp replacement policy is changed to be MORON, >
That is likely true. When rebasing a policy on top of balancenuma it is important to keep an eye on what node is used for target migration and what node is passed to task_numa_fault() and confirm this is the node the policy expects. -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
