On Thu, Apr 01, 2021 at 11:32:25AM -0700, Dave Hansen wrote: > > From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > > This is mostly derived from a patch from Yang Shi: > > https://lore.kernel.org/linux-mm/1560468577-101178-10-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx/ > > Add code to the reclaim path (shrink_page_list()) to "demote" data > to another NUMA node instead of discarding the data. This always > avoids the cost of I/O needed to read the page back in and sometimes > avoids the writeout cost when the pagee is dirty. > > A second pass through shrink_page_list() will be made if any demotions > fail. This essentally falls back to normal reclaim behavior in the > case that demotions fail. Previous versions of this patch may have > simply failed to reclaim pages which were eligible for demotion but > were unable to be demoted in practice. > > Note: This just adds the start of infratructure for migration. It is > actually disabled next to the FIXME in migrate_demote_page_ok(). > > Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > Cc: Wei Xu <weixugc@xxxxxxxxxx> > Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> > Cc: David Rientjes <rientjes@xxxxxxxxxx> > Cc: Huang Ying <ying.huang@xxxxxxxxx> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Cc: osalvador <osalvador@xxxxxxx> Reviewed-by: Oscar Salvador <osalvador@xxxxxxx> -- Oscar Salvador SUSE L3
