On Thu, Apr 08, 2021 at 09:22:36PM +0800, Huang Ying wrote: > With NUMA balancing, in hint page fault handler, the faulting page > will be migrated to the accessing node if necessary. During the > migration, TLB will be shot down on all CPUs that the process has run > on recently. Because in the hint page fault handler, the PTE will be > made accessible before the migration is tried. The overhead of TLB > shooting down can be high, so it's better to be avoided if possible. > In fact, if we delay mapping the page until migration, that can be > avoided. This is what this patch doing. > <SNIP> > Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx> > Reviewed-by: Mel Gorman <mgorman@xxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Peter Xu <peterx@xxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Vlastimil Babka <vbabka@xxxxxxx> > Cc: "Matthew Wilcox" <willy@xxxxxxxxxxxxx> > Cc: Will Deacon <will@xxxxxxxxxx> > Cc: Michel Lespinasse <walken@xxxxxxxxxx> > Cc: Arjun Roy <arjunroy@xxxxxxxxxx> > Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Hi Andrew, I do not see this in the mmots tree. Was something missed in this patch that needs fixing or did it just fall through the cracks? Thanks. -- Mel Gorman SUSE Labs
