On Thu, Oct 28, 2021 at 04:33:27PM +0200, Sebastian Andrzej Siewior wrote: > TRANSPARENT_HUGEPAGE: > There are potential non-deterministic delays to an RT thread if a critical > memory region is not THP-aligned and a non-RT buffer is located in the same > hugepage-aligned region. It's also possible for an unrelated thread to migrate > pages belonging to an RT task incurring unexpected page faults due to memory > defragmentation even if khugepaged is disabled. > > Regular HUGEPAGEs are not affected by this can be used. > > NUMA_BALANCING: > There is a non-deterministic delay to mark PTEs PROT_NONE to gather NUMA fault > samples, increased page faults of regions even if mlocked and non-deterministic > delays when migrating pages. > > [Mel Gorman worded 99% of the commit description]. > > Link: https://lore.kernel.org/all/20200304091159.GN3818@xxxxxxxxxxxxxxxxxxx/ > Link: https://lore.kernel.org/all/20211026165100.ahz5bkx44lrrw5pt@xxxxxxxxxxxxx/ > Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> -- Mel Gorman SUSE Labs
