On Fri, Dec 30, 2016 at 01:56:16PM +0100, Michal Hocko wrote: > On Fri 30-12-16 12:36:20, Mel Gorman wrote: > [...] > > I'll neither ack nor nak this patch. However, I would much prefer an > > additional option be added to sysfs called defer-fault that would avoid > > all fault-based stalls but still potentially stall for MADV_HUGEPAGE. > > Would you consider changing the semantic of defer=madvise to invoke > KSWAPD for !madvised vmas as acceptable. It would be a change in > semantic but I am wondering what would be a risk and potential > regression space. >
I'd worry a little, but not a lot. The concern would be that kswapd waking up would reclaim pages and cause major faults that would have remained resident with the current semantics. -- Mel Gorman SUSE Labs
