On Tue, Oct 19, 2010 at 9:57 AM, KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> wrote: >> > I think there are two bugs here. >> > The raid1 bug that Torsten mentions is certainly real (and has been around >> > for an embarrassingly long time). >> > The bug that I identified in too_many_isolated is also a real bug and can be >> > triggered without md/raid1 in the mix. >> > So this is not a 'full fix' for every bug in the kernel :-), but it could >> > well be a full fix for this particular bug. >> > >> >> Can we just delete the too_many_isolated() logic? (Crappy comment >> describes what the code does but not why it does it). > > if my remember is correct, we got bug report that LTP may makes misterious > OOM killer invocation about 1-2 years ago. because, if too many parocess are in > reclaim path, all of reclaimable pages can be isolated and last reclaimer found > the system don't have any reclaimable pages and lead to invoke OOM killer