On Tue 06-07-21 13:26:53, Andrew Morton wrote: > On Mon, 5 Jul 2021 19:05:36 +0200 "Uladzislau Rezki (Sony)" <urezki@xxxxxxxxx> wrote: > > > In case of simultaneous vmalloc allocations, for example it is 1GB and > > 12 CPUs my system is able to hit "BUG: soft lockup" for !CONFIG_PREEMPT > > kernel. > > > > <snip> > > ... > > > > are obtained, i.e. do batched page requests adding cond_resched() meanwhile > > to reschedule. Batched value is hard-coded and is 100 pages per call. > > > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx> > > Can we please have a Fixes: for this? Is this a fix for any actual real life problem? I mean allocating 1GB of vmalloc space back and forth sounds like a stretch to me. > Is this fix important enough for 4.14-rcx? I think so... I do not think so. This is an improvement so that vmalloc behaves more sanely for those abusers... -- Michal Hocko SUSE Labs
