On 1/22/21 1:48 AM, Roman Gushchin wrote: > On Thu, Jan 21, 2021 at 06:21:54PM +0100, Vlastimil Babka wrote: > > Hi Vlastimil! > > This makes a lot of sense, however it looks a bit as an overkill to me (on 5.9+). > Isn't limiting a number of pages (instead of number of objects) sufficient on 5.9+? It would help, but fundamentally there can still be a lot of memory locked up with e.g. many CPU's. We should have a way to flush this automatically, like for other cached things. > If not, maybe we can limit the shrinking to the pre-OOM condition? > Do we really need to trip it constantly? The priority could be reduced, pre-OOM might be too extreme. Why reclaim e.g. actually used LRU pages instead of unused slab pages? IMHO a frequently reclaiming system probably doesn't benefit from SLUB's peak performance at that point anyway... > Thanks! >
