On Thu 14-01-21 10:27:40, Vlastimil Babka wrote: > On 1/12/21 5:35 PM, Christoph Lameter wrote: > > On Tue, 12 Jan 2021, Jann Horn wrote: > > > >> [This is not something I intend to work on myself. But since I > >> stumbled over this issue, I figured I should at least document/report > >> it, in case anyone is willing to pick it up.] > > > > Well yeah all true. There is however a slabinfo tool that has an -s option > > to shrink all slabs. > > > > slabinfo -s > > > > So you could put that somewhere that executes if the system is > > idle or put it into cron or so. > > Hm this would be similar to recommending a periodical echo > drop_caches > operation. We actually discourage from that (and yeah, some tools do that, and > we now report those in dmesg). I believe the kernel should respond to memory > pressure and not OOM prematurely by itself, including SLUB. Absolutely agreed! Partial caches are a very deep internal implementation detail of the allocator and admin has no bussiness into fiddling with that. This would only lead to more harm than good. Comparision to drop_caches is really exact! -- Michal Hocko SUSE Labs
