On 2024/2/23 11:02, Christoph Lameter (Ampere) wrote: > On Thu, 22 Feb 2024, Chengming Zhou wrote: > >> Anyway, I put the code below for discussion... > > Can we guestimate the free objects based on the number of partial slabs. That number is available. > Yeah, the number of partial slabs is easy to know, but I can't think of a way to estimate the free objects, since __slab_free() is just double cmpxchg in most cases. > How accurate need the accounting be? We also have fuzzy accounting in the VM counters. Maybe not need to be very accurate, some delay/fuzzy should be acceptable. Another direction I think is that we don't distinguish slabs on cpu partial list or slabs on node partial list anymore (different with current behavior). Now we have three scopes: 1. SL_ALL: include all slabs 2. SL_PARTIAL: only include partial slabs on node 3. SL_CPU: only include partail slabs on cpu and the using cpu slab If we change SL_PARTIAL to mean all partial slabs, it maybe simpler. Thanks.
