On Wed, Nov 17, 2021 at 05:38:28PM +0800, Gang Li wrote: > On 11/17/21 4:29 PM, Mel Gorman wrote: > > > > It's a bit vague but if you wanted to put together the outline, I'd read > > over it. Note that this was all in the context of trying to introduce an > > Sorry, maybe I shouldn't propose new feature in this context. > > > API like > > > > Disable/enable per-process numa balancing: > > prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING, 0/1); > > > > i.e. one that controlled both enabling and disabling. You also have > > the option of introducing the NUMAB equivalent of PR_SET_THP_DISABLE -- > > an API that is explicitly about disabling *only*. > > > > If those APIs are ok with you, I will send v2 soon. > > 1. prctl(PR_NUMA_BALANCING, PR_SET_THP_DISABLE); It would be (PR_SET_NUMAB_DISABLE, 1) > 2. prctl(PR_NUMA_BALANCING, PR_SET_THP_ENABLE); An enable prctl will have the same problems as prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING, 0/1) -- it should have meaning if the numa_balancing sysctl is disabled. > 3. prctl(PR_NUMA_BALANCING, PR_GET_THP); > PR_GET_NUMAB_DISABLE -- Mel Gorman SUSE Labs
