Re: Re: Re: Re: Re: Re: Re: [PATCH v1] sched/numa: add per-process numa_balancing
From: Mel Gorman
Date: Wed Nov 17 2021 - 05:10:24 EST
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);