Re: [PATCH bpf-next v2 0/5] execmem_alloc for BPF programs

[Luis Chamberlain <mcgrof@kernel.org>]

On Mon, Nov 07, 2022 at 03:13:59PM -0800, Song Liu wrote:
> The benchmark used here is identical on our web service, which runs on
> many many servers, so it represents the workload that we care a lot.
> Unfortunately, it is not possible to run it out of our data centers.

I am not asking for that, I am asking for you to pick any similar
benchark which can run in paralellel which may yield similar results.

> We can build some artificial workloads and probably get much higher
> performance improvements. But these workload may not represent real
> world use cases.

You can very likely use some existing benchmark.

The direct map fragmentation stuff doesn't require much effort, as
was demonstrated by Aaron, you can easily do that or more by
running all selftests or just the test_bpf. This I buy.

I'm not buying the iTLB gains as I can't even reproduce them myself for
eBPF JIT, but I tested against iTLB when using eBPF JIT, perhaps you
mean iTLB gains for other memory intensive applications running in
tandem?

And none of your patches mentions the gains of this effort helping
with the long term advantage of centralizing the semantics for
permissions on memory.

  Luis