On Fri, 9 Feb 2024 at 05:07, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > From: Alexei Starovoitov <ast@xxxxxxxxxx> > > Convert simple page_frag allocator to per-cpu page_frag to further stress test > a combination of __arena global and static variables and alloc/free from arena. > > Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> > --- I know this organically grew from a toy implementation, but since people will most likely be looking at selftests as usage examples, it might be better to expose bpf_preempt_disable/enable and use it in the case of per-CPU page_frag allocator? No need to block on this, can be added on top later. The kfunc is useful on its own for writing safe per-CPU data structures or other memory allocators like bpf_ma on top of arenas. It is also necessary as a building block for writing spin locks natively in BPF on top of the arena map which we may add later. I have a patch lying around for this, verifier plumbing is mostly the same as rcu_read_lock. I can send it out with tests, or otherwise if you want to add it to this series, you go ahead. > [...] >
