I'd suggest you discuss you needs with the slab mainainers and the mm community firs. On Wed, Jun 22, 2022 at 05:32:25PM -0700, Alexei Starovoitov wrote: > From: Alexei Starovoitov <ast@xxxxxxxxxx> > > Introduce any context BPF specific memory allocator. > > Tracing BPF programs can attach to kprobe and fentry. Hence they > run in unknown context where calling plain kmalloc() might not be safe. > Front-end kmalloc() with per-cpu per-bucket cache of free elements. > Refill this cache asynchronously from irq_work. > > There is a lot more work ahead, but this set is useful base. > Future work: > - get rid of call_rcu in hash map > - get rid of atomic_inc/dec in hash map > - tune watermarks per allocation size > - adopt this approach alloc_percpu_gfp > - expose bpf_mem_alloc as uapi FD to be used in dynptr_alloc, kptr_alloc > - add sysctl to force bpf_mem_alloc in hash map when safe even if pre-alloc > requested to reduce memory consumption > - convert lru map to bpf_mem_alloc > > Alexei Starovoitov (5): > bpf: Introduce any context BPF specific memory allocator. > bpf: Convert hash map to bpf_mem_alloc. > selftests/bpf: Improve test coverage of test_maps > samples/bpf: Reduce syscall overhead in map_perf_test. > bpf: Relax the requirement to use preallocated hash maps in tracing > progs. > > include/linux/bpf_mem_alloc.h | 26 ++ > kernel/bpf/Makefile | 2 +- > kernel/bpf/hashtab.c | 16 +- > kernel/bpf/memalloc.c | 512 ++++++++++++++++++++++++ > kernel/bpf/verifier.c | 31 +- > samples/bpf/map_perf_test_kern.c | 22 +- > tools/testing/selftests/bpf/test_maps.c | 38 +- > 7 files changed, 610 insertions(+), 37 deletions(-) > create mode 100644 include/linux/bpf_mem_alloc.h > create mode 100644 kernel/bpf/memalloc.c > > -- > 2.30.2 > ---end quoted text---
