Most BPF programs are small, but they consume a page each. For systems with busy traffic and many BPF programs, this may also add significant pressure on instruction TLB. High iTLB pressure usually slows down the whole system causing visible performance degradation for production workloads. bpf_prog_pack, a customized allocator that packs multiple bpf programs into preallocated memory chunks, was proposed [1] to address it. This series extends this support on powerpc. Patches 1 & 2 add the arch specific functions needed to support this feature. Patch 3 enables the support for powerpc. The last patch ensures cleanup is handled racefully. Tested the changes successfully on a PowerVM. patch_instruction(), needed for bpf_arch_text_copy(), is failing for ppc32. Debugging it. Posting the patches in the meanwhile for feedback on these changes. [1] https://lore.kernel.org/bpf/20220204185742.271030-1-song@xxxxxxxxxx/ Hari Bathini (3): powerpc/bpf: implement bpf_arch_text_copy powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack powerpc/bpf: use bpf_jit_binary_pack_[alloc|finalize|free] arch/powerpc/net/bpf_jit.h | 18 +-- arch/powerpc/net/bpf_jit_comp.c | 194 ++++++++++++++++++++++++------ arch/powerpc/net/bpf_jit_comp32.c | 26 ++-- arch/powerpc/net/bpf_jit_comp64.c | 32 ++--- 4 files changed, 198 insertions(+), 72 deletions(-) -- 2.37.3
