Changes v2 => v3: 1. Fix tailcall. Changes v1 => v2: 1. Use text_poke instead of writing through linear mapping. (Peter) 2. Avoid making changes to non-x86_64 code. Most BPF programs are small, but they consume a page each. For systems with busy traffic and many BPF programs, this could also add significant pressure to instruction TLB. This set tries to solve this problem with customized allocator that pack multiple programs into a huge page. Patches 1-5 prepare the work. Patch 6 contains key logic of the allocator. Patch 7 uses this allocator in x86_64 jit compiler. Song Liu (7): x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem bpf: use size instead of pages in bpf_binary_header bpf: add a pointer of bpf_binary_header to bpf_prog x86/alternative: introduce text_poke_jit bpf: introduce bpf_prog_pack allocator bpf, x86_64: use bpf_prog_pack allocator arch/x86/Kconfig | 1 + arch/x86/include/asm/text-patching.h | 1 + arch/x86/kernel/alternative.c | 28 ++++ arch/x86/net/bpf_jit_comp.c | 133 +++++++++++++---- include/linux/bpf.h | 4 +- include/linux/filter.h | 23 ++- kernel/bpf/core.c | 213 ++++++++++++++++++++++++--- kernel/bpf/trampoline.c | 6 +- 8 files changed, 350 insertions(+), 59 deletions(-) -- 2.30.2
