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Subject[PATCH v2 bpf-next 0/7] bpf_prog_pack allocator
Date
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 | 93 ++++++++++--
include/linux/bpf.h | 4 +-
include/linux/filter.h | 23 ++-
kernel/bpf/core.c | 213 ++++++++++++++++++++++++---
kernel/bpf/trampoline.c | 6 +-
8 files changed, 328 insertions(+), 41 deletions(-)

--
2.30.2

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