From: Song Liu <song@kernel.org>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: <ast@kernel.org>, <daniel@iogearbox.net>, <andrii@kernel.org>,
<kernel-team@fb.com>, <peterz@infradead.org>, <x86@kernel.org>,
Song Liu <song@kernel.org>
Subject: [PATCH v3 bpf-next 0/7] bpf_prog_pack allocator
Date: Wed, 5 Jan 2022 18:25:26 -0800 [thread overview]
Message-ID: <20220106022533.2950016-1-song@kernel.org> (raw)
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
next reply other threads:[~2022-01-06 2:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-06 2:25 Song Liu [this message]
2022-01-06 2:25 ` [PATCH v3 bpf-next 1/7] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 2/7] bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 3/7] bpf: use size instead of pages in bpf_binary_header Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 4/7] bpf: add a pointer of bpf_binary_header to bpf_prog Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 5/7] x86/alternative: introduce text_poke_jit Song Liu
2022-01-11 12:13 ` Peter Zijlstra
2022-01-11 17:43 ` Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 6/7] bpf: introduce bpf_prog_pack allocator Song Liu
2022-01-06 2:25 ` [PATCH v3 bpf-next 7/7] bpf, x86_64: use " Song Liu
2022-01-11 12:04 ` Peter Zijlstra
2022-01-11 17:26 ` Song Liu
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