From: Hari Bathini <hbathini@linux.ibm.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
bpf@vger.kernel.org
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Song Liu <songliubraving@fb.com>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>
Subject: Re: [PATCH v6 0/5] powerpc/bpf: use BPF prog pack allocator
Date: Tue, 17 Oct 2023 11:56:09 +0530 [thread overview]
Message-ID: <ebb698eb-5629-afbf-ffa6-9a8f6fdee71c@linux.ibm.com> (raw)
In-Reply-To: <140a1e76-dfa4-d20e-fc10-09b4f3a85cb4@iogearbox.net>
On 16/10/23 5:37 pm, Daniel Borkmann wrote:
> On 10/12/23 10:03 PM, Hari Bathini wrote:
>> 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.
>>
>> Both bpf_arch_text_copy() & bpf_arch_text_invalidate() functions,
>> needed for this support depend on instruction patching in text area.
>> Currently, patch_instruction() supports patching only one instruction
>> at a time. The first patch introduces patch_instructions() function
>> to enable patching more than one instruction at a time. This helps in
>> avoiding performance degradation while JITing bpf programs.
>>
>> Patches 2 & 3 implement the above mentioned arch specific functions
>> using patch_instructions(). Patch 4 fixes a misnomer in bpf JITing
>> code. The last patch enables the use of BPF prog pack allocator on
>> powerpc and also, ensures cleanup is handled gracefully.
>>
>> [1] https://lore.kernel.org/bpf/20220204185742.271030-1-song@kernel.org/
>>
>> Changes in v6:
>> * No changes in patches 2-5/5 except addition of Acked-by tags from Song.
>> * Skipped merging code path of patch_instruction() & patch_instructions()
>> to avoid performance overhead observed on ppc32 with that.
>
> I presume this will be routed via Michael?
Yes, Daniel. This can go via linuxppc tree.
Thanks
Hari
prev parent reply other threads:[~2023-10-17 6:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-12 20:03 [PATCH v6 0/5] powerpc/bpf: use BPF prog pack allocator Hari Bathini
2023-10-12 20:03 ` [PATCH v6 1/5] powerpc/code-patching: introduce patch_instructions() Hari Bathini
2023-10-12 20:03 ` [PATCH v6 2/5] powerpc/bpf: implement bpf_arch_text_copy Hari Bathini
2023-10-12 20:03 ` [PATCH v6 3/5] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack Hari Bathini
2023-10-12 20:03 ` [PATCH v6 4/5] powerpc/bpf: rename powerpc64_jit_data to powerpc_jit_data Hari Bathini
2023-10-12 20:03 ` [PATCH v6 5/5] powerpc/bpf: use bpf_jit_binary_pack_[alloc|finalize|free] Hari Bathini
2023-10-19 6:11 ` Michael Ellerman
2023-10-20 14:15 ` Hari Bathini
2023-10-16 12:07 ` [PATCH v6 0/5] powerpc/bpf: use BPF prog pack allocator Daniel Borkmann
2023-10-17 6:26 ` Hari Bathini [this message]
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