From: "Daniel Xu" <dxu@dxuuu.xyz>
To: "Lorenz Bauer" <lmb@isovalent.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@fomichev.me>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Mykola Lysenko" <mykolal@fb.com>,
"Shuah Khan" <shuah@kernel.org>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf-next 0/2] Allow mmap of /sys/kernel/btf/vmlinux
Date: Thu, 01 May 2025 08:58:46 -0700 [thread overview]
Message-ID: <ec03896b-feac-4fa5-a213-7e9f57e15f72@app.fastmail.com> (raw)
In-Reply-To: <20250501-vmlinux-mmap-v1-0-aa2724572598@isovalent.com>
On Thu, May 1, 2025, at 7:28 AM, Lorenz Bauer wrote:
> I'd like to cut down the memory usage of parsing vmlinux BTF in ebpf-go.
> With some upcoming changes the library is sitting at 5MiB for a parse.
> Most of that memory is simply copying the BTF blob into user space.
> By allowing vmlinux BTF to be mmapped read-only into user space I can
> cut memory usage by about 75%.
Cool! Maybe teach libbpf to use this as well? So everyone else can pick up
the win transparently.
>
> Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
> ---
> Lorenz Bauer (2):
> btf: allow mmap of vmlinux btf
> selftests: bpf: add a test for mmapable vmlinux BTF
>
> include/asm-generic/vmlinux.lds.h | 3 +-
> kernel/bpf/sysfs_btf.c | 25 ++++++-
> tools/testing/selftests/bpf/prog_tests/btf_sysfs.c | 79 ++++++++++++++++++++++
> 3 files changed, 104 insertions(+), 3 deletions(-)
> ---
> base-commit: 38d976c32d85ef12dcd2b8a231196f7049548477
> change-id: 20250501-vmlinux-mmap-2ec5563c3ef1
>
> Best regards,
> --
> Lorenz Bauer <lmb@isovalent.com>
prev parent reply other threads:[~2025-05-01 15:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-01 14:28 [PATCH bpf-next 0/2] Allow mmap of /sys/kernel/btf/vmlinux Lorenz Bauer
2025-05-01 14:28 ` [PATCH bpf-next 1/2] btf: allow mmap of vmlinux btf Lorenz Bauer
2025-05-01 20:26 ` Alexei Starovoitov
2025-05-02 10:19 ` Lorenz Bauer
2025-05-01 14:28 ` [PATCH bpf-next 2/2] selftests: bpf: add a test for mmapable vmlinux BTF Lorenz Bauer
2025-05-01 15:58 ` Daniel Xu [this message]
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