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[24.46.218.209]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6f6e39f588asm25725556d6.49.2025.05.10.05.35.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 May 2025 05:35:10 -0700 (PDT) From: Lorenz Bauer Subject: [PATCH bpf-next v4 0/3] Allow mmap of /sys/kernel/btf/vmlinux Date: Sat, 10 May 2025 08:34:53 -0400 Message-Id: <20250510-vmlinux-mmap-v4-0-69e424b2a672@isovalent.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAO1HH2gC/23OQQ6CMBAF0KuYrq1ppwyIK+9hXNQySBNoCcUGQ 7i7DSuCLH9+5v2ZWaDBUmC308wGijZY71LIzidmGu3exG2VMgMBKFBIHrvWus/Eu073HMgg5so oqiVLJ/1AtZ1W7sFefc0dTSN7pqaxYfTDd92Jcu2PySi54FpDARkWgOX1boOPuiU3XozvVizCF oAdAAko0UAhM5WhLI8AtQVwB6gEYIVK11rkgv4+WJblB/OdXWE4AQAA X-Change-ID: 20250501-vmlinux-mmap-2ec5563c3ef1 To: Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Lorenz Bauer X-Mailer: b4 0.14.2 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%. Signed-off-by: Lorenz Bauer --- Changes in v4: - Go back to remap_pfn_range for aarch64 compat - Dropped btf_new_no_copy (Andrii) - Fixed nits in selftests (Andrii) - Clearer error handling in the mmap handler (Andrii) - Fixed build on s390 - Link to v3: https://lore.kernel.org/r/20250505-vmlinux-mmap-v3-0-5d53afa060e8@isovalent.com Changes in v3: - Remove slightly confusing calculation of trailing (Alexei) - Use vm_insert_page (Alexei) - Simplified libbpf code - Link to v2: https://lore.kernel.org/r/20250502-vmlinux-mmap-v2-0-95c271434519@isovalent.com Changes in v2: - Use btf__new in selftest - Avoid vm_iomap_memory in btf_vmlinux_mmap - Add VM_DONTDUMP - Add support to libbpf - Link to v1: https://lore.kernel.org/r/20250501-vmlinux-mmap-v1-0-aa2724572598@isovalent.com --- Lorenz Bauer (3): btf: allow mmap of vmlinux btf selftests: bpf: add a test for mmapable vmlinux BTF libbpf: Use mmap to parse vmlinux BTF from sysfs include/asm-generic/vmlinux.lds.h | 3 +- kernel/bpf/sysfs_btf.c | 32 ++++++++ tools/lib/bpf/btf.c | 85 ++++++++++++++++++---- tools/testing/selftests/bpf/prog_tests/btf_sysfs.c | 81 +++++++++++++++++++++ 4 files changed, 184 insertions(+), 17 deletions(-) --- base-commit: 7220eabff8cb4af3b93cd021aa853b9f5df2923f change-id: 20250501-vmlinux-mmap-2ec5563c3ef1 Best regards, -- Lorenz Bauer