linux-kernel - Re: [PATCH bpf-next v4 0/3] Allow mmap of /sys/kernel/btf/vmlinux

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Message-ID: <fb6121db-9872-4e33-bc7b-82b026b0097a@oracle.com>
Date: Thu, 15 May 2025 08:51:45 +0100
From: Alan Maguire <alan.maguire@...cle.com>
To: lmb@...valent.com
Cc: andrii@...nel.org, arnd@...db.de, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com,
        john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, martin.lau@...ux.dev, mykolal@...com,
        sdf@...ichev.me, shuah@...nel.org, song@...nel.org,
        yonghong.song@...ux.dev
Subject: Re: [PATCH bpf-next v4 0/3] Allow mmap of /sys/kernel/btf/vmlinux

> 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 <lmb@...valent.com>

For the series,

Tested-by: Alan Maguire <alan.maguire@...cle.com>

Tested with 4k and 64k page size on aarch64; all worked perfectly. Thanks!