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Date: Wed, 28 Feb 2024 12:04:02 +0000
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Subject: Re: [PATCH] fix linux kernel BTF builds: increase max percpu
 variables by 10x
To: Jiri Olsa <olsajiri@gmail.com>, John Hubbard <jhubbard@nvidia.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
        Alexei Starovoitov <ast@kernel.org>, bpf@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>, dwarves@vger.kernel.org
References: <20240228032142.396719-1-jhubbard@nvidia.com>
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From: Alan Maguire <alan.maguire@oracle.com>
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On 28/02/2024 09:20, Jiri Olsa wrote:
> On Tue, Feb 27, 2024 at 07:21:42PM -0800, John Hubbard wrote:
>> When building the Linux kernel with a distro .config, most or even all
>> possible kernel modules are built. This adds up to 4500+ modules, and
>> based on my testing, this causes the pahole utility to run out of space,
>> which shows up like this (CONFIG_DEBUG_INFO_BTF=y is required in order
>> to reproduce this):
>>
>>   LD      .tmp_vmlinux.btf
>>   BTF     .btf.vmlinux.bin.o
>> Reached the limit of per-CPU variables: 4096
>> ...repeated many times...
>> Reached the limit of per-CPU variables: 4096
>>   LD      .tmp_vmlinux.kallsyms1
>>   NM      .tmp_vmlinux.kallsyms1.syms
>>   KSYMS   .tmp_vmlinux.kallsyms1.S
>>   AS      .tmp_vmlinux.kallsyms1.S
>>   LD      .tmp_vmlinux.kallsyms2
>>   NM      .tmp_vmlinux.kallsyms2.syms
>>   KSYMS   .tmp_vmlinux.kallsyms2.S
>>   AS      .tmp_vmlinux.kallsyms2.S
>>   LD      vmlinux
>>   BTFIDS  vmlinux
>> libbpf: failed to find '.BTF' ELF section in vmlinux
>> FAILED: load BTF from vmlinux: No data available
>> make[2]: *** [scripts/Makefile.vmlinux:37: vmlinux] Error 255
>> make[2]: *** Deleting file 'vmlinux'
>> make[1]: *** [/kernel_work/linux-people/Makefile:1162: vmlinux] Error 2
>> make: *** [Makefile:240: __sub-make] Error 2
>>
>> Increasing MAX_PERCPU_VAR_CNT by 10x avoids running out of space, and
>> allows the build to succeed.
> 
> do you have an actual count of percpu variables for your config?
> 10x seems a lot to me
> 
> this might be a workaround, but we should make encoder->percpu.vars
> dynamically allocated like we do for functions
> 
> jirka
>

Good idea Jiri; John would you mind trying the attached patch? Thanks!

Alan
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