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([2a0b:e7c0:0:107::aaaa:69]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8989196980sm763866666b.126.2024.09.03.23.06.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Sep 2024 23:06:19 -0700 (PDT) Message-ID: Date: Wed, 4 Sep 2024 08:06:17 +0200 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] kbuild: bpf: Do not run pahole with -j on 32bit userspace From: Jiri Slaby To: Arnaldo Carvalho de Melo Cc: Shung-Hsi Yu , dwarves@vger.kernel.org, Jiri Olsa , masahiroy@kernel.org, linux-kernel@vger.kernel.org, Nathan Chancellor , Nicolas Schier , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , linux-kbuild@vger.kernel.org, bpf@vger.kernel.org, msuchanek@suse.com References: <20240820085950.200358-1-jirislaby@kernel.org> <523c1afa-ed9d-4c76-baea-1c43b1b0c682@kernel.org> <7ebee21d-058f-4f83-8959-bd7aaa4e7719@kernel.org> <7016b011-cab3-4fbd-9fa7-19dd0123c989@kernel.org> Content-Language: en-US Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 27. 08. 24, 10:37, Jiri Slaby wrote: > On 26. 08. 24, 19:03, Arnaldo Carvalho de Melo wrote: >> On Mon, Aug 26, 2024 at 10:57:22AM +0200, Jiri Slaby wrote: >>> On 22. 08. 24, 17:24, Arnaldo Carvalho de Melo wrote: >>>> On Thu, Aug 22, 2024 at 11:55:05AM +0800, Shung-Hsi Yu wrote: >>>> I stumbled on this limitation as well when trying to build the >>>> kernel on >>>> a Libre Computer rk3399-pc board with only 4GiB of RAM, there I just >>>> created a swapfile and it managed to proceed, a bit slowly, but worked >>>> as well. >>> >>> Here, it hits the VM space limit (3 G). >> >> right, in my case it was on a 64-bit system, so just not enough memory, >> not address space. >>>> Please let me know if what is in the 'next' branch of: >> >>>> https://git.kernel.org/pub/scm/devel/pahole/pahole.git >> >>>> Works for you, that will be extra motivation to move it to the master >>>> branch and cut 1.28. >> >>> on 64bit (-j1): >>> * master: 3.706 GB >>> (* master + my changes: 3.559 GB) >>> * next: 3.157 GB >>> on 32bit: >>>   * master-j1: 2.445 GB >>>   * master-j16: 2.608 GB >>>   * master-j32: 2.811 GB >>>   * next-j1: 2.256 GB >>>   * next-j16: 2.401 GB >>>   * next-j32: 2.613 GB >>> >>> It's definitely better. So I think it could work now, if the thread >>> count >>> was limited to 1 on 32bit. As building with -j10, -j20 randomly fails on >>> random machines (32bit processes only of course). Unlike -j1. >> >> Cool, I just merged a patch from Alan Maguire that should help with the >> parallel case, would be able to test it? It is in the 'next' branch: > > Not much helping. > > On my box (as all previous runs): > next-j1 2.242 > next-j16 2.808 > next-j32 2.646 > > On a build host: > next-j1: 2.242 > next-j16: 2.824 > next-j20: 2.902 (crash) > next-j32: 2.902 (crash) So I disabled BTF on all 32bits (arm+i586) in openSUSE Tumbleweed for now. Better kernel without BTF, than no kernel at all 8-). If you have ideas to force -j1 on 32bit, I can reenable/retest... thanks, -- js suse labs