netdev - Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets

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Message-ID: <20210528090421.GK30378@techsingularity.net>
Date:   Fri, 28 May 2021 10:04:21 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Andrii Nakryiko' <andrii.nakryiko@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Hritik Vijay <hritikxx8@...il.com>, bpf <bpf@...r.kernel.org>,
        Linux-Net <netdev@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] mm/page_alloc: Work around a pahole limitation with
 zero-sized struct pagesets

On Fri, May 28, 2021 at 08:09:39AM +0000, David Laight wrote:
> From: Andrii Nakryiko
> > Sent: 27 May 2021 15:42
> ...
> > I agree that empty structs are useful, but here we are talking about
> > per-CPU variables only, which is the first use case so far, as far as
> > I can see. If we had pahole 1.22 released and widely packaged it could
> > have been a viable option to force it on everyone. 
> ...
> 
> Would it be feasible to put the sources for pahole into the
> kernel repository and build it at the same time as objtool?
> 

We don't store other build dependencies like compilers, binutils etc in
the kernel repository even though minimum versions are mandated.
Obviously tools/ exists but for the most part, they are tools that do
not exist in other repositories and are kernel-specific. I don't know if
pahole would be accepted and it introduces the possibility that upstream
pahole and the kernel fork of it would diverge.

-- 
Mel Gorman
SUSE Labs