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

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To: "'Andrii Nakryiko'" <andrii.nakryiko@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: RE: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
From: David Laight <David.Laight@xxxxxxxxxx>
Date: Fri, 28 May 2021 08:09:39 +0000
Accept-language: en-GB, en-US
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Michal Suchanek <msuchanek@xxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Martin KaFai Lau <kafai@xxxxxx>, "Song Liu" <songliubraving@xxxxxx>, Yonghong Song <yhs@xxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, KP Singh <kpsingh@xxxxxxxxxx>, open list <linux-kernel@xxxxxxxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Hritik Vijay <hritikxx8@xxxxxxxxx>, bpf <bpf@xxxxxxxxxxxxxxx>, Linux-Net <netdev@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>
In-reply-to: <CAEf4BzbzPK-3cyLFM8QKE5-o_dL7=UCcvRF+rEqyUcHhyY+FJg@mail.gmail.com>
References: <20210526080741.GW30378@techsingularity.net> <YK9SiLX1E1KAZORb@infradead.org> <20210527090422.GA30378@techsingularity.net> <YK9j3YeMTZ+0I8NA@infradead.org> <CAEf4BzZLy0s+t+Nj9QgUNM66Ma6HN=VkS+ocgT5h9UwanxHaZQ@mail.gmail.com> <CAEf4BzbzPK-3cyLFM8QKE5-o_dL7=UCcvRF+rEqyUcHhyY+FJg@mail.gmail.com>

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?

That would remove any issues about the latest version
not being available.

	David

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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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Follow-Ups:
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Andrii Nakryiko
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Mel Gorman

References:
- [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Mel Gorman
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Christoph Hellwig
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Mel Gorman
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Christoph Hellwig
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Andrii Nakryiko
- Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
  - From: Andrii Nakryiko

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