From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
Andrew Morton <akpm@linux-foundation.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Michal Suchanek <msuchanek@suse.de>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
open list <linux-kernel@vger.kernel.org>,
Jiri Olsa <jolsa@kernel.org>, Hritik Vijay <hritikxx8@gmail.com>,
bpf <bpf@vger.kernel.org>, Linux-Net <netdev@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets
Date: Thu, 27 May 2021 07:37:23 -0700 [thread overview]
Message-ID: <CAEf4BzZLy0s+t+Nj9QgUNM66Ma6HN=VkS+ocgT5h9UwanxHaZQ@mail.gmail.com> (raw)
In-Reply-To: <YK9j3YeMTZ+0I8NA@infradead.org>
On Thu, May 27, 2021 at 2:19 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Thu, May 27, 2021 at 10:04:22AM +0100, Mel Gorman wrote:
> > What do you suggest as an alternative?
> >
> > I added Arnaldo to the cc as he tagged the last released version of
> > pahole (1.21) and may be able to tag a 1.22 with Andrii's fix for pahole
> > included.
> >
> > The most obvious alternative fix for this issue is to require pahole
> > 1.22 to set CONFIG_DEBUG_INFO_BTF but obviously a version 1.22 that works
> > needs to exist first and right now it does not. I'd be ok with this but
> > users of DEBUG_INFO_BTF may object given that it'll be impossible to set
> > the option until there is a release.
>
> Yes, disable BTF. Empty structs are a very useful feature that we use
> in various places in the kernel. We can't just keep piling hacks over
> hacks to make that work with a recent fringe feature.
next prev parent reply other threads:[~2021-05-27 14:37 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 8:07 Mel Gorman
2021-05-26 8:16 ` David Hildenbrand
2021-05-26 8:33 ` (BTF) " Michal Suchánek
2021-05-26 9:00 ` Mel Gorman
2021-05-26 17:00 ` Andrii Nakryiko
2021-05-26 17:43 ` Michal Suchánek
2021-05-26 16:57 ` Andrii Nakryiko
2021-05-26 18:13 ` Mel Gorman
2021-05-26 18:41 ` Andrii Nakryiko
2021-05-27 8:04 ` Christoph Hellwig
2021-05-27 9:04 ` Mel Gorman
2021-05-27 9:18 ` Christoph Hellwig
2021-05-27 14:37 ` Andrii Nakryiko [this message]
2021-05-27 14:41 ` Andrii Nakryiko
2021-05-28 8:09 ` David Laight
2021-05-28 9:04 ` Mel Gorman
2021-05-28 9:49 ` David Laight
2021-05-28 9:56 ` Michal Suchánek
2021-05-28 13:09 ` David Laight
2021-05-30 0:46 ` Andrii Nakryiko
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