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From: Matthew Wilcox <willy@infradead.org>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>, Hao Luo <haoluo@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	bpf@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-perf-users@vger.kernel.org, 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@chromium.org>,
	Stanislav Fomichev <sdf@google.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Namhyung Kim <namhyung@gmail.com>,
	Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCHv3 bpf-next 0/9] mm/bpf/perf: Store build id in file object
Date: Sat, 18 Mar 2023 15:16:45 +0000	[thread overview]
Message-ID: <ZBXV3crf/wX5D9lo@casper.infradead.org> (raw)
In-Reply-To: <ZBV3beyxYhKv/kMp@krava>

On Sat, Mar 18, 2023 at 09:33:49AM +0100, Jiri Olsa wrote:
> On Thu, Mar 16, 2023 at 05:34:41PM +0000, Matthew Wilcox wrote:
> > On Thu, Mar 16, 2023 at 06:01:40PM +0100, Jiri Olsa wrote:
> > > hi,
> > > this patchset adds build id object pointer to struct file object.
> > > 
> > > We have several use cases for build id to be used in BPF programs
> > > [2][3].
> > 
> > Yes, you have use cases, but you never answered the question I asked:
> > 
> > Is this going to be enabled by every distro kernel, or is it for special
> > use-cases where only people doing a very specialised thing who are
> > willing to build their own kernels will use it?
> 
> I hope so, but I guess only time tell.. given the response by Ian and Andrii
> there are 3 big users already

So the whole "There's a config option to turn it off" shtick is just a
fig-leaf.  I won't ever see it turned off.  You're imposing the cost of
this on EVERYONE who runs a distro kernel.  And almost nobody will see
any benefits from it.  Thanks for admitting that.


  reply	other threads:[~2023-03-18 15:17 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-16 17:01 [PATCHv3 bpf-next 0/9] mm/bpf/perf: Store build id in file object Jiri Olsa
2023-03-16 17:01 ` [PATCHv3 bpf-next 1/9] mm: " Jiri Olsa
2023-03-16 22:07   ` Andrii Nakryiko
2023-03-16 17:01 ` [PATCHv3 bpf-next 2/9] perf: Use file object build id in perf_event_mmap_event Jiri Olsa
2023-03-16 17:01 ` [PATCHv3 bpf-next 3/9] bpf: Use file object build id in stackmap Jiri Olsa
2023-03-16 22:07   ` Andrii Nakryiko
2023-03-16 17:01 ` [PATCHv3 bpf-next 4/9] bpf: Switch BUILD_ID_SIZE_MAX to enum Jiri Olsa
2023-03-16 22:07   ` Andrii Nakryiko
2023-03-16 17:01 ` [PATCHv3 bpf-next 5/9] selftests/bpf: Add read_buildid function Jiri Olsa
2023-03-16 22:23   ` Andrii Nakryiko
2023-03-30 22:05     ` Jiri Olsa
2023-03-16 17:01 ` [PATCHv3 bpf-next 6/9] selftests/bpf: Add err.h header Jiri Olsa
2023-03-16 22:24   ` Andrii Nakryiko
2023-03-16 17:01 ` [PATCHv3 bpf-next 7/9] selftests/bpf: Replace extract_build_id with read_build_id Jiri Olsa
2023-03-16 17:01 ` [PATCHv3 bpf-next 8/9] selftests/bpf: Add iter_task_vma_buildid test Jiri Olsa
2023-03-16 22:31   ` Andrii Nakryiko
2023-03-16 17:01 ` [PATCHv3 bpf-next 9/9] selftests/bpf: Add file_build_id test Jiri Olsa
2023-03-16 19:59   ` Daniel Borkmann
2023-03-16 22:36   ` Andrii Nakryiko
2023-03-16 17:34 ` [PATCHv3 bpf-next 0/9] mm/bpf/perf: Store build id in file object Matthew Wilcox
2023-03-16 17:50   ` Ian Rogers
2023-03-16 21:51     ` Andrii Nakryiko
2023-03-17  3:51       ` Matthew Wilcox
2023-03-17 16:33         ` Andrii Nakryiko
2023-03-17 21:14           ` Al Viro
2023-03-17 21:21             ` Al Viro
2023-03-18  6:08               ` Andrii Nakryiko
2023-03-18  8:34                 ` Jiri Olsa
2023-03-18  8:33   ` Jiri Olsa
2023-03-18 15:16     ` Matthew Wilcox [this message]
2023-03-18 17:40       ` Jiri Olsa
2023-03-22 15:45       ` Arnaldo Carvalho de Melo
2023-03-31 18:19         ` Andrii Nakryiko
2023-03-31 18:36           ` Matthew Wilcox
2023-03-31 20:27             ` Andrii Nakryiko

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