Bug#964036: marked as done (linux: Please set CONFIG_HWLAT_TRACER=y)
Your message dated Fri, 23 Apr 2021 13:17:30 +0200
with message-id <[🔎] YIKsyje2ETaO46v0@eldamar.lan>
and subject line Re: Bug#964036: linux: Please set CONFIG_HWLAT_TRACER=y
has caused the Debian Bug report #964036,
regarding linux: Please set CONFIG_HWLAT_TRACER=y
to be marked as done.
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964036: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964036
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--- Begin Message ---
- To: Debian Bug Tracking System <submit@bugs.debian.org>
- Cc: Steven Rostedt <srostedt@vmware.com>
- Subject: linux: Please set CONFIG_HWLAT_TRACER=y
- From: Christopher Obbard <obbardc@gmail.com>
- Date: Tue, 30 Jun 2020 20:52:26 +0100
- Message-id: <CAP03XeokgKJZoXBaegGscWTdoYxPhgBjpj0Ni_H7ZVme_7F5oQ@mail.gmail.com>
Source: linux
Severity: wishlist
Dear Maintainer,
Setting CONFIG_HWLAT_TRACER=y enables a tracer to detect hardware latencies
with no overhead when not used. It is not designed to be run on a production
system, but is a useful tracer to use in embedded systems.
Other distros enable this configuration option, I see no security issues or
performance issues for users since this is by-default turned off so has to be
enabled at runtime.
Thanks,
Chris
-- System Information:
Debian Release: bullseye/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.7.0-1-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
--- End Message ---
--- Begin Message ---
Control: tags -1 + moreinfo
On Tue, Jun 30, 2020 at 08:52:26PM +0100, Christopher Obbard wrote:
> Source: linux
> Severity: wishlist
>
> Dear Maintainer,
>
> Setting CONFIG_HWLAT_TRACER=y enables a tracer to detect hardware latencies
> with no overhead when not used. It is not designed to be run on a production
> system, but is a useful tracer to use in embedded systems.
>
> Other distros enable this configuration option, I see no security issues or
> performance issues for users since this is by-default turned off so has to be
> enabled at runtime.
This is enabled in the RT featureset enabled kernels, and from a
previous commit from Ben Hutchings:
commit 52e8d9f36fbe727523eef4950f0fa3afb25787cd
Author: Ben Hutchings <ben@decadent.org.uk>
Date: Tue May 2 04:48:15 2017 +0100
[rt] tracing: Enable HWLAT_TRACER
This is in mainline but not that useful without PREEMPT_RT.
HWLAT_DETECTOR no longer exists but I didn't notice because
kconfigeditor2 only looks at the mainline Kconfig files.
So I guess we can close this bugreport.
Regards,
Salvatore
--- End Message ---
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