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Bug#857608: marked as done (linux-image-4.9.0-2-rt-amd64-unsigned: please build with CONFIG_LATENCYTOP)

Your message dated Mon, 13 Mar 2017 14:27:34 +0000
with message-id <1489415254.2852.4.camel@decadent.org.uk>
and subject line Re: Bug#857608: linux-image-4.9.0-2-rt-amd64-unsigned: please build with CONFIG_LATENCYTOP
has caused the Debian Bug report #857608,
regarding linux-image-4.9.0-2-rt-amd64-unsigned: please build with CONFIG_LATENCYTOP
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
857608: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857608
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-image-4.9.0-2-rt-amd64-unsigned
Version: 4.9.13-1


Dear maintainer,

the Debian kernels are currently built without the CONFIG_LATENCYTOP option:

$ grep LATENCYTOP /boot/config-4.9.0-2-*
/boot/config-4.9.0-2-amd64:# CONFIG_LATENCYTOP is not set
/boot/config-4.9.0-2-rt-amd64:# CONFIG_LATENCYTOP is not set

The result is this:

# latencytop
mount: none is already mounted or /sys/kernel/debug busy
Please enable the CONFIG_LATENCYTOP configuration in your kernel.
Exiting...

So could you please enable this option?

-- 
Laurent.

--- End Message ---
--- Begin Message --- 
On Mon, 2017-03-13 at 09:12 +0100, Laurent Bonnaud wrote:
> Package: linux-image-4.9.0-2-rt-amd64-unsigned
> Version: 4.9.13-1
> 
> 
> Dear maintainer,
> 
> the Debian kernels are currently built without the CONFIG_LATENCYTOP
> option:
> 
> $ grep LATENCYTOP /boot/config-4.9.0-2-*
> /boot/config-4.9.0-2-amd64:# CONFIG_LATENCYTOP is not set
> /boot/config-4.9.0-2-rt-amd64:# CONFIG_LATENCYTOP is not set
> 
> The result is this:
> 
> # latencytop
> mount: none is already mounted or /sys/kernel/debug busy
> Please enable the CONFIG_LATENCYTOP configuration in your kernel.
> Exiting...
> 
> So could you please enable this option?

It adds an extra 4K (2K on 32-bit) to the task_struct for every task in
the system.  This is not an acceptable cost.  Sorry, you'll have to
build a custom kernel to enable this feature.

Ben.

-- 
Ben Hutchings
If at first you don't succeed, you're doing about average.

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