Re: How to disable tracing at runtime from the Linux kernel command line?
- Date: Sat, 14 Apr 2018 12:30:09 -0400
- From: Steven Rostedt <rostedt@xxxxxxxxxxx>
- Subject: Re: How to disable tracing at runtime from the Linux kernel command line?
On Sat, 14 Apr 2018 15:09:33 +0200
Paul Menzel <pmenzel+linux-tracing@xxxxxxxxxxxxx> wrote:
> Dear Linux folks,
> I am trying to reduce the boot time of a standard Linux distribution
> kernel. Currently, distributions – at least Debian und Ubuntu – enable
> function tracing.
> This is great, as it makes it easy to use tracing to hunt down things
> holding up the boot. But it also skews the boot time quite a lot.
> $ sudo dmesg
> [ 0.318412] initcall init_graph_trace+0x0/0x64 returned 0 after
> 199218 usecs
> [ 1.770287] calling event_trace_init+0x0/0x2c2 @ 1
> [ 2.052871] initcall event_trace_init+0x0/0x2c2 returned 0 after
> 275942 usecs
> Is there a way to disable tracing on the Linux kernel command line to
> disable tracing?
Try initcall_blacklist. But you acquire all risks when doing so. I
never tried it, so I have no idea what side effects that may have.