Re: [Xen-devel] [PATCH v5 4/4] xen: add per-cpu buffer option to debugtrace

[Jan Beulich <jbeulich@xxxxxxxx>]

On 05.09.2019 13:39, Juergen Gross wrote:
> debugtrace is normally writing trace entries into a single trace
> buffer. There are cases where this is not optimal, e.g. when hunting
> a bug which requires writing lots of trace entries and one cpu is
> stuck. This will result in other cpus filling the trace buffer and
> finally overwriting the interesting trace entries of the hanging cpu.
> 
> In order to be able to debug such situations add the capability to use
> per-cpu trace buffers. This can be selected by specifying the
> debugtrace boot parameter with the modifier "cpu:", like:
> 
>   debugtrace=cpu:16
> 
> At the same time switch the parsing function to accept size modifiers
> (e.g. 4M or 1G).
> 
> Printing out the trace entries is done for each buffer in order to
> minimize the effort needed during printing. As each entry is prefixed
> with its sequence number sorting the entries can easily be done when
> analyzing them.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel