* about QTro packet (tracepoints)
@ 2003-10-01 6:23 ankit thukral
2003-10-01 6:43 ` Jim Blandy
0 siblings, 1 reply; 2+ messages in thread
From: ankit thukral @ 2003-10-01 6:23 UTC (permalink / raw)
To: gdb
hi all,
i was reading the packets' format in GDB for
tracepoints (like QTStart,QTinit etc.) and came
across
"QTro" packet format.i learned that this packet
transmits the addresses of all the LOADABLE
READ-ONLY
sections to the remote stub so that the latter can
always entertain a request for data belonging to
these
address ranges,even if this was not specified as a
tracepoint action by the user.
would it not be a better option to let the
remote stub collect this information of it's own
(from
it's own copy of the executable) rather than GDB
transmitting it across the network which definitely
is
more costly in terms of time delay suffered by the
process which becomes all the more costly while
debugging a real-time application?
hoping for a discussion on this,
ankit.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: about QTro packet (tracepoints)
2003-10-01 6:23 about QTro packet (tracepoints) ankit thukral
@ 2003-10-01 6:43 ` Jim Blandy
0 siblings, 0 replies; 2+ messages in thread
From: Jim Blandy @ 2003-10-01 6:43 UTC (permalink / raw)
To: ankit thukral; +Cc: gdb
ankit thukral <ankit_plug@yahoo.com> writes:
> hi all,
> i was reading the packets' format in GDB for
> tracepoints (like QTStart,QTinit etc.) and came
> across
> "QTro" packet format.i learned that this packet
> transmits the addresses of all the LOADABLE
> READ-ONLY
> sections to the remote stub so that the latter can
> always entertain a request for data belonging to
> these
> address ranges,even if this was not specified as a
> tracepoint action by the user.
> would it not be a better option to let the
> remote stub collect this information of it's own
> (from
> it's own copy of the executable) rather than GDB
> transmitting it across the network which definitely
> is
> more costly in terms of time delay suffered by the
> process which becomes all the more costly while
> debugging a real-time application?
If you're running Linux or something like that on the target, sure.
But tracepoints also need to work on systems with no operating system
at all, just a stub. In that case, the stub has no idea which
sections are read-only and which sections may change.
The QTro packet is only sent once, when the trace experiment begins;
is it actually a major time sink? How many sections do you have?
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