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| <a name="Analyze-Collected-Data"></a> |
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| Next: <a href="Tracepoint-Variables.html#Tracepoint-Variables" accesskey="n" rel="next">Tracepoint Variables</a>, Previous: <a href="Set-Tracepoints.html#Set-Tracepoints" accesskey="p" rel="prev">Set Tracepoints</a>, Up: <a href="Tracepoints.html#Tracepoints" accesskey="u" rel="up">Tracepoints</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Using-the-Collected-Data"></a> |
| <h3 class="section">13.2 Using the Collected Data</h3> |
| |
| <p>After the tracepoint experiment ends, you use <small>GDB</small> commands |
| for examining the trace data. The basic idea is that each tracepoint |
| collects a trace <em>snapshot</em> every time it is hit and another |
| snapshot every time it single-steps. All these snapshots are |
| consecutively numbered from zero and go into a buffer, and you can |
| examine them later. The way you examine them is to <em>focus</em> on a |
| specific trace snapshot. When the remote stub is focused on a trace |
| snapshot, it will respond to all <small>GDB</small> requests for memory and |
| registers by reading from the buffer which belongs to that snapshot, |
| rather than from <em>real</em> memory or registers of the program being |
| debugged. This means that <strong>all</strong> <small>GDB</small> commands |
| (<code>print</code>, <code>info registers</code>, <code>backtrace</code>, etc.) will |
| behave as if we were currently debugging the program state as it was |
| when the tracepoint occurred. Any requests for data that are not in |
| the buffer will fail. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="tfind.html#tfind" accesskey="1">tfind</a>:</td><td> </td><td align="left" valign="top">How to select a trace snapshot |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="tdump.html#tdump" accesskey="2">tdump</a>:</td><td> </td><td align="left" valign="top">How to display all data for a snapshot |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="save-tracepoints.html#save-tracepoints" accesskey="3">save tracepoints</a>:</td><td> </td><td align="left" valign="top">How to save tracepoints for a future run |
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