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| <h4 class="subsection">9.13.12 AMD's Lightweight Profiling Instructions</h4> |
| |
| <p><a name="index-LWP_002c-i386-980"></a><a name="index-LWP_002c-x86_002d64-981"></a> |
| <code>as</code> supports AMD's Lightweight Profiling (LWP) |
| instruction set, available on AMD's Family 15h (Orochi) processors. |
| |
| <p>LWP enables applications to collect and manage performance data, and |
| react to performance events. The collection of performance data |
| requires no context switches. LWP runs in the context of a thread and |
| so several counters can be used independently across multiple threads. |
| LWP can be used in both 64-bit and legacy 32-bit modes. |
| |
| <p>For detailed information on the LWP instruction set, see the |
| <cite>AMD Lightweight Profiling Specification</cite> available at |
| <a href="http://developer.amd.com/cpu/LWP">Lightweight Profiling Specification</a>. |
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