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Additional patches

This page provides a number of patches to the 2.6 kernel driver you might find useful.

IA-64 perfmon driver

This patch provides a perfmon-based interface for OProfile. This allows the use of the IA-64's performance counters with OProfile. Note that many machines have a firmware bug that will lead to unusual behaviour; typically, samples stop arriving after a short period of idle time. A work-around for this firmware bug is disable the CONFIG_IA64_PAL_IDLE kernel option.


Call-graph support

This patch provides support for call-graph profiling, currently only on x86. At each interrupt, the stack is recorded into the profile buffer, if the information is available in the registers. The user-space support for this, new in the 0.8 release, is still experimental.


Bottlenecks occur in surprising places, so don't try to second guess and put in a speed hack until you've proven that's where the bottleneck is. - Rob Pike