On Mon, 2010-03-01 at 22:07 -0800, eran...@google.com wrote: > This patch adds support for randomizing the sampling period. > Randomization is very useful to mitigate the bias that exists > with sampling. The random number generator does not need to > be sophisticated. This patch uses the builtin random32() > generator. > > The user activates randomization by setting the perf_event_attr.random > field to 1 and by passing a bitmask to control the range of variation > above the base period. Period will vary from period to period & mask. > Note that randomization is not available when a target interrupt rate > (freq) is enabled. > > The last used period can be collected using the PERF_SAMPLE_PERIOD flag > in sample_type. > > The patch has been tested on X86. There is also code for PowerPC but > I could not test it.
I don't thikn we need to touch the arch code, we didn't need to for frequency driven sampling, so I don't see a reason to do so for randomization either. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
