On Thu, Dec 19, 2013 at 04:54:27PM +0200, Alexander Shishkin wrote: > Peter Zijlstra <pet...@infradead.org> writes: > > > On Thu, Dec 19, 2013 at 12:57:59PM +0100, Peter Zijlstra wrote: > > So you're basically forced to stop the tracing on PMI anyhow; so your > > continuous tracing argument goes out the window. > > It's only stopped inside the PMI handler to set up another buffer, and > is then started again, so no useful trace is lost. PMI handler is not > traced. What you're proposing is stopping it for good till perf collects > the previous data, which will lose us a lot of trace. So my argument > stands.
That is not what I proposed at all. The PMI will swizzle the pages and resume recording. If there is no space in the output buffer, we'll simply re-use the existing pages and overwrite data. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/