Peter, On Wed, Feb 11, 2015 at 6:39 AM, Peter Zijlstra <[email protected]> wrote: > On Wed, Feb 11, 2015 at 12:42:41AM +0100, Stephane Eranian wrote: >> To enable synchronization of the runtime MMAPs with those recorded by >> the kernel on behalf of the perf tool, the runtime needs to timestamp >> any record in the dump file using the same time source. The current >> patch series is relying on Sonny Rao's posix-clock patch series >> posted on LKML in 2013. The link to the patches is: >> https://lkml.org/lkml/2013/12/6/1044 >> > > At least for x86 you could use something like this: > > > lkml.kernel.org/r/aa2dd2e4f1e9f2225758be5ba00f14d6909a8ce1.1423180257.git.s...@fb.com > > We can re-create the perf_clock() from the tsc with the mult, shift and > offset provided in the perf userpage.
I had forgotten that I had modified Sonny's patch to use sched_clock(). I will post V2 using David Ahern's driver instead. But, we need a portable solution, there are jitted environment on other architectures. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
