On Wed, Mar 06, 2013 at 09:52:16PM -0300, Marcelo Tosatti wrote: > On Wed, Mar 06, 2013 at 10:29:12AM -0600, Michael Wolf wrote: > > I looked at doing that once but was told that I was changing the > > interface in an unacceptable way, because now I was not reporting all of > > the elapsed time. I agree it would make things simpler. > > Pointer to that claim, please?
Back in about 2004 or 2005 or so I was looking at changing how user and system times were calculated (in the context of trying to find a better way to report resources used by a thread in an SMT processor). I found that utilities such as top expected the deltas in the /proc/stat numbers to add up to elapsed time, and would report strange and inconsistent results if that wasn't the case. Unfortunately at this distance I don't recall the exact details. I don't know whether the expectation that the deltas in the /proc/stat numbers over a period of time add up to the elapsed real time is documented anywhere, but I wouldn't be at all surprised if some programs depend on it, so it's better to maintain that property. Paul. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
