[$] task_diag and statx()

The interfaces supported by Linux to provide access to information aboutprocesses and files have literally been around for decades. One mightthink that, by this time, they would have reached a state of relativeperfection. But things are not so perfect that developers are deterredfrom working on alternatives; the motivating factor in the two casesstudied here is the same: reducing the cost of getting information out ofthe kernel while increasing the range of information that is available.<p>Click below (subscribers only) for the full article from this week's KernelPage.