On Mon, 15 Nov 2010 17:03:56 +0100 Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote: > On Mon, 2010-11-15 at 16:55 +0100, Martin Schwidefsky wrote: > > What we want is a low-overhead tool that precisely shows > > where the cpu spent its time (or didn't because of steal time). The > > granularity target is tenths of microseconds, something that should be > > possible with decent hardware. > > To what purpose? Is that a trick question? Why do we have tools like "top"? Or process accounting? The point is that the quality of the numbers we get right now is rather bad, the overhead of scanning /proc is horrendous and the 10ms granularity is rather coarse. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
