On Thu, 23 Jul 2009, Jakub Narebski wrote: > > BTW. Would SystemTap help there? Among contributed scripts there is > iotimes, so perhaps it would be possible to have iotrace... The problem I've had with all iotracers is that it's easy enough to get an IO trace, but it's basically almost impossible to integrate it with what actually _caused_ the IO. Using 'strace -T' shows very clearly what operations are taking a long time. It's very useful for seeing what you should not do for good performance - including IO - and where it comes from. It's just that page faults are invisible to it. Linus -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html