Notes on Andrew Morton's "State of the Kernel" at Google | LinuxWorld Community: "On instrumentation: 'I think this is a weak spot in the kernel'
'I don't think we expose enough stuff to sophisticated programmers to tell them what's going on in the kernel.'
Of the three big holes, this is probably the one with the most work going on. Morton listed quite a few high spots in instrumentation, including per-task I/O accounting and per-process memory footprint monitoring.
He also mentioned Matt Mackall's 'PSS' and 'USS' as a good step forward.
Currently IA-64 Linux has access to that platform's hardware performance counters via perfmon, and Morton says 'we'll get there eventually' for other platforms."
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