* Smarduch Mario-CMS063 <[email protected]> wrote:
> [...] The feature as it stands currently is divided into 3-patches -
> (i) architecture independent which by itself provides useful data (ii)
> arch dependent adds support for sys call, interrupt accounting (iii)
> arch dependent with additional features. I'm interested if it has
> potential for inclusion into the kernel, i.e. from Linux
> performance/phylisophical stand point.
more accurate accounting of scheduling and interrupt time might be
considered (especially since we already timestamp in the scheduler, so
those codepaths could be merged) - but per-syscall accounting of system
time and user time is pretty much out of the question, it's a way to hot
codepath as your own measurements show:
> [...] however there are cicumstances such as consecutive calls to
> light system calls (i.e. getpid()) where it may account for upto 7%
> overhead.
but everything will depend on the quality of the actual patches
themselves - the quality requirements are pretty strict for the affected
codepaths.
Ingo
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