Messages in this thread | | | Subject | Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events | From | Valdis.Kletnieks@vt ... | Date | Wed, 05 Aug 2009 11:07:19 -0400 |
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On Tue, 04 Aug 2009 13:18:18 PDT, Andrew Morton said:
> As usual, we're adding tracepoints because we feel we must add > tracepoints, not because anyone has a need for the data which they > gather.
One of the strong points of the Solaris 'dtrace' is that the kernel comes pre-instrumented with zillions of tracepoints, including a lot that don't seem to have very much application - just so they're already in place in case you hit some weird issue and need the tracepoint for an ad-crock dtrace script to debug something. So when I'm trying to diagnose why my backup server suddenly got sluggish 3 terabytes into a 5 terabyte backup, and it looks like some weird fiberchannel issue, I can collect data without having to reboot to install a tracepoint (which would lose the backup, and possibly reset the issue or otherwise make it go into hiding).
Just sayin'. :) [unhandled content-type:application/pgp-signature] | |