So, I've been looking to get kernel shark onto gentoo, for a long time....[1] Look at this link to wet your appetite!
KernelShark(gui) is a very, very functional way to look at just about every aspect of kernel performance. It needs trace-cmd to run. Guess what just made it into the portage tree? (dev-util/trace-cmd) THANKS to Patrick McLean <chutz...@gentoo.org>! You'll have to make some adjustments to your kernel settings (maybe) to activate ftrace. I wrote extensively about KernelShark/trace-cmd/ftrace in this bug, which is still looking for a gentoo dev to complete (please?). BGO 517428. Now to wet those appetites, look here [2,3] at section 3.7 and 3.8. It seems our 'pals' at RedHat offer there most optimized servers that are extremely tweaked in the kernel (real-time) by using these tools; particularly for their cluster offerings that cost big_bucks. [2] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_ MRG/1.3/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide- Realtime_Specific_Tuning-Using_the_ftrace_Utility_for_Tracing_Latencies.html [3] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_ MRG/1.3/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide- Realtime_Specific_Tuning-Latency_Tracing_Using_trace_cmd.html MRG (messaging, realtime, grid) version guide 1.3 has tons of performance tuning ideas for servers that are well worth a glance. If you just want the pdf, search for: Red_Hat_Enterprise_MRG-1.3-Realtime_Tuning_Guide-en-US.pdf KernelShark on top of trace-cmd using ftrace activated in the kernel, is one bad ars tool; so as soon as some sympathetic dev (ebuild hacker) puts together an ebuild (overlay is fine) for KernelShark, we be jammin on da kernel optimizations! It'll even allow folks to evaluate ram performance with a real timing chart style data sets. TEQUILA! for all my pals........ enjoy, James repeated from BGO-517428! [1] https://www.kernel.org/doc/Documentation/trace/ftrace.txt [2] http://lwn.net/Articles/410200/ [3] http://www.linux-kvm.org/page/Tracing [4] http://git.kernel.org/cgit/linux/kernel/git/rostedt/trace-cmd.git [5] http://rostedt.homelinux.com/kernelshark/ [6] http://pkgs.org/download/kernelshark [7] http://www.youtube.com/watch?v=ABRtzVtUVBo [8] http://crtags.blogspot.com/2012/04/dtrace-ftrace-ltrace-strace-so-many-to.html [9] https://wiki.linaro.org/LEG/Engineering/TOOLS/tracing-and-profiling-tools#ftrace
