Added summary to chapter 7

chapters/7-Overview-Of-Performance-Analysis-Tools/7-9 Chapter summary.md

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 ## Chapter Summary {.unlisted .unnumbered}
 
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+* We gave a quick overview of the most popular tools available on three major platforms: Linux, Windows and MacOS. Depending on a CPU vendor, the choice of a profiling tool will vary. For systems with an Intel processor we recommend using Vtune, for systems with an AMD processor use uProf, on Apple platforms use Xcode Instruments. 
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+* Linux perf is probably the most frequently used profiling tool on Linux. It has support for processors from all major CPU vendors. It doesn't have a graphical interface, however, there are free tools that can visualize `perf` profiling data.
 
+* We also discussed Windows Event Tracing (ETW), which is designed to observe SW dynamics in a running system. Linux has a similar tool called [KUtrace](https://github.com/dicksites/KUtrace)[^1], which we do not cover here.
 
+* Also, there are hybrid profilers that combine techniques like code instrumentation, sampling and tracing. This takes the best out of these approaches and allows user to get a very detailed information on a specific piece of code. In this chapter we looked at Tracy, which is quite popular among game developers.
 
+* Continuous profilers already become an essential tool for monitoring performance in production environments. They collect system-wide performance metrics with call stacks for days, weeks or even months. Such tools make it easier to spot the point of performance change and root cause an issue.
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+[^1]: KUtrace - [https://github.com/dicksites/KUtrace](https://github.com/dicksites/KUtrace)
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