kernel

New scheduler merged

Blog post by Paweł Dziepak on Tue, 2014-02-18 03:47
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As you undoubtedly know, my scheduler branch has been merged a month ago. Also, some important changes has been made since, including bug fixes and performance improvements. It is now time to sum up what already has been done, and show some long promised benchmark results. There are still some issues that need to be addressed, but I do not think that any of them is a major one.

Haiku meets 9th processor

Blog post by Paweł Dziepak on Fri, 2013-12-20 20:59
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It's been quite a long time since my last report so I think it is a good time to describe what I have been doing in the last two months. The main scheduler logic has been completed and now I am concentrating mainly on bug fixes, adjusting tunables and some minor improvements. I also removed gSchedulerLock, a spinlock I mentioned in my last post, and replaced it with more fine grained locking. An new interfaces for cpufreq and cpuidle modules has been created together with a cpufreq module for Intel Sandy Bridge or newer cores and cpuidle module for all processors that support C-states and invariant TSC. Furthermore, IRQs (including MSI) can be now directed to an arbitrary logical processor. Implementation of inter-processor interrupts has been improved so that it avoids acquiring any lock if it is not necessary and supports multicast interrupts. And, last but not least, 8 processor limit has been removed.

Scheduler work progress

Blog post by Paweł Dziepak on Mon, 2013-10-21 16:14
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Thanks to generosity of Haiku supporters, I will be able to continue my work on scheduler in November. It's high time I wrote a report about what has already been done. As it was mentioned before my work can be tracked in the scheduler branch in my repository. Commit descriptions and some comments in the scheduler code contain more detailed motivation behind some of the decisions I had to make. In this post, though, I will concentrate how my work looked so far and what I plan to do next.

Enhancing the scheduler

Blog post by Paweł Dziepak on Sat, 2013-09-07 20:17
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Soon I am going to work as a full-time Haiku developer on enhancing the scheduler. The goal is to improve performance of the whole system and finally deal with some long standing problems. To achieve this CPU affinity will be introduced what would make cache utilization better and I will implement scheduler strategies based on dynamic priorities what, hopefully, would once and for all deal with priority inversion. In addition to that, I want to make scheduler more power-aware. Haiku currently lacks low-level support for some of the more advanced power related features of CPUs but having scheduler ready for would save us from redesigning it later. Also, there are still ways to conserve energy without using the most recent technologies.

Retrofitting for kernel debugging

Blog post by mmu_man on Sat, 2008-07-26 20:32

Unlike BeOS, our kernel includes some pieces of C++ code, which sometimes give a headache when it comes making sense of a stack crawl from the kernel debugger, since symbols are mangled when linked into binaries, which means we must Decode__12CrypticCNamesPCc. I recalled seeing some gcc4 private API to demangle symbols into human-friendly names, but the code doing that, from libsupc++, has been written without concern for the inhabitants of the Kernel Debugging Land, using calls to malloc, realloc and free... But I still wanted to get nicer names, so I didn't give up. I also wanted to be able to get assembler dumps since not everyone has a serial cable to make use of the gdb stub.

GSoc Swap File Project

Blog post by upczhsh on Thu, 2008-05-01 05:41
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Hi everyone!
I am the GSoc student to implement the swap file support.

Haven't been here for a long time since I spent a week prepareing for the school's exam. The annoying exam ended yesterday, and now I have time to make some preparations for this summer.

I have got a basic unstanding of the Haiku vm system during the application period. In the next few days, I will investigate how paging is implemented in Linux and FreeBSD (I've stated doing that but was interrupted by the exam)and continue to work on my haiku vm tutorial. :-)

Bye,
Zhao Shuai

Haiku SVN: Kernel, Kernel, Kernel.

Blog post by eNGIMa on Mon, 2007-03-05 20:50
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Quick Updates

r19700-r19800

  • Addition of fortunes, including Haiku specific texts.
  • Tweaked thread scheduler.
  • Many VM enhancements and fixes
  • Addition of resource editing tool, resedit.
  • Addition of VMware graphics driver.
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