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Linux Kernel and Linux Foundation Miscellany

Submitted by Roy Schestowitz on Friday 21st of August 2020 12:36:19 AM Filed under
Linux
  • 5.9 Merge window, part 1

    As of this writing, just over 3,900 non-merge changesets have been pulled into the mainline repository for the 5.9 kernel development cycle. While this merge window has just begun, there is already a significant set of new features to point out.

  • Local locks in the kernel

    The Linux kernel has never lacked for synchronization primitives and locking mechanisms, so one might justifiably wonder why there might be a need to add another one. The addition of local locks to 5.8 provides an answer to that question. These locks, which have their origin in the realtime (PREEMPT_RT) tree, were created to solve some realtime-specific problems, but they also bring some much-needed structure to a common locking pattern used in non-realtime kernels as well.

    [...]

    A kernel function attempting to acquire a spinning lock that is owned by another thread will spin (loop actively) until the other thread, which must be running on a different CPU, releases the lock. This type of lock is fast, but it may waste CPU cycles if the wait lasts for a long time. Spinning locks are thus used around short sections of code. Longer code sections protected by spinning locks will increase the overall system latency; code that needs to respond to an event quickly may be blocked on a lock. The category of spinning locks contains spinlocks and read-write locks.

    The situation is different with sleeping locks; a thread taking such a lock will, as the name suggests, relinquish the CPU if it cannot obtain the lock. This type of lock works for longer sections of critical code, but takes a longer time to obtain. Also, sleeping locks cannot be taken when a thread is running in atomic context; that happens, for example, when interrupts are disabled, the code holds a spinlock, or it holds an atomic kmap (atomic kernel mapping). In non-PREEMPT_RT kernels, sleeping locks include all types of mutexes and semaphores. In practice, even sleeping locks do spinning in some cases if there is a possibility to obtain the lock rapidly. For example, mutexes may spin if the mutex owner is running (and thus should release the mutex shortly). This is called "opportunistic spinning"; interested readers can look into the details in the kernel documentation.

  • Linux Plumbers Conference: How to Join Virtual LPC 2020

    A reminder about how to attend our virtual edition of the Linux Plumbers Conference.

    If you are registered, you can participate by joining the Meeting Rooms on our Big Blue Button instance, starting Monday August 24th. You will find a front end showing the schedule for the current day with all the active sessions you can join. If you are having issues, please consult the LPC 2020 Participant Guide.

  • Linux Foundation Newsletter: August 2020
  • Linux Foundation launches new community for finance professionals

    The Linux Foundation is today announcing the formation of the FinOps Foundation to promote the discipline of cloud financial management through best practices, education, and standards

    With support from founding members Apptio, Cloudeasier, Cloudsoft, CloudWize, Contino, Kubecost, Neos, Opsani, ProsperOps, Timspirit and VMware, the foundation is set to increase awareness and offer education for professionals in the emerging discipline of FinOps.

  • FinOps Foundation Quickly Gains Industry-Wide Support to Advance Cloud Financial Management and Education

    The Linux Foundation, the nonprofit organization enabling mass innovation through open source, today announced the formation of the FinOps Foundation to advance the discipline of cloud financial management through best practices, education and standards. The Linux Foundation announced an intent to form the FinOps Foundation at Open Source Summit North America in late June. Today it’s announcing formation and support from founding members Apptio, Cloudeasier, Cloudsoft, CloudWize, Contino, Kubecost, Neos, Opsani, ProsperOps, Timspirit and VMware.

  • FinOps Foundation To Advance Cloud Financial Management And Education
»

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