Git 2.22.0 to be Released

74 developers made 745 changes to the new version of popular tool
10 June 2019   571

The release of the version control system Git 2.22.0 is presented. Git is one of the most popular, reliable and high-performance version control systems, providing flexible non-linear development tools based on branching and merging branches. 

Compared to the previous release, 745 changes were made to the new version, prepared with by of 74 developers, of which 18 took part in the development for the first time. Major innovations:

  • New transfer mode for the commit set "git rebase --rebase-merges" available since release 1.18 replaced with old option "--preserve-merges", which is now marked obsolete.
  • Support for creating a new branch based on the result of determining the merge base of two other branches (merge base, linking to a common ancestor) using the "git branch new A ... B" and "git checkout -b new A ... B" constructs, in which "A ... B" implies the definition of a merge base between two specified commits, similar to the way "git checkout A ... B" shifts HEAD to the base commit and "diff A ... B" shows the changes between with commit "B" and common with commit "A" ancestor has been added.
  • "git branch --show-current" added to display the name of the branch obtained during the checkout operation;

Get more info at Github and official Github's blog

Linux 5.3 Kernel to be Released

Huge amount of updates, improvements, changes and new features awaits all Linux users
17 September 2019   258

After two months of development, Linus Torvalds introduced the Linux 5.3 kernel release. Among the most notable changes: support for AMD Navi GPUs, Zhaoxi processors, and Intel Speed ​​Select power management technology, the ability to use umwait instructions to wait without using loops, increasing the interactivity utilization clamping mode for asymmetric CPUs, the pidfd_open system call, the ability to use IPv4 addresses from the subnet 0.0.0.0/8, the possibility of hardware acceleration of nftables, support for HDR in the DRM subsystem, integration of the ACRN hypervisor.

In the announcement of the new release, Linus reminded all developers of the main rule of kernel development - maintaining the invariance of behavior for user space components. Changes in the kernel should in no way violate already running applications and lead to user-level regressions. At the same time, a violation of behavior can cause not only a change in the ABI, removal of outdated code or errors, but also an indirect effect of correctly working useful improvements. As a good example, the useful optimization in Ext4 code was discarded, which reduces the number of accesses to the drive by disabling the read-ahead inode table for small I / O requests.

Optimization has led to the fact that, due to a decrease in disk activity, the entropy for the random number generator getrandom () began to accumulate more slowly and in some configurations, under certain circumstances, there could be hangs during loading until the entropy pool is full. Since the optimization is really useful, a discussion arose among the developers, in which it was proposed to eliminate the problem by disabling the default blocking mode of the getrandom () call with the addition of an optional flag to wait for entropy, but such a change will affect the quality of random numbers at the initial stage of loading. In the change rollback commit, Linus noted that he plans to bring the optimization back as soon as the problem with getrandom () is resolved.

The new version adopted 15794 patches from 1974 developers, the patch size is 92 MB (the changes affected 13986 files, 258419 lines of code were added, 599137 lines were deleted). About 39% of all the changes presented in 5.3 are related to device drivers, about 12% of changes are related to updating the code specific to hardware architectures, 11% are connected to the network stack, 3% to file systems and 3% to internal kernel subsystems.

Get more information about the new features and from the mailing.