Deprecating scp [LWN.net]
The scp command, which uses the SSH protocol to copy files between machines, is deeply wired into the fingers of many Linux users and developers — doubly so for those of us who still think of it as a more secure replacement for rcp. Many users may be surprised to learn, though, that the resemblance to rcp goes beyond the name; much of the underlying protocol is the same as well. That protocol is s
Supporting Linux kernel development in Rust
August 31, 2020 This article was contributed by Nelson Elhage LPC The Rust programming language has long aimed to be a suitable replacement for C in operating-system kernel development. As Rust has matured, many developers have expressed growing interest in using it in the Linux kernel. At the 2020 (virtual) Linux Plumbers Conference, the LLVM microconference track hosted a session on open questio
Flushing out pdflush [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The kernel page cache contains in-memory copies of data blocks belonging to files kept in persistent storage. Pages which are written to by a processor, b
PEP 572 and decision-making in Python [LWN.net]
The "PEP 572 mess" was the topic of a 2018 Python Language Summit session led by benevolent dictator for life (BDFL) Guido van Rossum. PEP 572 seeks to add assignment expressions (or "inline assignments") to the language, but it has seen a prolonged discussion over multiple huge threads on the python-dev mailing list—even after multiple rounds on python-ideas. Those threads were often contentious
Guido van Rossum resigns as Python leader [LWN.net]
Python creator and Benevolent Dictator for Life Guido van Rossum has decided, in the wake of the difficult PEP 572 discussion, to step down from his leadership of the project. "Now that PEP 572 is done, I don't ever want to have to fight so hard for a PEP and find that so many people despise my decisions. I would like to remove myself entirely from the decision process. I'll still be there for a w
A Python static typing update [LWN.net]
One of the larger features added to Python over the last few releases is support for static typing in the language. Static type-checking and tools to support it show up frequently as topics at the Python Language Summit (PLS) and this year was no exception. Mypy developers Jukka Lehtosalo and Ivan Levkivskyi gave an update on static typing at PLS 2018. Lehtosalo started things off by talking about
Ensuring data reaches disk [LWN.net]
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. In a perfect world, there would be no operating system crashes, power outages or disk failures, and programmers wouldn't have to w
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That massive filesystem thread - LWN.net
Long, highly-technical, and animated discussion threads are certainly not unheard of on the linux-kernel mailing list. Even by linux-kernel standards, though, the thread that followed the 2.6.29 announcement was impressive. Over the course of hundreds of messages, kernel developers argued about several aspects of how filesystems and block I/O work on contemporary Linux systems. In the end (your ed
ext4 and data loss [LWN.net]
The ext4 filesystem offers a number of useful features. It has been stabilizing quickly, but that does not mean that it will work perfectly for everybody. Consider this example: Ubuntu's bug tracker contains an entry titled "ext4 data loss", wherein a luckless ext4 user reports: Today, I was experimenting with some BIOS settings that made the system crash right after loading the desktop. After a c
CoreOS looks to move from Btrfs to overlayfs [LWN.net]
After many years of different union filesystem implementations trying to get into the mainline, the overlay filesystem (also known as overlayfs) was finally merged for 3.18. It didn't take all that long for at least one project to notice and react to that addition. CoreOS, which is a Linux distribution for large server deployments, is now planning to move its root filesystem images from Btrfs to e
Sharing pages between mappings [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! In the memory-management subsystem, the term "mapping" refers to the connection between pages in memory and their backing store — the file that represents
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Which I/O controller is the fairest of them all? [LWN.net]
An I/O controller is a system component intended to arbitrate access to block storage devices; it should ensure that different groups of processes get specific levels of access according to a policy defined by the system administrator. In other words, it prevents I/O-intensive processes from hogging the disk. This feature can be useful on just about any kind of system which experiences disk conten
What is RCU, Fundamentally? [LWN.net]
December 17, 2007 This article was contributed by Paul McKenney [Editor's note: this is the first in a three-part series on how the read-copy-update mechanism works. Many thanks to Paul McKenney and Jonathan Walpole for allowing us to publish these articles. The remaining two sections will appear in future weeks.] Part 1 of 3 of What is RCU, Really? Paul E. McKenney, IBM Linux Technology Center Jo
Block/SCSI Data Integrity Support [LWN.net]
This is the first take of my data integrity patches. It's quite hard to explain everything in a brief couple of paragraphs but I'll try. There's more information to be found in the docs section at: http://oss.oracle.com/projects/data-integrity/ Here's the executive summary: What's This All About? ---------------------- These patches allow data integrity information (checksum and more) to be attach
Block layer introduction part 2: the request layer [LWN.net]
November 9, 2017 This article was contributed by Neil Brown The Linux block layer provides an upstream interface to filesystems and block-special devices allowing them to access a multitude of storage backends in a uniform manner. It also provides downstream interfaces to device drivers and driver-support frameworks that allow those drivers and frameworks to receive requests in a manner most suita
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The Linux "copy problem" [LWN.net]
Dynamic writeback throttling [LWN.net]
Versioned pointers: a new method of representing snapshots [LWN.net]
ext4 and data consistency [LWN.net]
A generic hash table [LWN.net]