Viewing profile — DblPlusUngood

Yes.

In some cases, yes (if there are other runnable threads on this CPU's queue).

A better example: a page fault for a non-present page.

Don't forget gltron!

You are absolutely right. They are used everywhere in the Linux, OpenBSD, and FreeBSD kernels, and likely many other kernels. Replacing large linked lists with arrays is rarely an …

> I don't see how it could. Kernel data structures don't go on pagecache pages. Kernel data structures could end up on a pagecache page: all it takes is a reference counting bug an…

OpenBSD's choice is arguably reasonable, given their prioritization of security, since it reduces opportunities for user programs to corrupt kernel memory. What is the problem with…

What coherence is lacking? OpenBSD supports msync(2), which is the only POSIX mechanism I know of for ensuring coherency between read(2) and shared file mappings. Otherwise relying…

OpenSSH does have confirmation: use the '-c' switch to ssh-add. https://man.openbsd.org/ssh-add

Is recovery of a shared memory queue after one of the workers crashes even possible, in general? (what if the worker crashed before releasing a lock?)

Sounds like a fun project! Isn't seL4's multicore support either unverified or limited (i.e. shared memory is forbidden)? Is your platform single-threaded then?

Yes. In theory, maybe it's useful to have more flexibility to trade-off durability for performance (smaller quorum size hopefully reduces deciding latency [unless your small quorum…

Instead of an ad hominem, please clearly explain the main way that the example Go code is less safe than the C example code.

This is a great point. Jargon can be really intimidating and make the simplest statements impossible to understand for the unfamiliar. But is often trivial to learn with a little s…

A particularly tricky task with GNU make is automatically adding target dependencies on header files and handling updates to them (gcc's -M and -MMD switches). It would be great if…

How are GCs not compatible with bounded memory use? Though many GCs size allocation arenas proportionally to the live data, there is no fundamental reason why the allocation arenas…

Well, for one thing, zig apparently has no built-in memory allocator?

Turns out the x86 already has some bounds checking support; see chapter 17 in volume 1 of Intel's developer manuals and the BOUND and BND* instructions.

> I love the BSDs and especially OpenBSD for their attention to manpages. It's the main reason why I don't use Linux anymore unless I have to. I completely agree. The difference in…

1. I wouldn't say we are skeptical of Rust, I'm sure it could be made to work well and we would love to see such a Rust kernel! I do wonder whether it would be harder to implement …

Hah, I am Cody and I'm not related to Dave Cutler (as far as I know!).

Concerning your first question, that experiment is not intended to measure the cost of GC, which can be made small by trading memory. The point of this experiment is to measure the…

Well that was fast! I'm an author of this paper and would be happy to answer questions.

Different Linux kernel config options, probably. Different options can drastically affect performance.