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I think this answer has several parts: - I imagine the extra memory bandwidth of newer parts doesn't hurt. The example traces were taken on server-class Ice Lake machines. They jus…

DDIO operates mostly transparently to software, with the I/O controller feeding DMAs into a slice of L3. Hardware can opt out by setting PCIe TLP header hints, and you have some sy…

Absolutely, check out https://github.com/janestreet/magic-trace#privacy-policy and https://github.com/janestreet/magic-trace/wiki/Setting-up-a-... . With a bit of extra configurati…

Yes, in fact this is how we've been narrowing down performance problems in it and its dependencies :) - https://github.com/let-def/owee/issues/23 - https://github.com/janestreet/ma…

Absolutely! This is one of the main features of magic-trace, and in fact a primary use-case. You can select a trigger symbol for magic-trace to snapshot upon the next call of. This…

It works best on compiled programs. We do try to support scripted languages with JITs that can emit info about what symbol is located where [1]. Notably, this more or less works fo…

It's worth noting that aside from the overhead, function call / returns are not quite enough to reconstruct the callstack: tailcalls are just regular branch instructions.

We don't have plans to add ARM support largely because we have no in-house expertise with ARM. That said, ARM has CoreSight which sounds like it could support something like magic-…

You may also be interested in this wiki page: https://github.com/janestreet/magic-trace/wiki/Supported-pla... > Intel PT has a bunch of rough edges that we've tried to paper over i…

It's all OCaml, GitHub is just misclassifying it as SML :)

We have a bit more color on compatibility in general up on https://github.com/janestreet/magic-trace/wiki/How-could-mag... > for those interested.

One of the maintainers here -- it should work on Broadwell if you're not super keen on the tens-of-nanoseconds timing precision and are okay with microsecond precision (i.e. only w…

Small correction: DDIO is not limited to Intel NICs, it's a mostly-transparent-to-the-hardware mechanism by which DMAs are snooped and some fraction of the NIC-local (in the case o…

It's quite easy to get it set up once you have a VM with GPU passthrough running (for which there are plenty of guides available online) -- just a double-click installation of a se…

Yes, QXL can do that and has built-in support in e.g. virt-manager. It's not going to be fast, but it does work, and is how installation of Looking Glass can be bootstrapped withou…

(Sway dev mentioned in the article here.) To be clear, this loop doesn't exist in Sway proper: it lives in json-c, a third-party library used by a lot more than just Sway. A lockup…

He also wrote "the book" on the subject: https://wayland-book.com/

"Wayland forwarding": https://gitlab.freedesktop.org/mstoeckl/waypipe VNC: https://github.com/any1/wayvnc

Mir is a Wayland compositor. It may not have started off as one, but is today.

Xorg has had a meson build system since 2017: https://gitlab.freedesktop.org/xorg/xserver/-/commit/1549e30... Are you referring to something else?

To make the comparison closer to apples-to-apples, the Wayland analog to the Xorg server would be something like GNOME's mutter compositor, which had its first Wayland support out …

The v4l2 trick "works", but usually the application will use a lossy video codec optimized for faces, not screens. wf-recorder to v4l2 as a poor-man's screenshare to Discord ends i…

Developers willing/able to work on X11/Wayland plumbing are a (very) finite number. A single developer can have a large impact. With more of them switching their primary efforts to…

This comment is mostly correct (as a daily Wayland user), with a few exceptions. > Wayland does almost nothing besides render buffer handling. Input? Applications job. Applications…