Hi Linus! On 9/25/21 21:07, Linus Torvalds wrote: > On Fri, Sep 24, 2021 at 7:55 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: >> >> On each context switch we save the FPU registers on stack >> of old process and restore FPU registers from the stack of new one. >> That allows us to avoid doing that each time we enter/leave the >> kernel mode; however, that can get suboptimal in some cases. > > Do you actually have a system or virtual image to test this all out on? I have a system for testing and I can also create a QEMU VM image for tesing using the Debian Ports installation ISO for Alpha [1]. I assume Matt and Michael (CC'ed) would be able to test these improvements as well as they're working on Alpha support in the kernel. > I'm not saying this doesn't look like an improvement, I'm more > questioning whether it's worth it... Since we're still maintaining Alpha ports in Debian and Gentoo, it should be worth it, I would say. Adrian > [1] https://cdimage.debian.org/cdimage/ports/snapshots/2021-09-23/ -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
