Tookmund
commented
2 years ago Oh I had not heard about that! Would definitely be more efficient than polling every second but would require rethinking pretty much the entire system of deciding when to allocate new swapfiles as Swapspace currently try to do so before the system has memory problems.
Happy to consider patches of course but unfortunately it’s significant enough of a change that I’m not sure I will have the time to work on it anytime soon.
Jacob
On Jul 1, 2021, at 09:19, Holger Hoffstätte @.***> wrote:
Linux PSI (Pressure Stall Information) is a recent addition to the Linux kernel which allows to be notified about all sorts of resource pressure, so that countermeasures can be taken as soon as possible. Right now Swapspace polls /proc every second and does the necessary pressure evaluation by itself. It might be more accurate to use PSI for this, and maybe replace polling with being notified (fewer wakeups?). Great article with examples: https://unixism.net/2019/08/linux-pressure-stall-information-psi-by-example/
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Linux PSI (Pressure Stall Information) is a recent addition to the Linux kernel which allows a userspace client to be notified about all sorts of resource pressure, so that countermeasures can be taken as soon as possible. Right now Swapspace polls /proc every second and does the necessary pressure evaluation by itself. It might be more accurate to use PSI for this, and maybe replace polling with being notified (fewer wakeups?). Great article with examples: https://unixism.net/2019/08/linux-pressure-stall-information-psi-by-example/