Handle offline CPUs and CPU hotplug #3499
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First of all in case when the number CPUs change prevent out-of-bound index access in waybar::modules::CpuUsage::getCpuUsage() Secondly on Linux when updating CPU usage read /sys/devices/system/cpu/present and use it to detect the offline CPUs missing from /proc/stat For offline CPUs report 0 usage and "offline" in the tooltip Fixes issue Alexays#3498 On Linux one can test this functionality with: echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online On non-Linux OSes I'm not sure how to detect offline CPUs, so I didn't add the offline CPU detection there but at least CPU number change should not cause a crash there anymore or cause memory safety issues after this fix
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edit: fix forgot clang-format |
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LGTM, thx |
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First of all in case when the number CPUs change
prevent out-of-bound index access in
waybar::modules::CpuUsage::getCpuUsage()
Secondly on Linux when updating CPU usage
read /sys/devices/system/cpu/present
and use it to detect the offline CPUs missing from /proc/stat
For offline CPUs report 0 usage and "offline" in the tooltip
Fixes issue #3498
On Linux one can test this functionality with:
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online
On non-Linux OSes I'm not sure how to detect offline CPUs, so I didn't add the offline CPU detection there
but at least CPU number change should not cause a crash there anymore or cause memory safety issues after this fix