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sys-kernel: enable BPF_JIT, POWER_SUPPLY, overlayfs options#691
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November 17, 2020 15:01
CONFIG_BPF_JIT_ALWAYS_ON enables BPF JIT and removes BPF interpreter to avoid speculative execution of BPF instructions by the interpreter. See also flatcar/Flatcar#185.
CONFIG_POWER_SUPPLY enables power supply class used to represent battery, UPS, AC or DC power supply properties to user-space. It defines core set of attributes, which should be applicable to most power supplies out there. See also flatcar/Flatcar#215.
Enable CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed. Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation. Enable CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line. When turned on, overlayfs will copy up directory first, before the actual contents. See also flatcar/Flatcar#170
This was referenced Nov 17, 2020
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Enable the following kernel configs.
CONFIG_BPF_JIT_ALWAYS_ONenables BPF JIT and removes BPF interpreter to avoid speculative execution of BPF instructions by the interpreter.CONFIG_POWER_SUPPLYenables power supply class used to represent battery, UPS, AC or DC power supply properties to user-space.It defines core set of attributes, which should be applicable to most power supplies out there.
CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed.Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation.
CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line.When turned on, overlayfs will copy up directory first, before the actual contents.
Fixes flatcar/Flatcar#185
Fixes flatcar/Flatcar#215
Fixes flatcar/Flatcar#170
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Testing done
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