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a83ecd1d45
This adds a timestamp to the start of the kernel command line. Like this (from a random system I have lying around, line truncated by me): [ 0.000000] tsc: Detected 2665.038 MHz processor [ 0.000021] Calibrating delay loop (skipped), value calculated using tim... [ 0.000023] pid_max: default: 32768 minimum: 301 [ 0.000041] ACPI: Core revision 20160831 [ 0.003782] ACPI: 2 ACPI AML tables successfully acquired and loaded This would be handy in relation to #1403. Signed-off-by: Ian Campbell <ian.campbell@docker.com>
Linux kernel builds, based on mostly-vanilla upstream Linux kernels.
See [../docs/kernel-patches.md] for how the local patches in patches-*
are maintained.
The build is mostly silent. A local build can be run via make. To view
the output use docker log -f <containerid>. The build creates multiple
containers, so multiple invocations may be necessary. To view the full build
output one may also invoke docker build . and then copy the build artefacts
from the image afterwards.
To build with various debug options enabled, build the kernel with
make DEBUG=1. The options enabled are listed in kernel_config.debug.
This allocates a significant amount of memory on boot and you may need to
adjust the kernel config on some systems. Specifically:
--- a/alpine/kernel/kernel_config
+++ b/alpine/kernel/kernel_config
@@ -415,8 +415,8 @@ CONFIG_DMI=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
-CONFIG_MAXSMP=y
-CONFIG_NR_CPUS=8192
+CONFIG_MAXSMP=n
+CONFIG_NR_CPUS=8
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set