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232cb7b055
We have a working theory that IO queues on the autobuilder are impacting runtime testing under qemu, particularly async writes which inice does not influence. We already pass the snapshot option to qemu which copies the image and runs out of the copy. Add in the ability to copy the image to a specificed location which can be a tmpfs. This means that writes to the image would no longer be blocked by other writes to disk in the system. Preliminary tests show that this does improve the qemu errors at the expense of sometimes showing qemu startup timeouts as on a loaded system with a large test image, it can take longer than 120s to copy the image to tmpfs. Having a most consistent failure mode for loaded tests is probably desireable though. (From OE-Core rev: fd1c26ab426c3699ffd8082b83d65a84c8eb8bff) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.