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We've seeing issues where IO load appears to cause strange failures due to timeouts within qemu. One theory for these is that it is is hitting hard page faults at in-opportune moments which cause timing problems within the VM. This patch is a bit of a hack which tries to ensure the data is paged in at a point when we know we can take the time delays (waiting for the QMP start signal). Whilst this isn't ideal, it does seem to improve things on the autobuilder and shouldn't harm anything. The code figures out which files to read my looking at the mmap'd files the process has open from /proc. On Centos7 systems these files are not user readable, if that is the case we just skip them. (From OE-Core rev: e77844314d09ceff9c22338d366519928f4f7284) 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.