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Haiqing Bai 6d77529d62 unfs3: fixed the issue that unfsd consumes 100% CPU
The 'accept' function on the socket of unfsd daemon
is always in below error state:
accept(4, 0x7ffd5e6dddc0, [128]) = -1 EINVAL (Invalid argument)
accept(6, 0x7ffd5e6dddc0, [128]) = -1 EINVAL (Invalid argument)

And 'strace -c -p <the pid of unfsd>' shows:
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 70.87    0.005392           0    513886    513886 accept
 29.13    0.002216           0    256943           poll

This error state is in the 'for' loop of the daemon, so it consumes 100%
CPU. The reason is that 'listen' is not called for the TCP socket before
'accept'. Actually the called 'svc_tli_create' from libtirpc will not call
'listen' on a bound socket.

(From OE-Core rev: 1f6784d2e839f81749d21ad1b615a9f7bb0e64d6)

Signed-off-by: Haiqing Bai <Haiqing.Bai@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-10-28 05:31:42 +00:00

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.
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