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Bruce Ashfield
cdb9ea2a8b
Bumping SRCREVs to pickup the following kernel commit:
[
Author: Bruce Ashfield <bruce.ashfield@gmail.com>
Date: Tue Oct 8 13:15:46 2019 +0000
signal/ptrace: fix cgroup2/freezer long runtimes
As reported in the thread: https://lkml.org/lkml/2019/10/1/789, in
kernels with commit 76f969e8948d82 [cgroup: cgroup v2 freezer], we
were seeing much longer runtime in strace/ptrace tests (4 minutes
versus 4 seconds).
The issue only manifests if CONFIG_PREEMPT is enabled, which is in
all of the default configurations.
As sugggested in the thread, the movement of preempt_enable_no_resched()
until after the cgroup is frozen returns the behaviour to pre-5.2
runtimes.
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]
With this change in place, our times are back to normal:
root@qemux86-64:~# cd /usr/lib/strace/ptest/tests
root@qemux86-64:/usr/lib/strace/ptest/tests# time ../strace -o log -qq -esignal=none -e/clock ./printpath-umovestr>ttt
real 0m3.909s
user 0m0.534s
sys 0m3.342s
This will eventually loop around via -stable, or may need future
tweaks, but it does address the immediate issue/symptom that we are
seeing, with no obvious side effects.
[YOCTO #13556]
(From OE-Core rev: 55a54aed27ffa94a235da526a39aeea59caa3417)
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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.