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Proportional Integral controller-Enhanced (PIE) is a control
theoretic active queue management scheme. It is based on the
proportional integral controller but aims to control delay.
http://man7.org/linux/man-pages/man8/tc-pie.8.html
When having a service which intentionally outputs multiple equal lines,
all these messages might be inserted with the same timestamp.
journalctl has a mechanism to avoid duplicate lines, which might be in
different journal files.
This patch allows duplicate lines, if they are from the same file.
Up to now each uevent logs the following things at debug level:
- Device is queued
- Processing device
- Device processed
However when the device is queued it might still have to wait for
earlier devices to be processed before being able to start being
processed itself. When analysing logs this dependency information is
quite cruicial, so add respective debug log calls.
Add SECLABEL{selinux}="some value" cause udevadm crash
systemd-udevd[x]: Worker [x] terminated by signal 11 (SEGV)
It happens since 25de7aa7b9 (Yu Watanabe 2019-04-25 01:21:11 +0200)
when udev rules processing changed to token model. Yu forgot store
attr to SECLABEL token so fix it.
In case the dissected image has a filesystem, don't scan for partitions. This
avoids problems with services using a `RootImage=` in early boot when udevd is
not yet started.
/dev used to be mounted with "exec" flag due to /dev/MAKEDEV script but that's
history and it's now located in /sbin. mmap() with file descriptor to
"/dev/zero" (instead of modern mmap(,,,MAP_ANON...)) will still work.
ARM toolchains will sometimes optimize otherwise floating-point-free
code with floating point and SIMD instructions. This was happening with
systemd-bootarm.efi and it was causing U-Boot to crash and reset the
CPU. U-Boot does not support the ARM VFP floating point coprocessor,
which is an optional piece of hardware anyway [1].
Ensure the compiler does not generate FP/SIMD instructions by supplying
the `-mgeneral-regs-only` option when building for ARM [2].
The other option you often see to solve these problems is
`-msoft-float`, but that changes the ABI and prevents linking with
libgnuefi.
[1] https://lists.denx.de/pipermail/u-boot/2011-February/087736.html
[2] https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-mgeneral-regs-only-1
I assume it’s supposed to be “see Home Directories for details” and not
“… and embeds these JSON records directly in the home directory images …
for details”, but the previous text suggested the latter reading to me.
