EMPER's Runtime now installs the SIGSEGV handler that checks if the
segmentation fault was caused by hitting the guard page. If the guard
page was hit, then the handler prints an error message.

Also make ContextOutOfBoundsTest more robust by not creating an
infinite recursion, which may be optmized out by the compiler.

Thanks to Nicolas Pfeiffer for writing the initial prototypical
implementation of continuation stealing and the cactus stack
mechanism, on which this is based.

Co-authored-by: Nicolas Pfeiffer <pfeiffer@cs.fau.de>

std::localtime takes a global lock and is therefore not scalable and
inapplicable for analyzing timing sensible bugs.
Introduce a new option to add UTC timestamps. This allows on my system
to double the CPU load while using mmapped logging.

Also increase the LogBuffer size from 1MB to 1GB because I had some
crashes where a renewed buffer was still used.

This adds an option to make the scheduling parameters of the completer
thread configurable via a meson option.

Florian Fischer authored 4 years ago and Florian Schmaus committed 4 years ago

Modified-by: Florian Schmaus <flow@cs.fau.de>

Florian Fischer authored 4 years ago and Florian Schmaus committed 4 years ago

On our bigboxes the build failed because both liburing.h and
linux/time_types.h define struct __kernel_time_spec.
The linux headers were added because of iwyu and are not unnecessary.

Modified-by: Florian Schmaus <flow@cs.fau.de>

This also changes emper_log so that a std::ostringstream is used to
assemble the log message.

The default flavor is the preferred way to use the userspace library it uses
the sys_membarrier syscall or falls back to using userspace membarriers.

This adds the liburcu dependency which must be installed regardless the
'liburcu' meson option.