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The MDEV-25004 test innodb_fts.versioning is omitted because ever since
commit 685d958e38b825ad9829be311f26729cccf37c46 InnoDB would not allow
writes to a database where the redo log file ib_logfile0 is missing.
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As reported in https://github.com/MariaDB/mariadb-docker/issues/338
and later https://github.com/hardkernel/linux/issues/423.
While modern kernels support this, it seems older hardware may be
stuck at kernel versions without this initialization.
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Adapted from https://github.com/google/benchmark/pull/833
authored by Sam Elliot at lowRISC.
This requires the RISCV kernel to set the CY bit of the mcountern register
which is done on Linux, but documenting here in case another OS hits
a SIGILL here.
When CY bit of the mcounteren register is unset, reading the cycle register
will cause illegal instruction exception in the next privilege level ( user
mode or supervisor mode ). See the privileged isa manual section 3.1.11 in
https://github.com/riscv/riscv-isa-manual/releases/latest
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aarch64 timer is available to userspace via arch register.
clang's __builtin_readcyclecounter is wrong for aarch64 (reads the PMU
cycle counter instead of the archi-timer register), so we don't use it.
my_rdtsc unit-test on AWS m6g shows:
frequency: 121830845
resolution: 1
overhead: 1
This counter is not strictly increasing, but it is non-decreasing.
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On clang, use __builtin_readcyclecounter() when available.
Hinted by Sergey Vojtovich. (This may lead to runtime failure
on ARM systems. The hardware should be available on ARMv8 (AArch64),
but access to it may require special privileges.)
We remove support for the proprietary Sun Microsystems compiler,
and rely on clang or the __GNUC__ assembler syntax instead.
For now, we retain support for IA-64 (Itanium) and 32-bit SPARC,
even though those platforms are likely no longer widely used.
We remove support for clock_gettime(CLOCK_SGI_CYCLE),
because Silicon Graphics ceased supporting IRIX in December 2013.
This was the only cycle timer interface available for MIPS.
On PowerPC, we rely on the GCC 4.8 __builtin_ppc_get_timebase()
(or clang __builtin_readcyclecounter()), which should be equivalent
to the old assembler code on both 64-bit and 32-bit targets.
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* Update wrong zip-code
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Extended my_timer_cycles() to support s390.
Some compiler tunings for RHEL/SLES RPM packages on s390.
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