Find a file
Bruce Evans 23e5e43ccd Finish the fix for overflow in calcru1().
The previous fix was unnecessarily very slow up to 105 hours where the
simple formula used previously worked, and unnecessarily slow by a factor
of about 5/3 up to 388 days, and didn't work above 388 days.  388 days is
not a long time, since it is a reasonable uptime, and for processes the
times being calculated are aggregated over all threads, so with N CPUs
running the same thread a runtime of 388 days is reachable after only
388 / N physical days.

The PRs document overflow at 388 days, but don't try to fix it.

Use the simple formula up to 76 hours.  Then use a complicated general
method that reduces to the simple formula up to a bit less than 105
hours, then reduces to the previous method without its extra work up
to almost 388 days, then does more complicated reductions, usually
many bits at a time so that this is not slow.  This works up to half
of maximum representable time (292271 years), with accumulated rounding
errors of at most 32 usec.

amd64 can do all this with no avoidable rounding errors in an inline
asm with 2 instructions, but this is too special to use.  __uint128_t
can do the same with 100's of instructions on 64-bit arches.  Long
doubles with at least 64 bits of precision are the easiest method to
use on i386 userland, but are hard to use in the kernel.

PR:		76972 and duplicates
Reviewed by:	kib
2019-02-14 19:07:08 +00:00
bin sh: Restore $((x)) error checking after fix for $((-9223372036854775808)) 2019-02-10 22:23:05 +00:00
cddl Create new EINTEGRITY error with message "Integrity check failed". 2019-01-17 06:35:45 +00:00
contrib Pull in r353907 from upstream llvm trunk (by Reid Kleckner): 2019-02-13 20:13:40 +00:00
crypto scp: disallow empty or current directory 2019-01-15 15:35:14 +00:00
etc mtree: Add dtb subdir to the mtree file 2019-02-07 18:54:25 +00:00
gnu Create crtsavres.o for powerpc builds 2019-01-12 21:29:54 +00:00
include Use a private definition of osockaddr rather then relying on type 2019-01-18 21:30:06 +00:00
kerberos5 Use ${SRCTOP}/contrib/com_err/com_err.h instead of the installed com_err.h. 2019-01-14 06:34:54 +00:00
lib Unify i386 and amd64 getcontextx.c, and use ifuncs while there. 2019-02-14 14:02:33 +00:00
libexec Teach /etc/rc.d/growfs how to handle systems running ZFS. 2019-02-08 19:19:31 +00:00
release release: arm64: pine64-lts: Use the newly created u-boot-pine64-lts port 2019-02-04 18:30:47 +00:00
rescue rescue: set NO_SHARED in Makefile 2018-11-19 22:18:18 +00:00
sbin Fix up concurrent test zpool setup and teardown 2019-02-12 23:35:46 +00:00
secure Enable devcryptoeng for OpenSSL. 2018-12-12 21:56:47 +00:00
share Add rc.resume(8) alias for rc(8) to fix the manpage cross references 2019-02-12 23:33:16 +00:00
stand Allow reading the UEFI variable size 2019-02-08 14:56:28 +00:00
sys Finish the fix for overflow in calcru1(). 2019-02-14 19:07:08 +00:00
targets retire LINKER_FEATURES filter flag 2018-11-12 20:44:22 +00:00
tests pf tests: Check size validation in DIOCGETSRCNODES 2019-01-22 02:56:36 +00:00
tools Mention clang-format in WITH_CLANG_EXTRAS 2019-02-07 14:05:21 +00:00
usr.bin Implement Address Space Layout Randomization (ASLR) 2019-02-10 17:19:45 +00:00
usr.sbin Revert r343077 until the license issues surrounding it can be resolved. 2019-02-12 19:05:09 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.gitattributes MK_ZFS -> {MK_ZFS|MK_LOADER_ZFS}, this is so we can diable userland / kernel 2019-01-05 22:45:20 +00:00
.gitignore Ignore _.universe-toolchain file. 2018-07-01 13:50:37 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Register a pre-commit review for ipfilter. 2018-12-24 01:12:22 +00:00
Makefile Update comment about 'universe' disk usage 2018-11-10 19:09:48 +00:00
Makefile.inc1 Remove iBCS2: plug a wart missed in r342242 2018-12-19 22:08:51 +00:00
Makefile.libcompat Use ...-freebsd13.0 in -target strings. 2018-11-12 16:55:20 +00:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc New pfil(9) KPI together with newborn pfil API and control utility. 2019-01-31 23:01:03 +00:00
README Import OpenSSL 1.1.1a. 2018-11-20 18:59:41 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
UPDATING Fix small typo. 2019-02-14 17:04:04 +00:00

FreeBSD Source:

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