freebsd with flexible iflib nic queues
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Konstantin Belousov 146fc63fce Add a way to manage thread signal mask using shared word, instead of syscall.
A new syscall sigfastblock(2) is added which registers a uint32_t
variable as containing the count of blocks for signal delivery.  Its
content is read by kernel on each syscall entry and on AST processing,
non-zero count of blocks is interpreted same as the signal mask
blocking all signals.

The biggest downside of the feature that I see is that memory
corruption that affects the registered fast sigblock location, would
cause quite strange application misbehavior. For instance, the process
would be immune to ^C (but killable by SIGKILL).

With consumers (rtld and libthr added), benchmarks do not show a
slow-down of the syscalls in micro-measurements, and macro benchmarks
like buildworld do not demonstrate a difference. Part of the reason is
that buildworld time is dominated by compiler, and clang already links
to libthr. On the other hand, small utilities typically used by shell
scripts have the total number of syscalls cut by half.

The syscall is not exported from the stable libc version namespace on
purpose.  It is intended to be used only by our C runtime
implementation internals.

Tested by:	pho
Disscussed with:	cem, emaste, jilles
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D12773
2020-02-09 11:53:12 +00:00
bin Remove unused include. 2020-02-02 20:51:28 +00:00
cddl [PowerPC] [DTrace] Add ELFv2 support in libdtrace 2020-02-05 19:39:48 +00:00
contrib MFV r357687: Import NFS fix for O_SEARCH tests 2020-02-09 04:05:30 +00:00
crypto sshd: make getpwclass wrapper MON_ISAUTH not MON_AUTH 2019-11-20 16:30:37 +00:00
etc pkgbase: fix caroot packaging and add post-install script 2020-01-29 18:47:08 +00:00
gnu remove stale gnu/lib/csu directory 2020-02-03 13:50:15 +00:00
include libc: provide fputc_unlocked 2020-02-02 19:45:12 +00:00
kerberos5 Update Makefile.depend files 2019-12-11 17:37:53 +00:00
lib Add a way to manage thread signal mask using shared word, instead of syscall. 2020-02-09 11:53:12 +00:00
libexec auditd_stop: wait_for_pids instead of sleeping 2020-02-06 08:32:30 +00:00
release RPI3: Add RPi4 firmware files to the FAT partition 2020-01-31 15:56:08 +00:00
rescue Remove unused defines since r147075 2019-07-12 04:44:50 +00:00
sbin No need to make sunlabel anymore 2020-02-06 17:52:02 +00:00
secure pkgbase: fix caroot packaging and add post-install script 2020-01-29 18:47:08 +00:00
share netmap: improve netmap(4) and vale(4) man pages 2020-02-07 19:26:26 +00:00
stand followup on r357497: clean obsolete comment and use shift instead of multiplication 2020-02-05 13:08:24 +00:00
sys Add a way to manage thread signal mask using shared word, instead of syscall. 2020-02-09 11:53:12 +00:00
targets retire BSD_CRTBEGIN option 2020-01-31 18:04:04 +00:00
tests tests: epair: Don't fail if we load if_epair 2020-02-01 19:40:11 +00:00
tools Update WITH_/WITHOUT_BINUTILS_BOOTSTRAP descriptions 2020-02-06 14:13:33 +00:00
usr.bin Miscellaneous typo fixes 2020-02-07 19:53:07 +00:00
usr.sbin Miscellaneous typo fixes 2020-02-07 19:53:07 +00:00
.arcconfig
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml Cirrus-CI: add make packages to CI test 2020-01-19 22:29:22 +00:00
.clang-format Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitattributes Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitignore .gitignore: Add LINT kernel configurations generated into SRCDIR 2019-08-10 18:22:22 +00:00
COPYRIGHT Happy New Year 2020! 2019-12-31 16:01:36 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Move all sources from the llvm project into contrib/llvm-project. 2019-12-20 19:53:05 +00:00
Makefile Per the firm plan, start to remove sparc64 2020-02-02 11:37:27 +00:00
Makefile.inc1 Restore missing comment 2020-02-06 17:51:48 +00:00
Makefile.libcompat libcompat: build 32-bit rtld and ldd as part of "everything" 2019-11-07 22:58:10 +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 Remove elf2aout 2020-02-06 17:52:16 +00:00
README README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
RELNOTES Add elf2aout removal 2020-02-06 18:00:50 +00:00
UPDATING Add notes for MAKE_OBSOLETE_GCC going away and riscv switching to clang/lld. 2020-01-08 17:31:54 +00:00

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.

Source Roadmap:

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

gnu		Various commands and libraries under the GNU Public License.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

stand		Boot loader sources.

sys		Kernel sources.

sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
		used in release builds. NOTES contains documentation of
		all possible entries.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html