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mjg 2110fd5f63 seq: disable preemption around seq_write_*
This is a long standing performance bug which happened to not cause trouble
in practice due to rather limited use of these primitives.

The read side expects the writer to finish soon(tm) hence it loops with one
pause in-between. But it is possible the writer gets preempted in which case
the waiting can take a long time, especially so if it got preempted by the
reader. In principle this may never clean itself up.

In the current kernel seq is only used to obtain stable fp + capabilities
state. In order for looping at least once to occur there has to be a
concurrent writer modifying the fd slot for the very fd we are trying to
read. That is, for any looping to occur in the first place the program has
to be multithreaded and be doing something fishy to begin with. As such,
the indefinite looping is rather hard to run into unless you really try
(and I did not).
2018-03-28 03:15:42 +00:00
2018-03-24 04:52:29 +00:00
2018-03-27 17:17:58 +00:00
2018-03-25 07:42:44 +00:00
2018-03-27 16:38:32 +00:00
2018-03-27 17:17:58 +00:00
2018-03-27 14:54:02 +00:00
2016-09-29 06:19:45 +00:00
2017-12-19 03:38:06 +00:00
2017-12-31 16:48:04 +00:00
2018-03-20 23:08:04 +00:00
2018-03-22 11:57:59 +00:00
2018-03-02 14:42:08 +00:00

FreeBSD Source:

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

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) and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables.

The buildkernel and installkernel targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process. See build(7), config(8), and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information.

Note: If you want to build and install the kernel with the buildkernel and installkernel targets, you might need to build world before. More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used.

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.

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

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