From f03e05310642b1dd13a83f45b7e1b7b14602512e Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 1 Dec 2015 08:48:35 +0100 Subject: misc improvements MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- .gitignore | 4 +- Makefile | 75 ++++---- README | 50 ++++- doc/info/fdl.texinfo | 505 +++++++++++++++++++++++++++++++++++++++++++++++++ doc/info/slack.texinfo | 143 ++++++++++++++ info/fdl.texinfo | 505 ------------------------------------------------- info/slack.texinfo | 143 -------------- 7 files changed, 737 insertions(+), 688 deletions(-) create mode 100644 doc/info/fdl.texinfo create mode 100644 doc/info/slack.texinfo delete mode 100644 info/fdl.texinfo delete mode 100644 info/slack.texinfo diff --git a/.gitignore b/.gitignore index ee4b6c0..ea50549 100644 --- a/.gitignore +++ b/.gitignore @@ -1,6 +1,6 @@ _/ -bin/ -obj/ +/bin/ +/obj/ .* !.git* *~ diff --git a/Makefile b/Makefile index 7342f27..8569981 100644 --- a/Makefile +++ b/Makefile @@ -5,37 +5,40 @@ # The package path prefix, if you want to install to another root, set DESTDIR to that root. -PREFIX ?= /usr +PREFIX = /usr # The binary path excluding prefix. -BIN ?= /bin +BIN = /bin # The resource path excluding prefix. -DATA ?= /share +DATA = /share # The binary path including prefix. -BINDIR ?= $(PREFIX)$(BIN) +BINDIR = $(PREFIX)$(BIN) # The resource path including prefix. -DATADIR ?= $(PREFIX)$(DATA) +DATADIR = $(PREFIX)$(DATA) # The generic documentation path including prefix -DOCDIR ?= $(DATADIR)/doc +DOCDIR = $(DATADIR)/doc # The info manual documentation path including prefix -INFODIR ?= $(DATADIR)/info +INFODIR = $(DATADIR)/info # The license base path including prefix. -LICENSEDIR ?= $(DATADIR)/licenses +LICENSEDIR = $(DATADIR)/licenses # The name of the package as it should be installed. -PKGNAME ?= slack +PKGNAME = slack # The name of the command as it should be installed. -COMMAND ?= slack +COMMAND = slack # Build rules. .PHONY: default -default: command info shell +default: base info shell .PHONY: all -all: command doc shell +all: base doc shell + +.PHONY: base +base: command # Build rules for the command. @@ -44,7 +47,7 @@ command: bin/slack bin/slack: src/slack.c mkdir -p bin - $(CC) -O3 -Wall -Wextra -pedantic $(CFLAGS) $(LDFLAGS) $(CPPFLAGS) -o $@ $< + $(CC) -O3 -Wall -Wextra -pedantic -o $@ $< $(CFLAGS) $(LDFLAGS) $(CPPFLAGS) # Build rules for documentation. @@ -52,30 +55,32 @@ bin/slack: src/slack.c doc: info pdf dvi ps .PHONY: info -info: slack.info -%.info: info/%.texinfo info/fdl.texinfo +info: bin/slack.info +bin/%.info: doc/info/%.texinfo doc/info/fdl.texinfo + @mkdir -p bin makeinfo $< + mv $*.info $@ .PHONY: pdf -pdf: slack.pdf -%.pdf: info/%.texinfo info/fdl.texinfo - @mkdir -p obj/pdf - cd obj/pdf ; yes X | texi2pdf ../../$< - mv obj/pdf/$@ $@ +pdf: bin/slack.pdf +bin/%.pdf: doc/info/%.texinfo doc/info/fdl.texinfo + @mkdir -p obj/pdf bin + cd obj/pdf && texi2pdf ../../$< < /dev/null + mv obj/pdf/$*.pdf $@ .PHONY: dvi -dvi: slack.dvi -%.dvi: info/%.texinfo info/fdl.texinfo - @mkdir -p obj/dvi - cd obj/dvi ; yes X | $(TEXI2DVI) ../../$< - mv obj/dvi/$@ $@ +dvi: bin/slack.dvi +bin/%.dvi: doc/info/%.texinfo doc/info/fdl.texinfo + @mkdir -p obj/dvi bin + cd obj/dvi && $(TEXI2DVI) ../../$< < /dev/null + mv obj/dvi/$*.dvi $@ .PHONY: ps -ps: slack.ps -%.ps: info/%.texinfo info/fdl.texinfo - @mkdir -p obj/ps - cd obj/ps ; yes X | texi2pdf --ps ../../$< - mv obj/ps/$@ $@ +ps: bin/slack.ps +bin/%.ps: doc/info/%.texinfo doc/info/fdl.texinfo + @mkdir -p obj/ps bin + cd obj/ps && texi2pdf --ps ../../$< < /dev/null + mv obj/ps/$*.ps $@ # Build rules for shell auto-completion. @@ -138,22 +143,22 @@ install-license: install-doc: install-info install-pdf install-ps install-dvi .PHONY: install-info -install-info: slack.info +install-info: bin/slack.info install -dm755 -- "$(DESTDIR)$(INFODIR)" install -m644 $< -- "$(DESTDIR)$(INFODIR)/$(PKGNAME).info" .PHONY: install-pdf -install-pdf: slack.pdf +install-pdf: bin/slack.pdf install -dm755 -- "$(DESTDIR)$(DOCDIR)" install -m644 $< -- "$(DESTDIR)$(DOCDIR)/$(PKGNAME).pdf" .PHONY: install-ps -install-ps: slack.ps +install-ps: bin/slack.ps install -dm755 -- "$(DESTDIR)$(DOCDIR)" install -m644 $< -- "$(DESTDIR)$(DOCDIR)/$(PKGNAME).ps" .PHONY: install-dvi -install-dvi: slack.dvi +install-dvi: bin/slack.dvi install -dm755 -- "$(DESTDIR)$(DOCDIR)" install -m644 $< -- "$(DESTDIR)$(DOCDIR)/$(PKGNAME).dvi" @@ -205,5 +210,5 @@ uninstall: .PHONY: clean clean: - -rm -rf obj bin slack.info slack.pdf slack.ps slack.dvi + -rm -r obj bin diff --git a/README b/README index 0977e0b..c95ef55 100644 --- a/README +++ b/README @@ -1,5 +1,49 @@ -Get the current timer slack value or spawn -a new process with a new timer slack value. +NAME + slack - Control your timer slack -Note: real-time threads do not slack around. +SYNOPSIS + slack (get | GET) + slack ((reset | INTERVAL) [--fatal] [--] COMMAND...) + +DESCRIPTION + Get the current timer slack value or spawn a new process + with a new timer slack value. + + If the verb get or GET is used, the current timer slack + value and exit. If get is used, the program shall use + as high prefix as possible. If GET is used the value + shall be printed in nanoseconds but not unit shall be + printed. + + If the verb reset is used, the process shall set the + timer slack value for the process to the default timer + slack value, and exec(3) to COMMAND. + + If an INTERVAL is given, the process shall set the + timer slack value for the process to INTERVAL, and + exec(3) to COMMAND. + + INTERVAL must be a positive number, optioanlly with + a prefix. Recognised prefixes (and units) are: + + ns, n nanoseconds (default) + µs, µ, us, u microseconds + ms, m milliseconds + s seconds + + The default timer slack value is the timer slack value + on PID 1. + +OPTIONS + --fatal + Fail if the timer slack value cannot be set. + +RATIONALE + Could be useful increase the performance of your computer. + +NOTES: + Real-time threads do not slack around. + +SEE ALSO + nice(1) ionice(1), prctl(2) diff --git a/doc/info/fdl.texinfo b/doc/info/fdl.texinfo new file mode 100644 index 0000000..cb71f05 --- /dev/null +++ b/doc/info/fdl.texinfo @@ -0,0 +1,505 @@ +@c The GNU Free Documentation License. +@center Version 1.3, 3 November 2008 + +@c This file is intended to be included within another document, +@c hence no sectioning command or @node. + +@display +Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. +@uref{http://fsf.org/} + +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. +@end display + +@enumerate 0 +@item +PREAMBLE + +The purpose of this License is to make a manual, textbook, or other +functional and useful document @dfn{free} in the sense of freedom: to +assure everyone the effective freedom to copy and redistribute it, +with or without modifying it, either commercially or noncommercially. +Secondarily, this License preserves for the author and publisher a way +to get credit for their work, while not being considered responsible +for modifications made by others. + +This License is a kind of ``copyleft'', which means that derivative +works of the document must themselves be free in the same sense. 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A copy of the license is included in the section entitled ``GNU + Free Documentation License''. +@end group +@end smallexample + +If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, +replace the ``with@dots{}Texts.''@: line with this: + +@smallexample +@group + with the Invariant Sections being @var{list their titles}, with + the Front-Cover Texts being @var{list}, and with the Back-Cover Texts + being @var{list}. +@end group +@end smallexample + +If you have Invariant Sections without Cover Texts, or some other +combination of the three, merge those two alternatives to suit the +situation. + +If your document contains nontrivial examples of program code, we +recommend releasing these examples in parallel under your choice of +free software license, such as the GNU General Public License, +to permit their use in free software. + +@c Local Variables: +@c ispell-local-pdict: "ispell-dict" +@c End: diff --git a/doc/info/slack.texinfo b/doc/info/slack.texinfo new file mode 100644 index 0000000..692b7c9 --- /dev/null +++ b/doc/info/slack.texinfo @@ -0,0 +1,143 @@ +1;2802;0c\input texinfo @c -*-texinfo-*- + +@c %**start of header +@setfilename slack.info +@settitle slack +@afourpaper +@documentencoding UTF-8 +@documentlanguage en +@finalout +@c %**end of header + + +@dircategory Miscellaneous +@direntry +* slack: (slack). Control your timer slack +@end direntry + + +@copying +Copyright @copyright{} 2014 Mattias Andrée + +@quotation +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with no +Invariant Sections, with no Front-Cover Texts, and with no Back-Cover +Texts. A copy of the license is included in the section entitled +``GNU Free Documentation License''. +@end quotation +@end copying + +@ifnottex +@node Top +@top slack -- Control your timer slack +@insertcopying +@end ifnottex + +@titlepage +@title slack +@subtitle Control your timer slack +@author by Mattias Andrée (maandree) + +@page +@c @center `' +@vskip 0pt plus 1filll +@insertcopying +@end titlepage + +@contents + + + +@menu +* Overview:: Brief overview of @command{slack}. +* Invoking:: Invocation of @command{slack}. +* GNU Free Documentation License:: Copying and sharing this manual. +@end menu + + + +@node Overview +@chapter Overview + +Get the current timer slack value or spawn a new +process with a new timer slack value. Timer slack +is inherited to child processes. + +Timer slack allows the kernel to coalesce events so +that the kernel does not need to which context as +often. For example, if you have a lot timers +@footnote{Timer slack affects more than timers.} +but you only want 100 milliseconds accuracy (instead +of 50 microsoconds accuracy which is the default) on +your timers you can set your tiemr slack to 100 +milliseconds. If this is done the kernel can let a +timer expire up to 100 milliseconds lot so it can +expire at the same time as other timers that expire +in the near future, this way the kernel will only +have to which between kernel mode and user mode +once. This can also have nice effects in user mode, +if you have an @code{epoll} with @code{timerfd}:s, +the epoll can return once and list multiple timers +than expire within 100 milliseconds of each other. + +Note: real-time threads do not slack off. + + + +@node Invoking +@chapter Invoking + +There are four ways to run @command{slack}: + +@table @command +@item slack get +Print the current process's timer slack in +human-readable format. + +@item slack GET +Print the current process's timer slack in +machine-readable format, namely the timer +slack in nanoseconds with digits only. + +@item slack reset [--fatal] [--] +Start the specified command with default +timer slack, which is determined by the +timer slack of the proceess with PID 1. +By default this is 50 microseconds. + +If @option{--fatal} is used, the specified +command will not be executed if its timer +slack cannot be set. If @option{--fatal} +is not used, the specified command will be +executed even if its timer slack cannot be +set. + +@item slack [--fatal] [--] +Start the specified command with a selected +timer slack. The timer slack must be expressed +as a integer optionally suffixed (without +any blank space) by `n', `u' (or the micro +character), `m', optionally in turn suffixed +by `s', for nanoseconds, microseconds and +milliseconds, respectively, `s' can be used +for whole seconds. If no suffix is used, +nanoseconds are assumed. + +If @option{--fatal} is used, the specified +command will not be executed if its timer +slack cannot be set. If @option{--fatal} +is not used, the specified command will be +executed even if its timer slack cannot be +set. +@end table + + + +@node GNU Free Documentation License +@appendix GNU Free Documentation License +@include fdl.texinfo + +@bye + diff --git a/info/fdl.texinfo b/info/fdl.texinfo deleted file mode 100644 index cb71f05..0000000 --- a/info/fdl.texinfo +++ /dev/null @@ -1,505 +0,0 @@ -@c The GNU Free Documentation License. -@center Version 1.3, 3 November 2008 - -@c This file is intended to be included within another document, -@c hence no sectioning command or @node. - -@display -Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. -@uref{http://fsf.org/} - -Everyone is permitted to copy and distribute verbatim copies -of this license document, but changing it is not allowed. -@end display - -@enumerate 0 -@item -PREAMBLE - -The purpose of this License is to make a manual, textbook, or other -functional and useful document @dfn{free} in the sense of freedom: to -assure everyone the effective freedom to copy and redistribute it, -with or without modifying it, either commercially or noncommercially. -Secondarily, this License preserves for the author and publisher a way -to get credit for their work, while not being considered responsible -for modifications made by others. - -This License is a kind of ``copyleft'', which means that derivative -works of the document must themselves be free in the same sense. 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Control your timer slack -@end direntry - - -@copying -Copyright @copyright{} 2014 Mattias Andrée - -@quotation -Permission is granted to copy, distribute and/or modify this document -under the terms of the GNU Free Documentation License, Version 1.3 or -any later version published by the Free Software Foundation; with no -Invariant Sections, with no Front-Cover Texts, and with no Back-Cover -Texts. A copy of the license is included in the section entitled -``GNU Free Documentation License''. -@end quotation -@end copying - -@ifnottex -@node Top -@top slack -- Control your timer slack -@insertcopying -@end ifnottex - -@titlepage -@title slack -@subtitle Control your timer slack -@author by Mattias Andrée (maandree) - -@page -@c @center `' -@vskip 0pt plus 1filll -@insertcopying -@end titlepage - -@contents - - - -@menu -* Overview:: Brief overview of @command{slack}. -* Invoking:: Invocation of @command{slack}. -* GNU Free Documentation License:: Copying and sharing this manual. -@end menu - - - -@node Overview -@chapter Overview - -Get the current timer slack value or spawn a new -process with a new timer slack value. Timer slack -is inherited to child processes. - -Timer slack allows the kernel to coalesce events so -that the kernel does not need to which context as -often. For example, if you have a lot timers -@footnote{Timer slack affects more than timers.} -but you only want 100 milliseconds accuracy (instead -of 50 microsoconds accuracy which is the default) on -your timers you can set your tiemr slack to 100 -milliseconds. If this is done the kernel can let a -timer expire up to 100 milliseconds lot so it can -expire at the same time as other timers that expire -in the near future, this way the kernel will only -have to which between kernel mode and user mode -once. This can also have nice effects in user mode, -if you have an @code{epoll} with @code{timerfd}:s, -the epoll can return once and list multiple timers -than expire within 100 milliseconds of each other. - -Note: real-time threads do not slack off. - - - -@node Invoking -@chapter Invoking - -There are four ways to run @command{slack}: - -@table @command -@item slack get -Print the current process's timer slack in -human-readable format. - -@item slack GET -Print the current process's timer slack in -machine-readable format, namely the timer -slack in nanoseconds with digits only. - -@item slack reset [--fatal] [--] -Start the specified command with default -timer slack, which is determined by the -timer slack of the proceess with PID 1. -By default this is 50 microseconds. - -If @option{--fatal} is used, the specified -command will not be executed if its timer -slack cannot be set. If @option{--fatal} -is not used, the specified command will be -executed even if its timer slack cannot be -set. - -@item slack [--fatal] [--] -Start the specified command with a selected -timer slack. The timer slack must be expressed -as a integer optionally suffixed (without -any blank space) by `n', `u' (or the micro -character), `m', optionally in turn suffixed -by `s', for nanoseconds, microseconds and -milliseconds, respectively, `s' can be used -for whole seconds. If no suffix is used, -nanoseconds are assumed. - -If @option{--fatal} is used, the specified -command will not be executed if its timer -slack cannot be set. If @option{--fatal} -is not used, the specified command will be -executed even if its timer slack cannot be -set. -@end table - - - -@node GNU Free Documentation License -@appendix GNU Free Documentation License -@include fdl.texinfo - -@bye - -- cgit v1.2.3-70-g09d2