diff options
| -rw-r--r-- | .gitignore | 17 | ||||
| -rw-r--r-- | LICENSE | 15 | ||||
| -rw-r--r-- | Makefile | 46 | ||||
| -rw-r--r-- | README | 41 | ||||
| -rw-r--r-- | TODO | 2 | ||||
| -rw-r--r-- | config.mk | 8 | ||||
| -rw-r--r-- | coredown.1 | 78 | ||||
| -rw-r--r-- | coreup.1 | 72 | ||||
| -rw-r--r-- | coreupdown.c | 77 |
9 files changed, 356 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..e9dfb32 --- /dev/null +++ b/.gitignore @@ -0,0 +1,17 @@ +*\#* +*~ +*.o +*.a +*.lo +*.su +*.so +*.so.* +*.dll +*.dylib +*.gch +*.gcov +*.gcno +*.gcda +/coreupdown +/coreup +/coredown @@ -0,0 +1,15 @@ +ISC License + +© 2024 Mattias Andrée <maandree@kth.se> + +Permission to use, copy, modify, and/or distribute this software for any +purpose with or without fee is hereby granted, provided that the above +copyright notice and this permission notice appear in all copies. + +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..f0d383d --- /dev/null +++ b/Makefile @@ -0,0 +1,46 @@ +.POSIX: + +CONFIGFILE = config.mk +include $(CONFIGFILE) + +OBJ =\ + coreupdown.o + +HDR = + +all: coreupdown +$(OBJ): $(HDR) + +.c.o: + $(CC) -c -o $@ $< $(CFLAGS) $(CPPFLAGS) + +coreupdown: $(OBJ) + $(CC) -o $@ $(OBJ) $(LDFLAGS) + +install: coreupdown + mkdir -p -- "$(DESTDIR)$(PREFIX)/bin" + mkdir -p -- "$(DESTDIR)$(MANPREFIX)/man1" + test -f "$(DESTDIR)$(PREFIX)/bin/coreup" || test ! -e "$(DESTDIR)$(PREFIX)/bin/coreup" + test -f "$(DESTDIR)$(PREFIX)/bin/coredown" || test ! -e "$(DESTDIR)$(PREFIX)/bin/coredown" + cp -- coreupdown "$(DESTDIR)$(PREFIX)/bin/coreup" + ln -sf coreup "$(DESTDIR)$(PREFIX)/bin/coredown" + cp -- coreup.1 coredown.1 "$(DESTDIR)$(MANPREFIX)/man1" + +postinstall: + chown '0:0' "$(DESTDIR)$(PREFIX)/bin/coreup" + chmod '4755' "$(DESTDIR)$(PREFIX)/bin/coreup" + +uninstall: + -rm -f -- "$(DESTDIR)$(PREFIX)/bin/coreup" + -rm -f -- "$(DESTDIR)$(PREFIX)/bin/coredown" + -rm -f -- "$(DESTDIR)$(MANPREFIX)/man1/coreup.1" + -rm -f -- "$(DESTDIR)$(MANPREFIX)/man1/coredown.1" + +clean: + -rm -f -- *.o *.a *.lo *.su *.so *.so.* *.gch *.gcov *.gcno *.gcda + -rm -f -- coreupdown + +.SUFFIXES: +.SUFFIXES: .o .c + +.PHONY: all install uninstall clean @@ -0,0 +1,41 @@ +MAME + coreup - Enable all CPU core + coredown - Disable all but one CPU core + +SYNPOSIS + coreup [count] + coredown [count] + +DESCRIPTION + The coreup utility enables all CPU cores on the machine. + + The coredown utility disables all CPU cores on the machine + expect the CPU 0. + + This is designed as a workaround for virtual machines that + have input performance issues (keyboard input lag and keys + getting stuck) when more than one CPU core is online. + +OPTIONS + No options are supported. + +OPERANDS + The following operand is supported: + + count + Enable the first count CPU cores and disable the rest. + +EXIT STATUS + If the coreup and coredown utility fails it will exit with one + of the following statuses: + + 0 Successful completion. + + 1 An error occurred. + +NOTES + The is no difference between the coreup(1) and coredown(1) + utilities when the count operand is specified. + +SEE ALSO + None. @@ -0,0 +1,2 @@ +Add coreupdownd to automatically run coreup and coredown when the +machine has high or low CPU usage diff --git a/config.mk b/config.mk new file mode 100644 index 0000000..f1d6591 --- /dev/null +++ b/config.mk @@ -0,0 +1,8 @@ +PREFIX = /usr +MANPREFIX = $(PREFIX)/share/man + +CC = c99 + +CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE +CFLAGS = +LDFLAGS = diff --git a/coredown.1 b/coredown.1 new file mode 100644 index 0000000..666ea46 --- /dev/null +++ b/coredown.1 @@ -0,0 +1,78 @@ +.TH COREDOWN 1 COREDOWNDOWN +.SH NAME +coredown - Disable all but one CPU core +.SH SYNPOSIS +coredown +.RI [ count ] +.SH DESCRIPTION +The +.B coredown +utility disables all CPU cores on the machine +expect the CPU 0. +.PP +This is designed as a workaround for virtual machines +that have input performance issues (keyboard input lag +and keys getting stuck) when more than one CPU core is +online. +.SH OPTIONS +No options are supported. +.SH OPERANDS +The following operand is supported: +.TP +.I count +Enable the first +.I count +CPU cores and disable the rest. +.SH STDIN +The +.B coredown +utility does not use the standard input. +.SH INPUT FILES +None. +.SH ENVIRONMENT VARIABLES +No environment variables affects the execution of +.B coredown +.SH ASYNCHRONOUS EVENTS +Default. +.SH STDOUT +The +.B coredown +utility does not use the standard output. +.SH STDERR +The standard error is used for diagnostic messages. +.SH OUTPUT FILES +None. +.SH EXTENDED DESCRIPTION +None. +.SH EXIT STATUS +If the +.B coredown +utility fails it will exit with one of the following statuses: +.TP +0 +Successful completion. +.TP +1 +An error occurred. +.SH CONSEQUENCES OF ERRORS +Default. +.SH APPLICATION USAGE +None. +.SH EXAMPLES +None. +.SH RATIONALE +None. +.SH NOTES +The is no difference between the +.BR coreup (1) +and +.BR coredown (1) +utilities when the +.I count +operand is specified. +.SH BUGS +None. +.SH FUTURE DIRECTIONS +None. +.SH SEE ALSO +.BR coreup (1) diff --git a/coreup.1 b/coreup.1 new file mode 100644 index 0000000..1dfe99f --- /dev/null +++ b/coreup.1 @@ -0,0 +1,72 @@ +.TH COREUP 1 COREUPDOWN +.SH MAME +coreup - Enable all CPU core +.SH SYNPOSIS +coreup +.RI [ count ] +.SH DESCRIPTION +The +.B coreup +utility enables all CPU cores on the machine. +.SH OPTIONS +No options are supported. +.SH OPERANDS +The following operand is supported: +.TP +.I count +Enable the first +.I count +CPU cores and disable the rest. +.SH STDIN +The +.B coreup +utility does not use the standard input. +.SH INPUT FILES +None. +.SH ENVIRONMENT VARIABLES +No environment variables affects the execution of +.B coreup +.SH ASYNCHRONOUS EVENTS +Default. +.SH STDOUT +The +.B coreup +utility does not use the standard output. +.SH STDERR +The standard error is used for diagnostic messages. +.SH OUTPUT FILES +None. +.SH EXTENDED DESCRIPTION +None. +.SH EXIT STATUS +If the +.B coreup +utility fails it will exit with one of the following statuses: +.TP +0 +Successful completion. +.TP +1 +An error occurred. +.SH CONSEQUENCES OF ERRORS +Default. +.SH APPLICATION USAGE +None. +.SH EXAMPLES +None. +.SH RATIONALE +None. +.SH NOTES +The is no difference between the +.BR coreup (1) +and +.BR coredown (1) +utilities when the +.I count +operand is specified. +.SH BUGS +None. +.SH FUTURE DIRECTIONS +None. +.SH SEE ALSO +.BR coredown (1) diff --git a/coreupdown.c b/coreupdown.c new file mode 100644 index 0000000..1de5007 --- /dev/null +++ b/coreupdown.c @@ -0,0 +1,77 @@ +/* See LICENSE file for copyright and license details. */ +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +int +main(int argc, char *argv[]) +{ + unsigned long i, count; + const char *command, *argv0; + char path[sizeof("/sys/devices/system/cpu/cpu/online") + 3 * sizeof(i)]; + int fd, ret = 0; + + if (argc == 0) { + wrong_command: + fprintf(stderr, "usage: coreup [count]\nusage: coredown [count]\n"); + return 1; + } + + argv0 = *argv++; + argc--; + command = strrchr(argv0, '/'); + command = command ? &command[1] : argv0; + + if (!strcmp(command, "coreup")) + count = ULONG_MAX; + else if (!strcmp(command, "coredown")) + count = 1; + else + goto wrong_command; + + if (argc && !strcmp(argv[0], "--")) { + argv++; + argc--; + } + + if (argc > 1) { + usage: + fprintf(stderr, "usage: %s [count]\n", argv0); + return 1; + } + + if (argc >= 1) { + char *end; + errno = 0; + if (!isdigit(**argv)) + goto usage; + count = strtoul(*argv, &end, 10); + if (!count || errno || *end) + goto usage; + argv++; + argc--; + } + + for (i = 1; i; i++) { + sprintf(path, "/sys/devices/system/cpu/cpu%zu/online", i); + fd = open(path, O_WRONLY); + if (fd < 0) { + if (errno == ENOENT) + break; + fprintf(stderr, "%s: open %s O_WRONLY\n", argv0, path); + return 1; + } + if (write(fd, i < count ? "1\n" : "0\n", 2) < 0) { + fprintf(stderr, "%s: write %s\n", argv0, path); + ret = 1; + } + close(fd); + } + + return ret; +} |