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To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
cc: linux-kernel@vger.kernel.org, andrea@suse.de, dhowells@redhat.com
Subject: Re: rwsem-rw bench 
In-Reply-To: <51568623CC066847A1DC7EB0D95B587AF82D72@fmsmsx405.fm.intel.com> 
User-Agent: EMH/1.14.1 SEMI/1.14.4 (Hosorogi) FLIM/1.14.4
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Date: Tue, 11 Feb 2003 18:59:44 +0000
Message-ID: <512.1044989984@warthog.cambridge.redhat.com>
From: David Howells <dhowells@warthog.cambridge.redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 35683
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Here you go... SHAR format though. Have fun.

David

#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.2.1).
# To extract the files from this archive, save it to some FILE, remove
# everything before the `!/bin/sh' line above, then type `sh FILE'.
#
# Made on 2003-02-11 18:58 GMT by <dhowells@warthog.cambridge.redhat.com>.
# Source directory was `/dhowells/rwsem-tests'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode       name
# ------ ---------- ------------------------------------------
#    722 -rw-r--r-- driver.c
#    568 -rw-r--r-- Makefile
#   2745 -rw-r--r-- rwsem.c
#   2391 -rw-r--r-- rwsem-r1.c
#   2427 -rw-r--r-- rwsem-r2.c
#   2499 -rw-r--r-- rwsem-ro.c
#   3179 -rw-r--r-- rwsem-rw.c
#   2619 -rw-r--r-- rwsem-stat.txt
#   2467 -rw-r--r-- rwsem-w1.c
#   2578 -rw-r--r-- rwsem-wo.c
#    345 -rw-r--r-- wibble.c
#
save_IFS="${IFS}"
IFS="${IFS}:"
gettext_dir=FAILED
locale_dir=FAILED
first_param="$1"
for dir in $PATH
do
  if test "$gettext_dir" = FAILED && test -f $dir/gettext \
     && ($dir/gettext --version >/dev/null 2>&1)
  then
    set `$dir/gettext --version 2>&1`
    if test "$3" = GNU
    then
      gettext_dir=$dir
    fi
  fi
  if test "$locale_dir" = FAILED && test -f $dir/shar \
     && ($dir/shar --print-text-domain-dir >/dev/null 2>&1)
  then
    locale_dir=`$dir/shar --print-text-domain-dir`
  fi
done
IFS="$save_IFS"
if test "$locale_dir" = FAILED || test "$gettext_dir" = FAILED
then
  echo=echo
else
  TEXTDOMAINDIR=$locale_dir
  export TEXTDOMAINDIR
  TEXTDOMAIN=sharutils
  export TEXTDOMAIN
  echo="$gettext_dir/gettext -s"
fi
if touch -am -t 200112312359.59 $$.touch >/dev/null 2>&1 && test ! -f 200112312359.59 -a -f $$.touch; then
  shar_touch='touch -am -t $1$2$3$4$5$6.$7 "$8"'
elif touch -am 123123592001.59 $$.touch >/dev/null 2>&1 && test ! -f 123123592001.59 -a ! -f 123123592001.5 -a -f $$.touch; then
  shar_touch='touch -am $3$4$5$6$1$2.$7 "$8"'
elif touch -am 1231235901 $$.touch >/dev/null 2>&1 && test ! -f 1231235901 -a -f $$.touch; then
  shar_touch='touch -am $3$4$5$6$2 "$8"'
else
  shar_touch=:
  echo
  $echo 'WARNING: not restoring timestamps.  Consider getting and'
  $echo "installing GNU \`touch', distributed in GNU File Utilities..."
  echo
fi
rm -f 200112312359.59 123123592001.59 123123592001.5 1231235901 $$.touch
#
if mkdir _sh00477; then
  $echo 'x -' 'creating lock directory'
else
  $echo 'failed to create lock directory'
  exit 1
fi
# ============= driver.c ==============
if test -f 'driver.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'driver.c' '(file already exists)'
else
  $echo 'x -' extracting 'driver.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'driver.c' &&
/* run.c: run rwsem test
X *
X * Copyright (c) 2001   David Howells (dhowells@redhat.com).
X */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <fcntl.h>
X
int main(int argc, char *argv[])
{
X	char buf[1];
X	int max, loop, fd, tmp, rw;
X
X	fd = open("/proc/rwsem",O_RDWR);
X	if (fd<0) {
X		perror("open");
X		return 1;
X	}
X
X	max = (argc>1) ? atoi(argv[1]) : 50;
X	rw = max<0;
X	max = abs(max);
X
X	for (loop=max; loop>0; loop--) {
X		switch (fork()) {
X		case -1:
X			perror("fork");
X			return 1;
X		case 0:
X			rw ? write(fd," ",1) : read(fd,buf,1);
X			exit(1);
X		default:
X			break;
X		}
X	}
X
X	for (loop=max; loop>0; loop--) {
X		if (wait(&tmp)<0) {
X			perror("wait");
X			return 1;
X		}
X	}
X
X	return 0;
}
SHAR_EOF
  (set 20 01 04 10 18 17 09 'driver.c'; eval "$shar_touch") &&
  chmod 0644 'driver.c' ||
  $echo 'restore of' 'driver.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'driver.c:' 'MD5 check failed'
d1fa721cb13209319829801d8e5f9947  driver.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'driver.c'`"
    test 722 -eq "$shar_count" ||
    $echo 'driver.c:' 'original size' '722,' 'current size' "$shar_count!"
  fi
fi
# ============= Makefile ==============
if test -f 'Makefile' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'Makefile' '(file already exists)'
else
  $echo 'x -' extracting 'Makefile' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'Makefile' &&
############################################################
#
#
#
############################################################
X
CFLAGS	:= -Wall -Wstrict-prototypes -D__KERNEL__ -DMODULE
CFLAGS	+= -pipe -O2 -fomit-frame-pointer -fno-strict-aliasing
CFLAGS	+= -march=i686 -mpreferred-stack-boundary=2
CFLAGS	+= -I /dhowells/linux-rwsem/include
X
ifdef SCHED
CFLAGS	+= -DSCHED
endif
X
all: driver \
X	rwsem.o \
X	rwsem-rw.o \
X	rwsem-ro.o \
X	rwsem-wo.o \
X	rwsem-r1.o \
X	rwsem-w1.o \
X	rwsem-r2.o \
X	wibble.o
X
clean:
X	rm -f *.o *~ driver
X
%.s: %.c
X	$(CC) $(CFLAGS) -S -o $@ $<
SHAR_EOF
  (set 20 01 04 20 13 02 27 'Makefile'; eval "$shar_touch") &&
  chmod 0644 'Makefile' ||
  $echo 'restore of' 'Makefile' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'Makefile:' 'MD5 check failed'
30fcf0375e03f36310239d6b38123c91  Makefile
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'Makefile'`"
    test 568 -eq "$shar_count" ||
    $echo 'Makefile:' 'original size' '568,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem.c ==============
if test -f 'rwsem.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem.c' &&
/* rwsem.c: bad R/W semaphore support
X *
X * Copyright (c) 2001   David Howells (dhowells@redhat.com).
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
X
#define kdebug(FMT,...)
//#define kdebug printk
X
MODULE_AUTHOR("David Howells");
MODULE_DESCRIPTION("R/W semaphore test demo");
X
X
struct proc_dir_entry *rwsem_proc;
X
struct rw_semaphore rwsem_sem;
X
#define SLEEP(sec) { \
int slsec = sec; \
X  while (slsec) { \
X    current->state = TASK_INTERRUPTIBLE; \
X    schedule_timeout(HZ); \
X    slsec--; \
X    current->state = TASK_RUNNING; \
X  } \
}
X
/*****************************************************************************/
/*
X * 
X */
static int rwsem_read_proc(char *page, char **start, off_t off,
X			   int count, int *eof, void *data)
{
X	kdebug("[%d] r-downing: %08x\n",current->pid,rwsem_sem.count.counter);
X	down_read(&rwsem_sem);
X	kdebug("[%d] r-downed: %08x\n",current->pid,rwsem_sem.count.counter);
X	SLEEP(1);
X	kdebug("[%d] r-upping: %08x\n",current->pid,rwsem_sem.count.counter);
X	up_read(&rwsem_sem);
X	kdebug("[%d] r-upped: %08x\n",current->pid,rwsem_sem.count.counter);
X
X	return -ENOENT;
} /* end rwsem_read_proc() */
X
/*****************************************************************************/
/*
X * 
X */
static int rwsem_write_proc(struct file *file, const char *buffer, unsigned long count, void *data)
{
X	kdebug("[%d] w-downing: %08x\n",current->pid,rwsem_sem.count.counter);
X	down_write(&rwsem_sem);
X	kdebug("[%d] w-downed: %08x\n",current->pid,rwsem_sem.count.counter);
X	SLEEP(1);
X	kdebug("[%d] w-upping: %08x\n",current->pid,rwsem_sem.count.counter);
X	up_write(&rwsem_sem);
X	kdebug("[%d] w-upped: %08x\n",current->pid,rwsem_sem.count.counter);
X
X	return -ENOENT;
} /* end rwsem_write_proc() */
X
/*****************************************************************************/
/*
X *
X */
static int __init rwsem_init_module(void)
{
X	kdebug(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X
X	//rwsem_sem.debug = 1;
X
X	/* try and create the access point */
X	rwsem_proc = create_proc_entry("rwsem",S_IRUGO|S_IWUGO,NULL);
X	if (!rwsem_proc)
X		return -EEXIST;
X
X	rwsem_proc->read_proc = &rwsem_read_proc;
X	rwsem_proc->write_proc = &rwsem_write_proc;
X	return 0;
} /* end rwsem_init_module() */
X
/*****************************************************************************/
/*
X *
X */
static void __exit rwsem_cleanup_module(void)
{
X	kdebug(KERN_INFO "rwsem unloading\n");
X
X	remove_proc_entry("rwsem",NULL);
X
} /* end rwsem_cleanup_module() */
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 12 15 11 27 'rwsem.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem.c' ||
  $echo 'restore of' 'rwsem.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem.c:' 'MD5 check failed'
b54bbebf12f0319ef756d47d3ad6f817  rwsem.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem.c'`"
    test 2745 -eq "$shar_count" ||
    $echo 'rwsem.c:' 'original size' '2745,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-r1.c ==============
if test -f 'rwsem-r1.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-r1.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-r1.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-r1.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dr(void)
{
X	down_read(&rwsem_sem);
X	atomic_inc(&readers);
X	atomic_inc(&reads_taken);
X	CHECK(atomic_read(&writers) == 0);
}
X
static inline void ur(void)
{
X	CHECK(atomic_read(&writers) == 0);
X	atomic_dec(&readers);
X	up_read(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int reader(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dr();
X		ur();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(reader, "ReadA", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 21 37 06 'rwsem-r1.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-r1.c' ||
  $echo 'restore of' 'rwsem-r1.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-r1.c:' 'MD5 check failed'
7316246a6b3e829c4ccb45a957161036  rwsem-r1.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-r1.c'`"
    test 2391 -eq "$shar_count" ||
    $echo 'rwsem-r1.c:' 'original size' '2391,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-r2.c ==============
if test -f 'rwsem-r2.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-r2.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-r2.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-r2.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dr(void)
{
X	down_read(&rwsem_sem);
X	atomic_inc(&readers);
X	atomic_inc(&reads_taken);
X	CHECK(atomic_read(&writers) == 0);
}
X
static inline void ur(void)
{
X	CHECK(atomic_read(&writers) == 0);
X	atomic_dec(&readers);
X	up_read(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int reader(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dr();
X		ur();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(reader, "ReadA", 0);
X	kernel_thread(reader, "ReadB", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 22 01 38 'rwsem-r2.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-r2.c' ||
  $echo 'restore of' 'rwsem-r2.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-r2.c:' 'MD5 check failed'
c22df6923bf7bb928fc163646ea3438a  rwsem-r2.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-r2.c'`"
    test 2427 -eq "$shar_count" ||
    $echo 'rwsem-r2.c:' 'original size' '2427,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-ro.c ==============
if test -f 'rwsem-ro.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-ro.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-ro.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-ro.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dr(void)
{
X	down_read(&rwsem_sem);
X	atomic_inc(&readers);
X	atomic_inc(&reads_taken);
X	CHECK(atomic_read(&writers) == 0);
}
X
static inline void ur(void)
{
X	CHECK(atomic_read(&writers) == 0);
X	atomic_dec(&readers);
X	up_read(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int reader(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dr();
X		ur();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(reader, "ReadA", 0);
X	kernel_thread(reader, "ReadB", 0);
X	kernel_thread(reader, "ReadC", 0);
X	kernel_thread(reader, "ReadD", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 21 37 17 'rwsem-ro.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-ro.c' ||
  $echo 'restore of' 'rwsem-ro.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-ro.c:' 'MD5 check failed'
ea56f13f27896585c247422a936d925b  rwsem-ro.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-ro.c'`"
    test 2499 -eq "$shar_count" ||
    $echo 'rwsem-ro.c:' 'original size' '2499,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-rw.c ==============
if test -f 'rwsem-rw.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-rw.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-rw.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-rw.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dr(void)
{
X	down_read(&rwsem_sem);
X	atomic_inc(&readers);
X	atomic_inc(&reads_taken);
X	CHECK(atomic_read(&writers) == 0);
}
X
static inline void ur(void)
{
X	CHECK(atomic_read(&writers) == 0);
X	atomic_dec(&readers);
X	up_read(&rwsem_sem);
}
X
static inline void dw(void)
{
X	down_write(&rwsem_sem);
X	atomic_inc(&writers);
X	atomic_inc(&writes_taken);
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
}
X
static inline void uw(void)
{
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
X	atomic_dec(&writers);
X	up_write(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int reader(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dr();
X		ur();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
int writer(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dw();
X		uw();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(writer, "WriteA", 0);
X	kernel_thread(writer, "WriteB", 0);
X
X	kernel_thread(reader, "ReadA", 0);
X	kernel_thread(reader, "ReadB", 0);
X	kernel_thread(reader, "ReadC", 0);
X	kernel_thread(reader, "ReadD", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 21 37 27 'rwsem-rw.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-rw.c' ||
  $echo 'restore of' 'rwsem-rw.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-rw.c:' 'MD5 check failed'
0e0352bfded0418a41c1f54f2c7136a8  rwsem-rw.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-rw.c'`"
    test 3179 -eq "$shar_count" ||
    $echo 'rwsem-rw.c:' 'original size' '3179,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-stat.txt ==============
if test -f 'rwsem-stat.txt' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-stat.txt' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-stat.txt' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-stat.txt' &&
TEST		NUM READERS	NUM WRITERS	CONTENTION
===============	===============	===============	==========
rwsem-rw	4		2		r-w & w-w
rwsem-ro	4		0		no
rwsem-wo	0		4		w-w only
rwsem-r1	1		0		no
rwsem-w1	0		1		no
rwsem-r2	2		0		no
X
X
ENVIRONMENT			TEST	SCHED	READERS		WRITERS
===============================	=======	=======	===============	=======
Linux-2.4.4-pre3 + AA-rwsem	rws-rw	no	 3330281	    1009
X						 3331972	     994
X					yes	 1767102	  607091
X						 1743420	  642095
X				rws-ro	no	 2534630	n/a
X						 3535202	n/a
X					yes	 2837218	n/a
X						 3164814	n/a
X				rws-wo	no	n/a		 2507449
X						n/a		 2399102
X					yes	n/a		 1568467
X						n/a		 1412262
X				rws-r1	no	 9232485	n/a
X						 9217585	n/a
X					yes	 5483757	n/a
X						 5487028	n/a
X				rws-w1	no	n/a		 9900333
X						n/a		 9918021
X					yes	n/a		 5745657
X						n/a		 5747063
X				rws-r2	no	 3499275	n/a
X						 3518590	n/a
X					yes	 3184431	n/a
X						 3180287	n/a
X
-------------------------------	-------	-------	---------------	-------
Linux-2.4.4-pre4 [XADD]		rws-rw	no	  563388	  283005
X						  558159	  280288
X					yes	  683670	  197017
X						  700714	  194316
X				rws-ro	no	 6316985	n/a
X						 6314241	n/a
X					yes	 4309406	n/a
X						 4575043	n/a
X				rws-wo	no	n/a		  765699
X						n/a		  763876
X					yes	n/a		  650512
X						n/a		  652287
X				rws-r1	no	15171532	n/a
X						15158899	n/a
X					yes	 7222310	n/a
X						 7229793	n/a
X				rws-w1	no	n/a		13942744
X						n/a		13991823
X					yes	n/a		 7362605
X						n/a		 7356127
X				rws-r2	no	 5517671	n/a
X						 5516168	n/a
X					yes	 3452796	n/a
X						 3331947	n/a
X
-------------------------------	-------	-------	---------------	-------
Linux-2.4.4-pre4 [XADD]		rws-rw	no	  531929	  267129
X + slightly-unfair-contention			  531093	  266822
X   tweak				yes	  839560	  185670
X						  903995	  183958
X				rws-ro	no	 6318293	n/a
X						 6320336	n/a
X					yes	 4257862	n/a
X						 4315243	n/a
X				rws-wo	no	n/a		  766427
X						n/a		  766471
X					yes	n/a		  644036
X						n/a		  642236
X
X
-------------------------------	-------	-------	---------------	-------
Linux-2.4.4-pre4 [GENERIC-SPIN]	rws-rw	no	  545138	  274002
X						  545378	  273785
X					yes	  755343	  187874
X						  745888	  185562
X				rws-ro	no	 4500398	n/a
X						 4506583	n/a
X					yes	 3137883	n/a
X						 3129119	n/a
X				rws-wo	no	n/a		  763599
X						n/a		  763059
X					yes	n/a		  641256
X						n/a		  647319
X				rws-r1	no	13110083	n/a
X						13115436	n/a
X					yes	 6950687	n/a
X						 6951901	n/a
X				rws-w1	no	n/a		13004627
X						n/a		13003754
X					yes	n/a		 6899764
X						n/a		 6898953
X				rws-r2	no	 4741615	n/a
X						 4746860	n/a
X					yes	 3340292	n/a
X						 2967268	n/a
SHAR_EOF
  (set 20 01 04 19 23 22 19 'rwsem-stat.txt'; eval "$shar_touch") &&
  chmod 0644 'rwsem-stat.txt' ||
  $echo 'restore of' 'rwsem-stat.txt' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-stat.txt:' 'MD5 check failed'
3cb1536ef80b52ce59ac03a320e4d4c1  rwsem-stat.txt
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-stat.txt'`"
    test 2619 -eq "$shar_count" ||
    $echo 'rwsem-stat.txt:' 'original size' '2619,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-w1.c ==============
if test -f 'rwsem-w1.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-w1.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-w1.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-w1.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dw(void)
{
X	down_write(&rwsem_sem);
X	atomic_inc(&writers);
X	atomic_inc(&writes_taken);
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
}
X
static inline void uw(void)
{
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
X	atomic_dec(&writers);
X	up_write(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int writer(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dw();
X		uw();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(writer, "WriteA", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 21 37 39 'rwsem-w1.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-w1.c' ||
  $echo 'restore of' 'rwsem-w1.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-w1.c:' 'MD5 check failed'
a3c20d6d0af402a7592b7645c3f666a4  rwsem-w1.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-w1.c'`"
    test 2467 -eq "$shar_count" ||
    $echo 'rwsem-w1.c:' 'original size' '2467,' 'current size' "$shar_count!"
  fi
fi
# ============= rwsem-wo.c ==============
if test -f 'rwsem-wo.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'rwsem-wo.c' '(file already exists)'
else
  $echo 'x -' extracting 'rwsem-wo.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'rwsem-wo.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/atomic.h>
#include <linux/personality.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/timer.h>
X
struct rw_semaphore rwsem_sem;
X
#ifdef DEBUG_RWSEM
extern struct rw_semaphore *rwsem_to_monitor;
#endif
X
static atomic_t readers = ATOMIC_INIT(0);
static atomic_t writers = ATOMIC_INIT(0);
static atomic_t do_stuff = ATOMIC_INIT(0);
static atomic_t runners = ATOMIC_INIT(0);
static atomic_t reads_taken = ATOMIC_INIT(0);
static atomic_t writes_taken = ATOMIC_INIT(0);
X
static struct timer_list timer;
X
#define CHECK(expr)								\
X	do {									\
X		if (!(expr)) {							\
X			printk("check " #expr " failed in " __FUNCTION__ "\n");\
X		}								\
X	} while (0)
X
static inline void dw(void)
{
X	down_write(&rwsem_sem);
X	atomic_inc(&writers);
X	atomic_inc(&writes_taken);
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
}
X
static inline void uw(void)
{
X	CHECK(atomic_read(&writers) == 1);
X	CHECK(atomic_read(&readers) == 0);
X	atomic_dec(&writers);
X	up_write(&rwsem_sem);
}
X
static inline void sched(void)
{
#ifdef SCHED
X	schedule();
#endif
}
X
int writer(void *arg)
{
X	strcpy(current->comm, arg);
X	current->mm->arg_start = 0;
X	current->mm->arg_end = 0;
X
X	atomic_inc(&runners);
X
X	while (atomic_read(&do_stuff)) {
X		dw();
X		uw();
X		sched();
X	}
X
X	atomic_dec(&runners);
X	printk("%s: done\n",current->comm);
X	return 0;
}
X
static void stop_test(unsigned long dummy)
{
X	atomic_set(&do_stuff, 0);
}
X
static int __init rwsem_init_module(void)
{
X	printk(KERN_INFO "rwsem loading...\n");
X
X	init_rwsem(&rwsem_sem);
X	atomic_set(&do_stuff, 1);
X
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = &rwsem_sem;
#endif
X	init_timer(&timer);
X	timer.function = stop_test;
X	timer.expires = jiffies + 5 * HZ;
X	add_timer(&timer);
X
X	kernel_thread(writer, "WriteA", 0);
X	kernel_thread(writer, "WriteB", 0);
X	kernel_thread(writer, "WriteC", 0);
X	kernel_thread(writer, "WriteD", 0);
X
X	return 0;
}
X
static void __exit rwsem_cleanup_module(void)
{
X	printk(KERN_INFO "rwsem unloading\n");
X
X	atomic_set(&do_stuff, 0);
X	del_timer(&timer);
X	while (atomic_read(&runners))
X		schedule();
X	printk("reads taken: %d\n", atomic_read(&reads_taken));
X	printk("writes taken: %d\n", atomic_read(&writes_taken));
#ifdef DEBUG_RWSEM
X	rwsem_to_monitor = 0;
#endif
X	remove_proc_entry("rwsem",NULL);
X
}
X
module_init(rwsem_init_module);
module_exit(rwsem_cleanup_module);
SHAR_EOF
  (set 20 01 04 19 21 37 44 'rwsem-wo.c'; eval "$shar_touch") &&
  chmod 0644 'rwsem-wo.c' ||
  $echo 'restore of' 'rwsem-wo.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'rwsem-wo.c:' 'MD5 check failed'
d2a6d6a11e9ed7dafcb6d593b5872705  rwsem-wo.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'rwsem-wo.c'`"
    test 2578 -eq "$shar_count" ||
    $echo 'rwsem-wo.c:' 'original size' '2578,' 'current size' "$shar_count!"
  fi
fi
# ============= wibble.c ==============
if test -f 'wibble.c' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'wibble.c' '(file already exists)'
else
  $echo 'x -' extracting 'wibble.c' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'wibble.c' &&
/*
X * This is for the new, simple rwsems
X */
X
#include <linux/config.h>
#include <linux/rwsem.h>
X
#if 0
void dr(struct rw_semaphore *sem)
{
X	down_read(sem);
}
#endif
X
void ur(struct rw_semaphore *sem)
{
X	up_read(sem);
}
X
#if 0
void dw(struct rw_semaphore *sem)
{
X	down_write(sem);
}
X
void uw(struct rw_semaphore *sem)
{
X	up_write(sem);
}
#endif
SHAR_EOF
  (set 20 01 04 20 13 03 44 'wibble.c'; eval "$shar_touch") &&
  chmod 0644 'wibble.c' ||
  $echo 'restore of' 'wibble.c' 'failed'
  if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
  && ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
    md5sum -c << SHAR_EOF >/dev/null 2>&1 \
    || $echo 'wibble.c:' 'MD5 check failed'
fb5d951f81e8e0aa90bbea320c410e02  wibble.c
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'wibble.c'`"
    test 345 -eq "$shar_count" ||
    $echo 'wibble.c:' 'original size' '345,' 'current size' "$shar_count!"
  fi
fi
rm -fr _sh00477
exit 0
-
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