Pched checker

From NuclearCat's homepage

Contents 1 Patches 2 Timer checkers 2.1 network 2.2 thread

[edit] Patches

Patch for 2.6.22 / 2.6.23

Signed-off-by: Patrick McHardy <kaber@trash.net>

---
commit a3885788169f2f70634f8142344e5131ccf32595
tree 62bcf28c9706547228521dc4402ebea273326331
parent 0e52ab8ceb41df2104279938484267ab474286d1
author Patrick McHardy <kaber@trash.net> Wed, 10 Oct 2007 16:29:14 +0200
committer Patrick McHardy <kaber@trash.net> Wed, 10 Oct 2007 16:29:14 +0200

 net/sched/sch_api.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index dee0d5f..8f1bcf6 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1225,10 +1225,13 @@ EXPORT_SYMBOL(tcf_destroy_chain);
 #ifdef CONFIG_PROC_FS
 static int psched_show(struct seq_file *seq, void *v)
 {
+	struct timespec ts;
+
+	hrtimer_get_res(CLOCK_MONOTONIC, &ts);
 	seq_printf(seq, "%08x %08x %08x %08x\n",
 		   (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1),
 		   1000000,
-		   (u32)NSEC_PER_SEC/(u32)ktime_to_ns(KTIME_MONOTONIC_RES));
+		   (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
 
 	return 0;
 }

[edit] Timer checkers

[edit] network

Program is trivial
http://www.nuclearcat.com/soft/iproute2_res.c
compiled binary http://www.nuclearcat.com/soft/iproute2_res (glibc-2.6)

[edit] thread

/* Timer checker 
/ (c) Christoph Lameter <clameter NOSPAM sgi.com>
/
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <asm/unistd.h>
#include <pthread.h>

#define clock_getres(x,y) syscall(__NR_clock_getres, x,y)
#define clock_gettime(x,y) syscall(__NR_clock_gettime, x, y)
#define clock_settime(x,y) syscall(__NR_clock_settime, x, y)

void pr(int clock,const char *n)
{
	struct timespec tv = {1,2};
	struct timespec res = {3,4};
	int rc;


	rc=clock_getres(clock,&res);
	if (rc) {
		printf("getres return code on %s=%d errno=%d\n",n,rc,errno);
	}
	rc=clock_gettime(clock,&tv);
	if (rc) {
		printf("gettime return code on %s=%d errno=%d\n",n,rc, errno);
	}
	else
	printf("%25s=% 11d.%09d resolution=% 2d.%09d\n",n,tv.tv_sec,tv.tv_nsec,res.tv_sec,res.tv_nsec);
}

int y;

void kx(long long x) {
	y=x;
};

struct timespec zero;

pthread_t thread[10];

struct tinfo {
	int i;
	struct timespec ttime,ptime;
} tinf[10];

void *thread_function(void *x) {
	struct tinfo *t=x;
	int i;

	for(i=1;i< t->i;i++) kx(1000000000000LL/i);
	clock_gettime(CLOCK_THREAD_CPUTIME_ID,&t->ttime);
	clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&t->ptime);
}

int main(char argc, char *argv[])
{
	struct timespec tv;
	int i;

	/* Waste some time */
	printf("Single Thread Testing\n");

	for(i=1;i<10000000;i++) kx(1000000000000LL/i);
	pr(CLOCK_THREAD_CPUTIME_ID,"CLOCK_THREAD_CPUTIME_ID");
	pr(CLOCK_PROCESS_CPUTIME_ID,"CLOCK_PROCESS_CPUTIME_ID");
	/* Waste some more time in threads */
	printf("Multi Thread Testing\nStarting Thread:");
	clock_settime(CLOCK_PROCESS_CPUTIME_ID,&zero);
	for(i=0;i<10;i++) {
		tinf[i].i=i*1000000;
		if (pthread_create(&thread[i], NULL, thread_function, tinf+i))
			perror("thread");
		else
			printf(" %d",i);
	}
	printf("\n Joining Thread:");
	for(i=0;i<10;i++) if (pthread_join( thread[i], NULL)) perror("join"); else printf(" %d",i);
	printf("\n");
	for(i=0;i<10;i++) {
		printf("%d Cycles=%7d Thread=% 3d.%09dns Process=% 3d.%09dns\n",i,tinf[i].i,tinf[i].ttime.tv_sec,tinf[i].ttime.tv_nsec,tinf[i].ptime.tv_sec,tinf[i].ptime.tv_nsec);
	}
	gettimeofday((struct timeval *)&tv);
	tv.tv_nsec = tv.tv_nsec*1000;
	printf("\nClock status at the end of the timer tests:\n");
	printf("          Gettimeofday() =% 11d.%09d\n",tv.tv_sec,tv.tv_nsec);
	pr(CLOCK_REALTIME,"CLOCK_REALTIME");
	pr(CLOCK_MONOTONIC,"CLOCK_MONOTONIC");
	pr(CLOCK_PROCESS_CPUTIME_ID,"CLOCK_PROCESS_CPUTIME_ID");
	pr(CLOCK_THREAD_CPUTIME_ID,"CLOCK_THREAD_CPUTIME_ID");
	pr(10,"CLOCK_SGI_CYCLE");
	pr(-1,"PROCESS clock of 1 (init)");
	pr(-1 - 4*1024*1024,"THREAD clock of 1 (init)");
	printf("\n");
}

Timewarp from Ingo Molnar http://lwn.net/Articles/209168/