Date: Fri, 02 Sep 2005 14:01:04 -0400 From: Ben Thomas <bthomas@virtualiron.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/85658: [patch] add DDB command, show runq, to sched_ule.c Message-ID: <43189360.6010304@virtualiron.com> Resent-Message-ID: <200509021810.j82IACwt059891@freefall.freebsd.org>
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>Number: 85658
>Category: kern
>Synopsis: [patch] add DDB command, show runq, to sched_ule.c
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Fri Sep 02 18:10:12 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Ben Thomas
>Release: FreeBSD 5.4-RELEASE i386
>Organization:
Virtual Iron Software
>Environment:
System: FreeBSD bthomas4.katana-technology.com 5.4-RELEASE FreeBSD 5.4-RELEASE #10: Sun Aug 28 13:48:00 EDT 2005 ben@bthomas4.katana-technology.com:/usr/obj/usr/home/ben/BSD/RELENG_5_4_0_RELEASE/src/sys/BEN i386
>Description:
I've found a need to look at the run queues for debugging purposes. After
a while, you get tired of running through data structures, and want something
a little simpler. This patch adds a "show runq" DDB command that dumps the
current run queues. Note that this is for sched_ule.c, which is all we run.
I assume that with a little work, it would apply to sched_4bsd.
This patch is against the 5_4_0_RELEASE source
>How-To-Repeat:
>Fix:
--- /usr/src.original/sys/kern/sched_ule.c Fri Feb 4 15:13:21 2005
+++ /usr/src/sys/kern/sched_ule.c Fri Aug 5 15:15:38 2005
@@ -51,6 +51,10 @@
#include <sys/uio.h>
#include <sys/ktrace.h>
#endif
+#include "opt_ddb.h"
+#ifdef DDB
+#include <ddb/ddb.h>
+#endif
#include <machine/cpu.h>
#include <machine/smp.h>
@@ -1922,3 +1926,104 @@
}
#define KERN_SWITCH_INCLUDE 1
#include "kern/kern_switch.c"
+
+/* DDB command to dump run queues */
+
+#ifdef DDB
+
+static void print_runq(struct runq *rq, char *string1, char *string2)
+{
+ struct rqbits *rqb;
+ int w;
+ int b;
+ int set;
+ int empty;
+ struct kse *kse;
+ int qIndex;
+ char sep;
+
+ /* Check input arguments */
+
+ if ( (rq == NULL) || (string1 == NULL) || (string2 == NULL) )
+ return;
+
+ db_printf(" Run Queue '%s%s' (%p):\n", string1, string2, rq);
+
+ rqb = &rq->rq_status;
+ for (w=0; w < RQB_LEN; w++) {
+ for (b = 0; b < RQB_BPW; b++) {
+ qIndex = (w * RQB_BPW) + b;
+ set = rqb->rqb_bits[w] & (1 << b);
+ empty = TAILQ_EMPTY(&rq->rq_queues[qIndex]);
+ if (empty) {
+ if (set)
+ db_printf(" Pri %3d-%3d: [bit set, but queue is empty]\n",
+ (qIndex*RQ_PPQ), ((qIndex*RQ_PPQ) + (RQ_PPQ-1)));
+ continue;
+ }
+ db_printf(" Pri %3d-%3d: ",
+ (qIndex*RQ_PPQ), ((qIndex*RQ_PPQ) + (RQ_PPQ-1)));
+ if (!set)
+ db_printf("[queue not empty, but bit NOT set]: ");
+
+ sep = ' ';
+ TAILQ_FOREACH(kse, &rq->rq_queues[qIndex], ke_procq) {
+ db_printf("%c %s[%p]", sep, kse->ke_proc->p_comm, kse->ke_thread);
+ sep= ',';
+ }
+ db_printf("\n");
+ }
+ }
+}
+
+DB_SHOW_COMMAND(runq, runq)
+{
+ int i;
+ struct kseq *kseq;
+ struct pcpu *pcpu;
+ struct thread *td;
+
+ /* Dump the run queues for each CPU */
+
+ for (i = 0; i < mp_ncpus; i++) {
+ kseq = &kseq_cpu[i];
+ if (kseq == NULL) {
+ db_printf("? CPU %d has no kseq structure\n", i);
+ continue;
+ }
+
+ /* Output basic information */
+
+ db_printf("CPU %d: Load %d, Load_TimeShare %d",
+ i, kseq->ksq_load, kseq->ksq_load_timeshare);
+#ifdef SMP
+ db_printf(", Load_Transferrable %d\n", kseq->ksq_transferable);
+#else
+ db_printf(", Load Average %d\n", kseq->ksq_sysload);
+#endif
+ db_printf("\n");
+
+ /* Print current thread info */
+
+ pcpu = pcpu_find(i);
+ if (pcpu != NULL) {
+ td = pcpu->pc_curthread;
+ if ( (td != NULL) && (td->td_proc != NULL) ) {
+ db_printf(" Current thread: %s[%p] Prio: %d\n", td->td_proc->p_comm, td, td->td_priority);
+ }
+ }
+
+ /* Now, dump each of the queues */
+
+ print_runq(&kseq->ksq_idle, "Idle", "");
+
+ print_runq(&kseq->ksq_timeshare[0], "Timeshare[0]",
+ ((kseq->ksq_curr == &kseq->ksq_timeshare[0]) ? " [Curr]" : " [Next]"));
+
+ print_runq(&kseq->ksq_timeshare[1], "Timeshare[1]",
+ ((kseq->ksq_curr == &kseq->ksq_timeshare[1]) ? " [Curr]" : " [Next]"));
+ db_printf("\n");
+ }
+
+}
+#endif
>Release-Note:
>Audit-Trail:
>Unformatted:
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