Add "show allpcpu" to DDB, which prints the current CPU id followed by

the per-cpu data for all CPUs.  This is easier to ask users to do than
"figure out how many CPUs you have, now run show pcpu, then run it
once for each CPU you have".

MFC after:	3 days

1 files changed, 36 insertions, 12 deletions

diff --git a/sys/kern/subr_pcpu.c b/sys/kern/subr_pcpu.c
index bb58ec6..bacf5ba 100644
--- a/sys/kern/subr_pcpu.c
+++ b/sys/kern/subr_pcpu.c
@@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/lock.h>
 #include <sys/pcpu.h>
 #include <sys/proc.h>
+#include <sys/smp.h>
 #include <ddb/ddb.h>
 
 static struct pcpu *cpuid_to_pcpu[MAXCPU];
@@ -97,21 +98,12 @@ pcpu_find(u_int cpuid)
 }
 
 #ifdef DDB
-DB_SHOW_COMMAND(pcpu, db_show_pcpu)
+
+static void
+show_pcpu(struct pcpu *pc)
 {
-	struct pcpu *pc;
 	struct thread *td;
-	int id;
 
-	if (have_addr)
-		id = ((addr >> 4) % 16) * 10 + (addr % 16);
-	else
-		id = PCPU_GET(cpuid);
-	pc = pcpu_find(id);
-	if (pc == NULL) {
-		db_printf("CPU %d not found\n", id);
-		return;
-	}
 	db_printf("cpuid        = %d\n", pc->pc_cpuid);
 	db_printf("curthread    = ");
 	td = pc->pc_curthread;
@@ -142,4 +134,36 @@ DB_SHOW_COMMAND(pcpu, db_show_pcpu)
 	witness_list_locks(&pc->pc_spinlocks);
 #endif
 }
+
+DB_SHOW_COMMAND(pcpu, db_show_pcpu)
+{
+	struct pcpu *pc;
+	int id;
+
+	if (have_addr)
+		id = ((addr >> 4) % 16) * 10 + (addr % 16);
+	else
+		id = PCPU_GET(cpuid);
+	pc = pcpu_find(id);
+	if (pc == NULL) {
+		db_printf("CPU %d not found\n", id);
+		return;
+	}
+	show_pcpu(pc);
+}
+
+DB_SHOW_COMMAND(allpcpu, db_show_cpu_all)
+{
+	struct pcpu *pc;
+	int id;
+
+	db_printf("Current CPU: %d\n\n", PCPU_GET(cpuid));
+	for (id = 0; id < mp_maxid; id++) {
+		pc = pcpu_find(id);
+		if (pc != NULL) {
+			show_pcpu(pc);
+			db_printf("\n");
+		}
+	}
+}
 #endif