Re: systat -vm output showing negative total virtual memory
- From: Ruslan Ermilov <ru@xxxxxxxxxxx>
- Date: Thu, 16 Nov 2006 18:03:09 +0300
On Thu, Nov 16, 2006 at 11:55:09AM +0100, Ulrich Spoerlein wrote:
Hi all,If my reading of the sys/vm/vm_meter.c code is correct, then
this is on a two week old RELENG_6. The machine has 4GB RAM, SMP
CPU: Intel(R) Xeon(TM) CPU 3.00GHz (3012.12-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf43 Stepping = 3
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUS
H,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,CX16,<b14>>
AMD Features=0x20100000<NX,LM>
real memory = 3489071104 (3327 MB)
avail memory = 3414265856 (3256 MB)
ACPI APIC Table: <PTLTD APIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 6
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 1198620 115040 1480676 289860 153004 count
All 3330652 116920 -956751k 293960 pages
vm.vmtotal has this to say
System wide totals computed every five seconds: (values in kilobytes)
===============================================
Processes: (RUNQ: 3 Disk Wait: 1 Page Wait: 1 Sleep: 40)
Virtual Memory: (Total: 815944K, Active 355288K)
Real Memory: (Total: 2558540K Active 150424K)
Shared Virtual Memory: (Total: 11460K Active: 7856K)
Shared Real Memory: (Total: 6916K Active: 5044K)
Free Memory Pages: 890092K
all this is wrong; t_vm, t_avm, t_vmshr, and t_avmshr are all
in bytes (here's a snippet from vm_meter.c):
: totalp->t_vm += object->size;
: totalp->t_rm += object->resident_page_count;
: if (object->flags & OBJ_ACTIVE) {
: totalp->t_avm += object->size;
: totalp->t_arm += object->resident_page_count;
: }
: if (object->shadow_count > 1) {
: /* shared object */
: totalp->t_vmshr += object->size;
: totalp->t_rmshr += object->resident_page_count;
: if (object->flags & OBJ_ACTIVE) {
: totalp->t_avmshr += object->size;
: totalp->t_armshr += object->resident_page_count;
: }
: }
sysctl(8) knows that t_vm is in bytes, but for the other stats
it thinks they are in pages. "systat -vm" thinks they are all
in bytes. Here's a fix:
%%%
Index: sbin/sysctl/sysctl.c
===================================================================
RCS file: /home/ncvs/src/sbin/sysctl/sysctl.c,v
retrieving revision 1.67.2.7
diff -u -p -r1.67.2.7 sysctl.c
--- sbin/sysctl/sysctl.c 8 Sep 2006 09:45:35 -0000 1.67.2.7
+++ sbin/sysctl/sysctl.c 16 Nov 2006 14:51:18 -0000
@@ -395,14 +395,14 @@ S_vmtotal(int l2, void *p)
"%hu Sleep: %hu)\n",
v->t_rq, v->t_dw, v->t_pw, v->t_sl);
printf(
- "Virtual Memory:\t\t(Total: %luK, Active %lldK)\n",
+ "Virtual Memory:\t\t(Total: %luK, Active %luK)\n",
(unsigned long)v->t_vm / 1024,
- (long long)v->t_avm * pageKilo);
+ (unsigned long)v->t_avm / 1024);
printf("Real Memory:\t\t(Total: %lldK Active %lldK)\n",
(long long)v->t_rm * pageKilo, (long long)v->t_arm * pageKilo);
- printf("Shared Virtual Memory:\t(Total: %lldK Active: %lldK)\n",
- (long long)v->t_vmshr * pageKilo,
- (long long)v->t_avmshr * pageKilo);
+ printf("Shared Virtual Memory:\t(Total: %luK Active: %luK)\n",
+ (unsigned long)v->t_vmshr / 1024,
+ (unsigned long)v->t_avmshr / 1024);
printf("Shared Real Memory:\t(Total: %lldK Active: %lldK)\n",
(long long)v->t_rmshr * pageKilo,
(long long)v->t_armshr * pageKilo);
Index: usr.bin/systat/vmstat.c
===================================================================
RCS file: /home/ncvs/src/usr.bin/systat/vmstat.c,v
retrieving revision 1.60.2.1
diff -u -p -r1.60.2.1 vmstat.c
--- usr.bin/systat/vmstat.c 21 Mar 2006 20:49:50 -0000 1.60.2.1
+++ usr.bin/systat/vmstat.c 16 Nov 2006 14:55:32 -0000
@@ -475,12 +475,12 @@ showkre()
#define pgtokb(pg) ((pg) * (s.v_page_size / 1024))
putint(pgtokb(total.t_arm), MEMROW + 2, MEMCOL + 3, 8);
putint(pgtokb(total.t_armshr), MEMROW + 2, MEMCOL + 11, 8);
- putint(pgtokb(total.t_avm), MEMROW + 2, MEMCOL + 19, 9);
- putint(pgtokb(total.t_avmshr), MEMROW + 2, MEMCOL + 28, 9);
+ putint(total.t_avm/1024, MEMROW + 2, MEMCOL + 19, 9);
+ putint(total.t_avmshr/1024, MEMROW + 2, MEMCOL + 28, 9);
putint(pgtokb(total.t_rm), MEMROW + 3, MEMCOL + 3, 8);
putint(pgtokb(total.t_rmshr), MEMROW + 3, MEMCOL + 11, 8);
- putint(pgtokb(total.t_vm), MEMROW + 3, MEMCOL + 19, 9);
- putint(pgtokb(total.t_vmshr), MEMROW + 3, MEMCOL + 28, 9);
+ putint(total.t_vm/1024, MEMROW + 3, MEMCOL + 19, 9);
+ putint(total.t_vmshr/1024, MEMROW + 3, MEMCOL + 28, 9);
putint(pgtokb(total.t_free), MEMROW + 2, MEMCOL + 37, 8);
putint(total.t_rq - 1, PROCSROW + 1, PROCSCOL + 3, 3);
putint(total.t_pw, PROCSROW + 1, PROCSCOL + 6, 3);
%%%
Cheers,
--
Ruslan Ermilov
ru@xxxxxxxxxxx
FreeBSD committer
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