[9fans] how big?

[erik quanstrom <quanstro@labs.coraid.com>]

so i was looking at what's going on with gs.  it appears to be having
ape issues.  but along the way this cropped up:

; ps -a | grep gs
quanstro      79590    0:04   0:03  4292893752K Broken   gs -dNOPAUSE -dDELAYSAFER -sDEVICE=plan9 -sOutputFile=/fd/3 -dQUIET -r100 -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -

that's interesting.  4TB of memory.  i don't recall having that much
memory.  /proc/79590/segment looks a little more reasonable, and
hints at the problem, with the bucky bit being set

; cat /proc/79590/segment
Stack     defff000 dffff000    1
Text   R  00001000 00232000    1
Data      00232000 002b8000    1
Bss       002b8000 8170f000    1

it turns out to be a sign extension problem in devproc.
since we need to face up to 64 bits at some point, i just
used a uvlong


/n/dump/2011/0428/sys/src/9/port/devproc.c:677,682 - devproc.c:677,683
  	char *a, flag[10], *sps, *srv, statbuf[NSEG*64];
  	int i, j, m, navail, ne, pid, rsize;
  	long l;
+ 	uvlong u;
  	uchar *rptr;
  	ulong offset;
  	Confmem *cm;
/n/dump/2011/0428/sys/src/9/port/devproc.c:857,869 - devproc.c:858,870
  			readnum(0, statbuf+j+NUMSIZE*i, NUMSIZE, l, NUMSIZE);
  		}
  		/* ignore stack, which is mostly non-existent */
- 		l = 0;
+ 		u = 0;
  		for(i=1; i<NSEG; i++){
  			s = p->seg[i];
  			if(s)
- 				l += s->top - s->base;
+ 				u += s->top - s->base;
  		}
- 		readnum(0, statbuf+j+NUMSIZE*6, NUMSIZE, l>>10, NUMSIZE);
+ 		readnum(0, statbuf+j+NUMSIZE*6, NUMSIZE, u>>10u, NUMSIZE);
  		readnum(0, statbuf+j+NUMSIZE*7, NUMSIZE, p->basepri, NUMSIZE);
  		readnum(0, statbuf+j+NUMSIZE*8, NUMSIZE, p->priority, NUMSIZE);
  		memmove(a, statbuf+offset, n);

a test machine gives more reasonable numbers

; ps -a | grep gs
quanstro        265    0:02   0:01  2120760K Broken   gs -dNOPAUSE -dDELAYSAFER -sDEVICE=plan9 -sOutputFile=/fd/3 -dQUIET -r100 -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -

- erik