From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Fri,  6 Mar 2015 08:37:07 -0800
To: 9fans@9fans.net
Message-ID: <5deb4ebaa628252c1426ee4123f1b12b@lilly.quanstro.net>
In-Reply-To: <4ded1a4925644d91062f08d7b30a57a2@quintile.net>
References: <4ded1a4925644d91062f08d7b30a57a2@quintile.net>
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Subject: Re: [9fans] leak(1)
Topicbox-Message-UUID: 486a15c4-ead9-11e9-9d60-3106f5b1d025

On Fri Mar  6 01:33:22 PST 2015, steve@quintile.net wrote:
> I am getting an error from leak(1):
>
> 	<stdin>:2: (error) mainmem used but not set
>
> Anyone seen such, understand, or even know where its coming from?

i had to use some patches to acidleak to keep it from running out of
memory on medium-sized heaps due to a pathological case in the pool
allocator.  (plus, linear allocation usually ends in tears):

; 9diff acidleak.c
/n/sources/plan9/sys/src/cmd/aux/acidleak.c:202,213 - acidleak.c:202,211
  		p[Blinelen(&bio)-1] = '\0';
  		nf = tokenize(p, f, nelem(f));
  		if(nf >= 4 && strcmp(f[0], "data") == 0) {
- 			if(ndata >= adata){
+ 			if(ndata == adata){
  				if(adata == 0)
  					adata = 4096;
- 				else
- 					adata += adata / 4;  /* increase 25% */
- 				data = erealloc(data, adata * sizeof(Data));
+ 				data = erealloc(data, (adata <<= 1)*sizeof(Data));
  			}
  			data[ndata].addr = strtoul(f[1], nil, 0);
  			data[ndata].val = strtoul(f[2], nil, 0);
/n/sources/plan9/sys/src/cmd/aux/acidleak.c:215,228 - acidleak.c:213,223
  			data[ndata].b = 0;
  			ndata++;
  		}
- 		if(nf >= 5 &&
- 		    (strcmp(f[0], "block") == 0 || strcmp(f[0], "free") == 0)) {
- 			if(nblock >= ablock){
+ 		if(nf >= 5 && (strcmp(f[0], "block") == 0 || strcmp(f[0], "free") == 0)) {
+ 			if(nblock == ablock){
  				if(ablock == 0)
  					ablock = 4096;
- 				else
- 					ablock += ablock / 4; /* increase 25% */
- 				block = erealloc(block, ablock * sizeof(Block));
+ 				block = erealloc(block, (ablock <<= 1)*sizeof(Block));
  			}
  			block[nblock].addr = strtoul(f[1], nil, 0);
  			block[nblock].size = strtoul(f[2], nil, 0);

- erik