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pc kernel: make imagemem maxsize 10% less of mainmem maxsize

--- a/sys/src/9/pc/main.c

+++ b/sys/src/9/pc/main.c

@@ -461,7 +461,7 @@

 	 * the dynamic allocation will balance the load properly,

 	 * hopefully. be careful with 32-bit overflow.

 	 */

-	imagmem->maxsize = mainmem->maxsize;

+	imagmem->maxsize = kpages - (kpages/10);

 	if(p = getconf("*imagemaxmb")){

 		imagmem->maxsize = strtol(p, nil, 0)*MB;

 		if(imagmem->maxsize > mainmem->maxsize)

-- 

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