I'm interested in understanding better why the value of ac_mem in the BSD process accounting code (linux/kernel/acct.c) is calculated the way it is. My humble uninformed opinion is that it's current definition is possibly misleading at best and mostly useless at worst. As a little background: The comment in include/linux/acct.h says ac_mem is "Average Memory Usage". According to BSD sources, ac_mem in BSD looks like a time-averaged resident set size: acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t; (http://minnie.tuhs.org/FreeBSD-srctree/newsrc/kern/kern_acct.c.html) But the code in linux/kernel/acct.c indicates that ac_mem is simply the vmsize (in KB) at the time acct_process() is called from do_exit(). It does not appear to be an average, and IMHO, vmsize is nearly useless, especially if one expects RSS. Does it make sense to others that ac_mem should be changed to reflect the resident set size? Cheers, Doug - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
