Date: Wed, 10 Nov 2004 19:32:38 -0800 From: Bruce M Simpson <bms@spc.org> To: arch@FreeBSD.ORG Subject: Re: U Area Removal Message-ID: <20041111033238.GA723@empiric.icir.org> In-Reply-To: <20041111030035.GA70923@VARK.MIT.EDU> References: <20041111030035.GA70923@VARK.MIT.EDU>
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Hey there, On Wed, Nov 10, 2004 at 10:00:35PM -0500, David Schultz wrote: > Over the years, the amount of data we have stored in each process' U > area has eroded to the point where all we have left are the following: > > - A struct kinfo_proc that is only used for a.out core dumps. > This can be reconstructed at the time of the core dump, so > it doesn't need to be there. Aren't we 100% ELF these days? Surely aout is no longer relevant? > - The struct pstats for the process, which takes a mere 216 bytes > on i386. That's pretty small. I don't see the rusage or timeval structs growing much for 64-bit platforms. > I propose to remove the ability to swap the U area, allocating p_stats > from malloced memory instead. I think this is a good idea. > http://www.freebsd.org/~das/patches/upages.diff I've briefly looked over this and am happy to see it simplifies MD code somewhat. BMS
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