> -----Original Message----- > From: owner-freebsd-hack...@freebsd.org [mailto:owner-freebsd- > hack...@freebsd.org] On Behalf Of Ian Lepore > Sent: Thursday, July 12, 2012 6:42 PM > To: Wojciech Puchar > Cc: freebsd-hackers@freebsd.org > Subject: Re: /proc filesystem > > On Tue, 2012-06-19 at 06:47 +0200, Wojciech Puchar wrote: > > that is what i need. > > > > but still need some explanation after using it and reading manual > > > > say: > > PID START END PRT RES PRES REF SHD FL > TP PATH > > 1378 0x400000 0x5ac000 r-x 385 415 2 1 CN- vn > > /usr/local/bin/Xorg > > 1378 0x7ab000 0x7bc000 rw- 17 0 1 0 C-- vn > > /usr/local/bin/Xorg > > 1378 0x7bc000 0x800000 rw- 14 0 1 0 C-- df > > 1378 0x8007ab000 0x8007c3000 r-x 24 0 32 0 CN- vn > > /libexec/ld-elf.so.1 > > 1378 0x8007c3000 0x8007f0000 rw- 43 0 1 0 C-- df > > 1378 0x8007f0000 0x8007f2000 rw- 1 0 4 0 --- dv > > 1378 0x8007f2000 0x8007f4000 rw- 2 0 4 0 --- dv > > 1378 0x8007f4000 0x800874000 rw- 11 0 4 0 --- dv > > 1378 0x800874000 0x800884000 rw- 16 0 4 0 --- dv > > 1378 0x800884000 0x800895000 rw- 10 0 1 0 CN- df > > 1378 0x8009c2000 0x8009c5000 rw- 3 0 1 0 C-- df > > > > 1) Xorg is mapped twice - IMHO first is text/rodata second is data. But > > what "REF" really means here and why it is 2 once and 1 second. > > > > 2) what really PRES ("private resident") means? df (default) mappings are > > IMHO anonymous maps==private data of process. so why RES is nonzero while > > PRES is zero, while on shared code PRES is nonzero and large. what does it > > really means? > > > > thanks. > > > > I'm catching up on threads I was following before I went on vacation, > and it looks like there was never a response to this. I'm interested in > the answers to these questions too, so today I did some spelunking in > the code to see what I could figure out. I don't think I really > understand things too well, but I'll just say what I think I found and > hopefully the experts will correct anything I get wrong. > > I think you're right about the first two mappings in that procstat > output. The REF value is the reference count on the vm object (the > vnode for the exe file, I presume). I think the reason the reference > count is 2 is that one reference is the open file itself, and the other > is the shadow object. I've always been a bit confused about the concept > of shadow objects in freebsd's vm, but I think it's somehow related to > the running processes that are based on that executable vnode. For > example, if another copy of Xorg were running, I think REF would be 3, > and SHD would be 2. > > I don't know why there is no shadow object for the writable data mapping > and why the refcount is only 1 for that.
BSS that doesn't exist in the file? ................................... Andrew Duane Juniper Networks +1 978-589-0551 (o) +1 603-770-7088 (m) adu...@juniper.net _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
