TheGrebs.com:IRC Logs:#uml:2007:02:21

---	Log	opened Wed Feb 21 00:00:41 2007
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06:40	<pgstudy>	how can i use kprobes with uml?
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07:21	<Lathiat>	howdy guys, just wondering with UML in 2.6.20 these days without devfs what device comes up as the primary console and should be in inittab? (haven't touched uml for a while, used to be ttys/0 :)
07:24	<Lathiat>	hrm, nm, tty0 apparently :)
07:25	<DeHackEd>	I thought it was /dev/console. I think it might be init-dependent.
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11:29	<jdike>	Hi guys
11:29	<DeHackEd>	hello
11:30	<jdike>	So, the noisy fan on my desktop finally died
11:31	<jdike>	and it is much quieter in here
11:31	<DeHackEd>	but how much hotter is the hardware?
11:32	<jdike>	it's still running
11:33	<jdike>	I need a new box anyway
11:33	<jdike>	this thing is 7 years old
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13:41	<pgstudy>	anyone here knows if kprobes can work in uml?
13:42	<jdike>	probably there needs to be architecture support
13:42	<jdike>	but you can always gdb it
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13:44	<pgstudy>	jdike: what do u mean gdb it? for debugging purposes? yes i know. however, i was thinking more of the line of using it to attach my function to a kernel function while developing
13:44	<jdike>	yeah, OK
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13:48	<kokoko1>	jdike, need one minute from you :-S
13:49	<kokoko1>	we are running kernel 2.6.17.11 on all our UMLsl, do you thinks its time to upgrade the UML kernels?
13:49	<jdike>	yes?
13:49	<kokoko1>	Yes we have no issue wth this kernel
13:49	<jdike>	how do you determine whether you want to upgrade?
13:51	<kokoko1>	jdike, I don't know that's why I am asking, actaully i am moving all uml + hosts to FC6 i thinks may be it would be better if i upgrade uml kernel too?
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13:51	<jdike>	if you have no problems, why upgrade?
13:51	<jdike>	there are bug fixes, but you don't seem to be hitting them
13:52	<kokoko1>	hmm yes
13:52	<kokoko1>	Right, thanks for your time :)
13:53	[~]	kokoko1 back to blackstar UML, its kinda pita
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13:55	<jeroenh>	Hello
13:55	<jeroenh>	Is Paolo aka Blaisorblade here by any chance?
14:00	<kokoko1>	!seen bb
14:00	<linbot>	kokoko1: bb was last seen in #uml 35 weeks, 1 day, 22 hours, 16 minutes, and 17 seconds ago: <BB> for me it was only a problem that the remote end seemed to be ignoring the mss and icmp to tell it to fragment
14:00	<jeroenh>	thanks
14:00	<kokoko1>	gracious
14:02	<kokoko1>	I wonders if he run away with money ? :)
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14:07	<jdike>	he's active on the lists, just not here
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15:17	<mode2_>	SaLuT A tOuS !!!!!!!!!!!!!!!!!!!!!!!!!!!
15:18	<mode2_>	bon personne d'interessant j'me casse
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16:51	<er>	hi all
16:54	<er>	i'm trying to insert some code in the UML kernel to monitor the host-memory utilization of processes, and certain library functions
16:55	<er>	so every time a physical page gets mapped into a UML process, i'd like my code to kick in
16:56	<er>	is the SEGV handler a good place to do this?
16:58	<DeHackEd>	I think that handles cases where a userspace app would fault.
16:58	<er>	DeHackEd, that's what I need
16:59	<er>	when a UML process faults because it just touched a page for the first time
17:02	<er>	trap.c:segv
17:02	<DeHackEd>	I guess I don't know enough about the technical operations to be of assistance
17:03	<jdike>	er, the segfault path is a good place for that code
17:03	<er>	DeHackEd, that's OK:) I was thinking out aloud...
17:03	<er>	jdike, thanks.
17:04	<DeHackEd>	and to the best of my knowledge, the UML's memory usage is fixed and not all that freeable (short of going into swap)
17:04	<jdike>	of course on a fork, the child is populated immediately
17:04	<jdike>	and on an exec, it is depopulated
17:05	<jdike>	the segfault path won't notice those
17:09	<er>	jdike, that makes sense
17:09	<er>	on the other hand, fork should populate as COW, so i should still be able to get away with watching segfalts for writes
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17:10	<jdike>	the COWed pages, yes
17:10	<jdike>	but non-COWed pages are still there but you won't see them
17:11	<er>	i basically care about the heap and stack
17:11	<er>	can there be non-cows in there?
17:13	<jdike>	probably not
17:13	<jdike>	non-cows will be readonly stuff and MAP_SHARED writeable stuff
17:14	<er>	right, and they stay the same size in physical memory anyway
17:15	<jdike>	same size?
17:15	<er>	in the sense, that they're not copied, so the amount of physical memory used stays the same
17:16	<jdike>	right
17:16	<er>	but thanks for this, i was looking for corner cases like this
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---	Log	closed Thu Feb 22 00:00:57 2007