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2015-01-02T13:10:33Z stassats: ppc seems to be actually broken
2015-01-02T13:11:44Z stassats: can't start a saved core
2015-01-02T13:12:11Z stassats: at gc_init
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2015-01-02T13:18:51Z stassats: and it tries to mmap 1073741824 bytes
2015-01-02T13:18:59Z stassats: sounds wrong to me
2015-01-02T13:21:11Z stassats: that's with --dynamic-space-size=2GB, 1GB works
2015-01-02T13:22:41Z stassats: it first mmaps 2147483648 then 1073741824
2015-01-02T13:23:01Z stassats: 3GB in total, pushing the limits of 32-bits
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2015-01-02T13:34:41Z stassats: on x86-64, this gc init thing allocates 6GB for a 12GB dynamic-space
2015-01-02T13:35:46Z stassats: so, we have a broken GC this release, fun
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2015-01-02T13:45:34Z stassats: i should have insisted on reverting the change and waiting until the next release
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2015-01-02T14:18:01Z Krystof: I'm so glad we made binaries for everything
2015-01-02T14:18:27Z nyef: ... dare I ask?
2015-01-02T14:18:30Z stassats: it's only semibroken, 1.5 times larger memory footprint
2015-01-02T14:18:48Z Krystof: serves people right for trying to run things on low-memory systems
2015-01-02T14:18:50Z stassats: nyef: the new gc wiping thing allocates half the DS size
2015-01-02T14:18:58Z stassats: to mark what can be wiped
2015-01-02T14:19:14Z nyef: Ouch.
2015-01-02T14:19:40Z nyef: Half the size of DYNAMIC SPACE?
2015-01-02T14:19:44Z stassats: yes
2015-01-02T14:19:53Z hzp2015: Bah.  Cool kinds are running cheneygc-only platforms anyway.
2015-01-02T14:20:13Z nyef: hzp2015: So, MIPS, HPPA, Alpha, ARM, SPARC, and PPC, all without threads?
2015-01-02T14:20:36Z hzp2015: HPPA, Alpha are dead, so I'm not counting them.
2015-01-02T14:20:54Z hzp2015: The cheneygc-only platforms are currently ARM and MIPS, if I'm not mistaken.
2015-01-02T14:20:55Z nyef: Half the dynamic space size is stunning, as you only need one bit per two heap words.
2015-01-02T14:21:16Z nyef: Alpha and HPPA are still not converted to gencgc.
2015-01-02T14:21:46Z nyef: ... I thought ARM supported gencgc these days?
2015-01-02T14:21:52Z stassats: it does
2015-01-02T14:22:05Z hzp2015: Oh, cool.
2015-01-02T14:22:12Z Krystof: happy new year :)
2015-01-02T14:22:31Z nyef: It seems like just over a year ago we had fiveop in here asking about working on the ARM port.
2015-01-02T14:24:28Z stassats: hm, ARM does something funny to the stack in before i get a chance to check the arguments
2015-01-02T14:25:33Z nyef: ARM calling convention is subtly different, IIRC. Plus there's that whole control-stack-pointer-in-static-symbol thing.
2015-01-02T14:26:12Z stassats: i get (FOO 1 2 3 NIL #<code object FOO {536E6007}> 6 7 8)
2015-01-02T14:26:28Z nyef: That's neat...
2015-01-02T14:26:59Z nyef: Why and how are you catching what looks to be reg_CODE?
2015-01-02T14:27:32Z stassats: in the backtrace printer, accessing stack arg passing locations
2015-01-02T14:28:09Z nyef: And it's supposed to be (FOO 1 2 3 4 5 6 7 8) ?
2015-01-02T14:28:57Z stassats: yes
2015-01-02T14:29:53Z nyef: What changes have you made to the code in call.lisp?
2015-01-02T14:30:38Z stassats: just the verify-argcount
2015-01-02T14:31:16Z nyef: What did you change there?
2015-01-02T14:31:36Z stassats: things
2015-01-02T14:31:50Z stassats: not related to the stack
2015-01-02T14:31:58Z nyef: Is xep-allocate-frame being called with or without copy-more-arg-follows?
2015-01-02T14:32:24Z stassats: in this case, without
2015-01-02T14:33:24Z nyef: So, your CSP has been moved to only cover the expected arguments?
2015-01-02T14:33:50Z stassats: 6 7 8 are there
2015-01-02T14:34:04Z stassats: moving CSP isn't going to rewrite the stack
2015-01-02T14:34:06Z nyef: You then take a trap, so you're looking at... build_fake_control_stack_frames().
2015-01-02T14:34:40Z nyef: ... which stomps a NIL and reg_CODE onto the control stack.
2015-01-02T14:35:56Z nyef: Moving CSP alone doesn't rewrite the stack, moving CSP and taking a trap does.
2015-01-02T14:36:26Z stassats: well then
2015-01-02T14:36:37Z nyef: And that, as they say, is that.
2015-01-02T14:37:14Z nyef: And the quirk to ARM function calling is that ARM always allocates a frame.
2015-01-02T14:37:36Z nyef: And populates the frame pointer, return address, and so on.
2015-01-02T14:37:57Z nyef: I knew there was something slightly different about it due to the insane register pressure.
2015-01-02T14:38:13Z stassats: ok, so, i'll need to check before the stack adjustments
2015-01-02T14:38:40Z stassats: a new vop needed
2015-01-02T14:38:48Z nyef: Honestly? Push the frame-allocation logic (and setting up NFP) to during or after verify-arg-count.
2015-01-02T14:39:06Z stassats: verify-arg-count is safety optional
2015-01-02T14:39:14Z nyef: So after, then.
2015-01-02T14:39:28Z stassats: but if i do not allocate the frame how will the debugger know which frame it is?
2015-01-02T14:39:42Z nyef: Ugh.
2015-01-02T14:39:53Z nyef: Hang about, no.
2015-01-02T14:40:14Z nyef: The "allocation" done is number-stack allocation and *truncating* the control stack.
2015-01-02T14:40:47Z nyef: The stack frame is already allocated, and xep-allocate-frame still sets up the frame link as needed.
2015-01-02T14:42:26Z stassats: still new vop
2015-01-02T14:42:32Z nyef: Yes.
2015-01-02T14:42:55Z stassats: i can't check args before the simple-fun header
2015-01-02T14:43:17Z nyef: And still an opportunity to coalesce whatever logic is required from copy-more-arg that has been duplicated from xep-allocate-frame.
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