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Re: GC and stack marking
From: |
David Kastrup |
Subject: |
Re: GC and stack marking |
Date: |
Thu, 22 May 2014 07:37:27 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) |
Daniel Colascione <address@hidden> writes:
> On 05/21/2014 07:43 PM, Eli Zaretskii wrote:
>>> Date: Wed, 21 May 2014 16:49:22 -0400
>>> From: Barry OReilly <address@hidden>
>>> Cc: address@hidden
>>>
>>> Even if we're only talking about the stack variables in the frames that are
>>> active during your particular problematic case (and perhaps in the idle
>>> Emacs GC case)?
>>
>> I thought you were asking about having the compiler generate the code
>> to do that, which would then happen everywhere.
>>
>> If you propose doing that selectively, I don't know how this would be
>> possible, since on the C level you don't have a way of telling how
>> much stack is allocated in a given function.
>>
>>> Have you already ruled out whether stack_top_variable contributes one of
>>> the bytes in your false positive lookup in the mem_node tree?
>>
>> Yes. I looked at all the local variables in that stack frame, and
>> their addresses on the stack are different from the one that triggers
>> the problem.
>
> What about cleaning the stack (memset from the top to the high water
> mark) every once in a while?
How about explicitly triggering garbage collection at a point of time
where the water mark is really low? For the few remaining variables,
initializing them explicitly would then not be a high cost.
--
David Kastrup
- Re: GC and stack marking, (continued)
- Re: GC and stack marking, Eli Zaretskii, 2014/05/24
- Re: GC and stack marking, Daniel Colascione, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
- Re: GC and stack marking, Stefan Monnier, 2014/05/20
- Re: GC and stack marking, Eli Zaretskii, 2014/05/20
Re: GC and stack marking, Barry OReilly, 2014/05/21
Re: GC and stack marking, Barry OReilly, 2014/05/22
Re: GC and stack marking, Eli Zaretskii, 2014/05/22