[haiku-bugs] Re: [Haiku] #14755: Haiku Grinds to a Halt when Dribbling
- From: "Haiku" <trac@xxxxxxxxxxxx>
- To: undisclosed-recipients: ;
- Date: Wed, 12 Dec 2018 16:03:05 -0000
#14755: Haiku Grinds to a Halt when Dribbling
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Reporter: AGMS | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: | Version: R1/Development
System/Kernel |
Resolution: | Keywords: memory fragmentation long duration
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by waddlesplash):
Ideally, the cache would be using memory areas in an address independent
way and you could unmap areas and then remap them in a contiguous address
range.
This is only a problem on 32-bit systems where the address space is easily
exhausted. On 64-bit systems there is so much spare address space that
this is never an issue. So, spending however much time to implement an
"address space defragmenter" is probably not very high on any priority
list; just use a 64-bit build if you need to.
If that's too difficult, the cache low memory detection could also look
for fragmentation.
Failure to insert things into the kernel address space should issue a low-
resource notification; but it didn't because the code was if 0'd out.
hrev52637 (& hrev52639 which amends it) should improve things here
significantly.
Or the media system could stop leaking areas.
Obviously this is a problem. If killing the media_server fixes it, then
that narrows down the possibilities. Though I'm a bit confused here: is it
the kernel address space or the userland address space that gets
fragmented? No matter how fragmented physical memory gets, it should be
possible to allocate (non-contiguous) virtual memory as long as there is
some still free.
The kernel has its own 2GB address space, and each application has its own
2GB; and so even if the user application's address space gets especially
fragmented, the kernel should be fine. (Or am I missing something here?)
Or, are you just plain out of memory altogether?
--
Ticket URL: <
https://dev.haiku-os.org/ticket/14755#comment:1>
Haiku <
https://dev.haiku-os.org>
The Haiku operating system.
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