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Re: VM cache policy change

From: Justus Winter
Subject: Re: VM cache policy change
Date: Tue, 24 Feb 2015 17:15:22 +0100
User-agent: alot/0.3.5

Quoting Samuel Thibault (2015-02-24 01:04:19)
> I tried to start a gcc-5 build, it gets stuck at the tar x stage, with
> gnumach printing:
> no more room for vm_map_find_entry in 80223e20 (kmem_map_store)
> no more room for kmem_realloc in 80223e20 (kmem_map_store)
> ipc_port              0010      80   4k    50 262239 262350   20988k          
> 0k

kmem_realloc is only used to enlarge the ipc tables, but this is not
due to the lack of space, but due to the lack of a sufficiently large
continuous chunk of the kernel address space.

As demonstrated by the attached program the maximum number of ports a
task can have seems to be around 250000, which doesn't seem like a

% ./test
./test: mach_port_allocate (last good name: 242175): (os/kern) resource shortage

This suggests that we need a different data structure that doesn't
depend on a continuous chunk of memory.


Attachment: test.c
Description: Text Data

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