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Diffstat (limited to 'microkernel/mach/gnumach/memory_management.mdwn')
| -rw-r--r-- | microkernel/mach/gnumach/memory_management.mdwn | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/microkernel/mach/gnumach/memory_management.mdwn b/microkernel/mach/gnumach/memory_management.mdwn index 43b99d83..ca2f42c4 100644 --- a/microkernel/mach/gnumach/memory_management.mdwn +++ b/microkernel/mach/gnumach/memory_management.mdwn @@ -80,3 +80,25 @@ IRC, freenode, #hurd, 2011-06-09 <braunr> wow <braunr> i remember the linux support for 4G/4G split when there was enough RAM to fill the kernel space with struct page entries + + +IRC, freenode, #hurd, 2011-11-12 + + <youpi> well, the Hurd doesn't "artificially" limits itself to 1.5GiB + memory + <youpi> i386 has only 4GiB addressing space + <youpi> we currently chose 2GiB for the kernel and 2GiB for the userspace + <youpi> since kernel needs some mappings, that leaves only 1.5GiB usable + physical memory + <sea4ever`> Hm? 2GiB for kernel, 2GiB for userspace, 500MiB are used for + what? + <youpi> for mappings + <youpi> such as device iomap + <youpi> contiguous buffer allocation + <youpi> and such things + <sea4ever`> Ah, ok. You map things in kernel space into user space then. + <youpi> linux does the same without the "bigmem" support + <youpi> no, just in kernel space + <youpi> kernel space is what determines how much physical memory you can + address + <youpi> unless using the linux-said-awful "bigmem" support |