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Diffstat (limited to 'microkernel/mach/gnumach/memory_management.mdwn')
| -rw-r--r-- | microkernel/mach/gnumach/memory_management.mdwn | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/microkernel/mach/gnumach/memory_management.mdwn b/microkernel/mach/gnumach/memory_management.mdwn index c630af05..3e158b7c 100644 --- a/microkernel/mach/gnumach/memory_management.mdwn +++ b/microkernel/mach/gnumach/memory_management.mdwn @@ -48,6 +48,7 @@ License|/fdl]]."]]"""]] <braunr> and mmu management <braunr> (but maybe that's what you meant by physical memory) + ## IRC, freenode, #hurd, 2011-02-16 <braunr> antrik: youpi added it for xen, yes @@ -119,3 +120,16 @@ License|/fdl]]."]]"""]] <braunr> there is issue with watch ./slabinfo which turned in a infinite loop, but it didn't affect the stability of the system <braunr> actually with a 64-bits kernel, we could use a 4/x split + + +# IRC, freenode, #hurd, 2012-08-10 + + <braunr> all modern systems embed the kernel in every address space + <braunr> which allows reduced overhead when making a system call + <braunr> sometimes there is no context switch at all + <braunr> on i386, there are security checks to upgrade the privilege level + (switch to ring 0), and when used, kernel page tables are global, so + they're not flushed + <braunr> using sysenter/sysexit makes it even faster + +[[open_issues/system_call_mechanism]]. |