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-rw-r--r--microkernel/mach/gnumach/projects/mach_5.mdwn4
1 files changed, 4 insertions, 0 deletions
diff --git a/microkernel/mach/gnumach/projects/mach_5.mdwn b/microkernel/mach/gnumach/projects/mach_5.mdwn
index bf678556..73aaef99 100644
--- a/microkernel/mach/gnumach/projects/mach_5.mdwn
+++ b/microkernel/mach/gnumach/projects/mach_5.mdwn
@@ -105,6 +105,10 @@ sysenter improves our IPC performance by ~10%.
### Implementation
+One trouble with sysenter/sysexit (or the amd equivalent) isn't
+available on all processors. Linux solves this using the VDSO
+mechanism.
+
I'd like to implement something similar:
1. There is a platform dependent way to map a special page.