The vDSO ·
The Syscall You Never Make
un
seel
.com · clock_gettime in nanoseconds · no mode switch
vDSO call
— ns
Real syscall
— ns
State
—
User space (ring 3)
Kernel (ring 0)
vvar / seqlock
Fast return
▶ Play
←
→
🔇 Unmute
Reset
Un
seel
.com · The vDSO
Un
seel
.com · The vDSO: Fast System Calls Without Entering the Kernel