diff options
Diffstat (limited to 'sys/kern/kern_switch.c')
| -rw-r--r-- | sys/kern/kern_switch.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/kern/kern_switch.c b/sys/kern/kern_switch.c index 885dc22..d0009b1 100644 --- a/sys/kern/kern_switch.c +++ b/sys/kern/kern_switch.c @@ -176,6 +176,12 @@ retry: /* * Kernel thread preemption implementation. Critical sections mark * regions of code in which preemptions are not allowed. + * + * It might seem a good idea to inline critical_enter() but, in order + * to prevent instructions reordering by the compiler, a __compiler_membar() + * would have to be used here (the same as sched_pin()). The performance + * penalty imposed by the membar could, then, produce slower code than + * the function call itself, for most cases. */ void critical_enter(void) |
