tty: note an optimization area

diff --git a/Kernel/tty.c b/Kernel/tty.c
index eba4444..1116c4b 100644 (file)
--- a/Kernel/tty.c
+++ b/Kernel/tty.c
@@ -123,6 +123,15 @@ int tty_write(uint8_t minor, uint8_t rawflag, uint8_t flag)
                        if (psleep_flags_io(&t->flag, flag))
                                return udata.u_done;
                }
+               /* We could optimize this significantly by 
+                  a) looping here if not sleeping rather than repeating all
+                  the checks except for STOP/DISCARD
+                  b) possibly batching for the case where tty never blocks
+                  if we have a way to report that. We could then batch except
+                  for conversions and also fast path in vt for 'normal char
+                  next char normal'
+                  c) look at hint/batching for ugetc into a local work buffer
+               */
                if (!(t->flag & TTYF_DISCARD)) {
                        if (udata.u_sysio)
                                c = *udata.u_base;