svn commit: r341180 - head/sys/kern

[Mateusz Guzik]

Author: mjg
Date: Thu Nov 29 04:48:22 2018
New Revision: 341180
URL: https://svnweb.freebsd.org/changeset/base/341180

Log:
  Annotate td_cowgen check as unlikely.
  
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/kern/subr_syscall.c

Modified: head/sys/kern/subr_syscall.c
==============================================================================
--- head/sys/kern/subr_syscall.c	Thu Nov 29 03:57:06 2018	(r341179)
+++ head/sys/kern/subr_syscall.c	Thu Nov 29 04:48:22 2018	(r341180)
@@ -66,7 +66,7 @@ syscallenter(struct thread *td)
 	sa = &td->td_sa;
 
 	td->td_pticks = 0;
-	if (td->td_cowgen != p->p_cowgen)
+	if (__predict_false(td->td_cowgen != p->p_cowgen))
 		thread_cow_update(td);
 	traced = (p->p_flag & P_TRACED) != 0;
 	if (traced || td->td_dbgflags & TDB_USERWR) {