MFC r323235,r323236,r324789,r324863:

    Introduce __read_frequently

    While __read_mostly groups variables together, their placement is not
    specified. In particular 2 frequently used variables can end up in
    different lines.

    This annotation is only expected to be used for variables read all the time,
    e.g. on each syscall entry.

=============

    Sprinkle __read_frequently on few obvious places.

    Note that some of annotated variables should probably change their types
    to something smaller, preferably bit-sized.

=============

    Mark kdb_active as __read_frequently and switch to bool to eat less space.

=============

    Change kdb_active type to u_char.

    Fixes warnings from gcc and keeps the small size. Perhaps nesting should be moved
    to another variablle.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/kern/kern_dtrace.c b/sys/kern/kern_dtrace.c
index f5f14b7..adc36a8 100644
--- a/sys/kern/kern_dtrace.c
+++ b/sys/kern/kern_dtrace.c
@@ -54,7 +54,7 @@ dtrace_doubletrap_func_t	dtrace_doubletrap_func;
 dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
 dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
 
-systrace_probe_func_t		systrace_probe_func;
+systrace_probe_func_t __read_frequently	systrace_probe_func;
 
 /* Return the DTrace process data size compiled in the kernel hooks. */
 size_t