[src/trunk]: src/sys/sys Use multiple cache lines for fd_dfdfile elements whe...

[mlelstv <mlelstv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/964ec395e69a
branches:  trunk
changeset: 460075:964ec395e69a
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Sun Oct 06 07:15:34 2019 +0000

description:
Use multiple cache lines for fd_dfdfile elements when necessary.

diffstat:

 sys/sys/filedesc.h |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 5ed0b726fd90 -r 964ec395e69a sys/sys/filedesc.h
--- a/sys/sys/filedesc.h        Sun Oct 06 06:10:44 2019 +0000
+++ b/sys/sys/filedesc.h        Sun Oct 06 07:15:34 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: filedesc.h,v 1.64 2017/12/26 08:30:58 kamil Exp $      */
+/*     $NetBSD: filedesc.h,v 1.65 2019/10/06 07:15:34 mlelstv Exp $    */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -112,6 +112,8 @@
        kcondvar_t      ff_closing;     /* d: notifier for close */
 } fdfile_t;
 
+#define FDFILE_SIZE ((sizeof(fdfile_t)+CACHE_LINE_SIZE-1)/CACHE_LINE_SIZE*CACHE_LINE_SIZE)
+
 /* Reference count */
 #define        FR_CLOSING      (0x80000000)    /* closing: must interlock */
 #define        FR_MASK         (~FR_CLOSING)   /* reference count */
@@ -132,7 +134,7 @@
         * Built-in fdfile_t records first, since they have strict
         * alignment requirements.
         */
-       uint8_t         fd_dfdfile[NDFDFILE][CACHE_LINE_SIZE];
+       uint8_t         fd_dfdfile[NDFDFILE][FDFILE_SIZE];
        /*
         * All of the remaining fields are locked by fd_lock.
         */