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Date:      Sun, 15 Nov 2009 23:53:10 +0000 (UTC)
From:      Kip Macy <kmacy@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-user@freebsd.org
Subject:   svn commit: r199303 - user/kmacy/releng_8_fcs_buf/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Message-ID:  <200911152353.nAFNrA8U051627@svn.freebsd.org>
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Author: kmacy
Date: Sun Nov 15 23:53:09 2009
New Revision: 199303
URL: http://svn.freebsd.org/changeset/base/199303

Log:
  make tunable for disabling freeing of buffers to the page cache

Modified:
  user/kmacy/releng_8_fcs_buf/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c

Modified: user/kmacy/releng_8_fcs_buf/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- user/kmacy/releng_8_fcs_buf/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Sun Nov 15 23:51:59 2009	(r199302)
+++ user/kmacy/releng_8_fcs_buf/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Sun Nov 15 23:53:09 2009	(r199303)
@@ -187,7 +187,9 @@ SYSCTL_QUAD(_vfs_zfs, OID_AUTO, arc_min,
 SYSCTL_INT(_vfs_zfs, OID_AUTO, mdcomp_disable, CTLFLAG_RDTUN,
     &zfs_mdcomp_disable, 0, "Disable metadata compression");
 
-static int page_cache_disable = 1;
+static int zfs_page_cache_disable = 0;
+SYSCTL_INT(_vfs_zfs, OID_AUTO, page_cache_disable, CTLFLAG_RDTUN,
+    &zfs_page_cache_disable, 0, "Disable backing ARC with page cache ");
 
 #ifdef ZIO_USE_UMA
 extern kmem_cache_t	*zio_buf_cache[];
@@ -1389,7 +1391,7 @@ arc_getblk(arc_buf_t *buf)
 		data = zio_buf_alloc(size);
 	} else if ((buf->b_hdr->b_flags & ARC_BUF_CLONING) ||
 	    BUF_EMPTY(buf->b_hdr) ||
-		page_cache_disable) {
+		zfs_page_cache_disable) {
 		newbp = geteblk(size, flags);
 		data = newbp->b_data;		
 	} else {
@@ -1402,7 +1404,7 @@ arc_getblk(arc_buf_t *buf)
 	if ((buf->b_hdr->b_flags & ARC_BUF_CLONING) &&
 	    (size >= PAGE_SIZE) &&
 	    (!BUF_EMPTY(buf->b_hdr)) &&
-		!page_cache_disable)
+		!zfs_page_cache_disable)
 		arc_binval(buf, blkno, vp, size, flags, newbp);
 	buf->b_hdr->b_flags &= ~ARC_BUF_CLONING;
 
@@ -3474,7 +3476,7 @@ arc_write_done(zio_t *zio)
 		    (bp != NULL) &&
 		    (bp->b_bufobj == NULL) &&
 		    (bp->b_bcount >= PAGE_SIZE) &&
-			!page_cache_disable) {
+			!zfs_page_cache_disable) {
 			arc_binval(buf, blkno, vp, bp->b_bcount, 0, bp);
 		}

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