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From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Wed, 28 May 2014 12:48:24 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject: svn commit: r266801 - projects/sendfile/sys/kern
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Author: glebius
Date: Wed May 28 12:48:24 2014
New Revision: 266801
URL: http://svnweb.freebsd.org/changeset/base/266801

Log:
  When grabbing pages for readahead, bail out if we encounter a valid page.
  
  Sponsored by:	Netflix
  Sponsored by:	Nginx, Inc.

Modified:
  projects/sendfile/sys/kern/uipc_syscalls.c

Modified: projects/sendfile/sys/kern/uipc_syscalls.c
==============================================================================
--- projects/sendfile/sys/kern/uipc_syscalls.c	Wed May 28 12:45:27 2014	(r266800)
+++ projects/sendfile/sys/kern/uipc_syscalls.c	Wed May 28 12:48:24 2014	(r266801)
@@ -2783,6 +2783,11 @@ sendfile_swapin(vm_object_t obj, struct 
 				count = j - i;
 				break;
 			}
+			if (pa[j]->valid) {
+				vm_page_xunbusy(pa[j]);
+				count = j - i;
+				break;
+			}
 		}
 
 		refcount_acquire(&sfio->nios);