svn commit: r266801 - projects/sendfile/sys/kern

[Gleb Smirnoff]

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);