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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 27 Jun 2012 20:32:45 +0000 (UTC)
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Subject: svn commit: r237660 - head/lib/libc/gen
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Author: kib
Date: Wed Jun 27 20:32:45 2012
New Revision: 237660
URL: http://svn.freebsd.org/changeset/base/237660

Log:
  Optimize the handling of SC_NPROCESSORS_CONF, by using auxv AT_NCPU
  value if present.
  
  MFC after:	1 week

Modified:
  head/lib/libc/gen/sysconf.c

Modified: head/lib/libc/gen/sysconf.c
==============================================================================
--- head/lib/libc/gen/sysconf.c	Wed Jun 27 20:24:25 2012	(r237659)
+++ head/lib/libc/gen/sysconf.c	Wed Jun 27 20:32:45 2012	(r237660)
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/resource.h>
 #include <sys/socket.h>
 
+#include <elf.h>
 #include <errno.h>
 #include <limits.h>
 #include <paths.h>
@@ -51,6 +52,7 @@ __FBSDID("$FreeBSD$");
 
 #include "../stdlib/atexit.h"
 #include "tzfile.h"		/* from ../../../contrib/tzcode/stdtime */
+#include "libc_private.h"
 
 #define	_PATH_ZONEINFO	TZDIR	/* from tzfile.h */
 
@@ -585,6 +587,8 @@ yesno:
 
 	case _SC_NPROCESSORS_CONF:
 	case _SC_NPROCESSORS_ONLN:
+		if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
+			return ((long)value);
 		mib[0] = CTL_HW;
 		mib[1] = HW_NCPU;
 		break;