Re: svn commit: r237660 - head/lib/libc/gen

[David Xu]

On 2012/6/28 4:32, Konstantin Belousov wrote:

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;

Will this make controlling the number of CPU online or CPU hotplug
be impossible on FreeBSD ?

Regards,
David Xu


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