svn commit: r237660 - head/lib/libc/gen
David Xu
listlog2011 at gmail.com
Thu Jun 28 01:52:15 UTC 2012
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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