Date: Thu, 28 Jun 2012 09:52:09 +0800 From: David Xu <listlog2011@gmail.com> To: Konstantin Belousov <kib@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r237660 - head/lib/libc/gen Message-ID: <4FEBB8C9.8070006@gmail.com> In-Reply-To: <201206272032.q5RKWjvt031174@svn.freebsd.org> References: <201206272032.q5RKWjvt031174@svn.freebsd.org>
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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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