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Date: Wed, 20 Oct 2010 13:41:05 +0800
From: Cong Wang <amwang@redhat.com>
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To: Andi Kleen <ak@linux.intel.com>
CC: Andreas Schwab <schwab@redhat.com>, linux-kernel@vger.kernel.org,
        Randy Dunlap <rdunlap@xenotime.net>,
        Mauro Carvalho Chehab <mchehab@redhat.com>,
        Len Brown <len.brown@intel.com>, Ingo Molnar <mingo@elte.hu>,
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        David Howells <dhowells@redhat.com>, Eric Paris <eparis@redhat.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Eric Dumazet <eric.dumazet@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Andy Shevchenko <ext-andriy.shevchenko@nokia.com>,
        linux-doc@vger.kernel.org
Subject: Re: [PATCH 2/2] sysctl: remove sysctl syscall
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On 10/19/10 23:05, Andi Kleen wrote:
> On 10/19/2010 4:10 PM, Andreas Schwab wrote:
>>> On 10/19/2010 10:22 AM, Amerigo Wang wrote:
>>>> Remove the obsolete sysctl syscall. It was scheduled
>>>> to be removed in Sept.
>>>
>>> I thought at least older glibc was still using it? Did anyone check
>>> what happens if it sees no sysctl(2)?
>> It will fall back reading from /proc/sys.
>
> First that's slow (but ok), but that will fail if there is no /proc.
>

I strongly doubt glibc will work if there is no /proc,
a quick grep shows lots of "/proc" strings in glibc code.