linux-kernel - VDSO gettimeofday() x86

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Message-ID: <CAAZUjxCvK0QnwnZP_FBiO2JM1rMoEA3HLjKAcYD14cxdGWyg4Q@mail.gmail.com>
Date:	Tue, 16 Oct 2012 13:09:55 -0500
From:	wilson self <wself00@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: VDSO gettimeofday() x86_64 linux 3.2

I noticed recently that my get time of day calls are quite a bit
slower than I would have expected; and it would see that a likely
cause is that they are not going via vdso, but rather a system call.

In older kernels there was kernel.vsyscall64 parameter to enable them,
but this seems to be gone in later kernel releases.  What config
option or parameter might I be missing that could cause gettimeofday()
to use the fallback methods?

Thanks
wilson
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