Date: Thu, 24 Mar 2011 10:29:46 -0400 From: Jung-uk Kim <jkim@FreeBSD.org> To: David Malone <dwmalone@maths.tcd.ie> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>, Bruce Evans <brde@optusnet.com.au> Subject: Re: svn commit: r219676 - head/sys/x86/x86 Message-ID: <201103241029.57358.jkim@FreeBSD.org> In-Reply-To: <201103241358.aa30354@walton.maths.tcd.ie> References: <201103241358.aa30354@walton.maths.tcd.ie>
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On Thursday 24 March 2011 09:58 am, David Malone wrote: > > No new ones. Just the old ones of updating the frequency and all > > related variables without races. > > Is something simple, line an atomic write, an option for this? I > guess we don't have 64-bit atomic writes on all platforms, but we > could support it on some platforms. If atomic 64-bit read/write is possible and it is absolutely necessary, it has to be set via machdep.foo_freq, not kern.timecounter.foo.frequency. Jung-uk Kim
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