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Date: Thu, 23 Jan 2003 15:40:56 -0500
From: Mark Mielke <mark@mark.mielke.cc>
To: Jamie Lokier <jamie@shareable.org>
Cc: Davide Libenzi <davidel@xmailserver.org>,
       Lennert Buytenhek <buytenh@math.leidenuniv.nl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: {sys_,/dev/}epoll waiting timeout
Message-ID: <20030123204056.GC2490@mark.mielke.cc>
References: <20030122065502.GA23790@math.leidenuniv.nl> <20030122080322.GB3466@bjl1.asuk.net> <Pine.LNX.4.50.0301230544320.820-100000@blue1.dev.mcafeelabs.com> <20030123154304.GA7665@bjl1.asuk.net> <20030123172734.GA2490@mark.mielke.cc> <20030123182831.GA8184@bjl1.asuk.net>
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On Thu, Jan 23, 2003 at 06:28:31PM +0000, Jamie Lokier wrote:
> Mark Mielke wrote:
> > Or, fix sys_poll(). With the +1, this means that sys_poll() would have
> > a 1 in 1001 chance per second of returning one jiffie too early.
> Nope.  Read the expression again.

Sorry... not 1 in 1001... almost 100% chance of returning of one
jiffie too many. In practice, even on a relatively idle system,
the process will not be able to wake up as frequently as it might
be able to expect.

mark

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