linux-kernel - Re: [PATCH 2/2] Add a thread cpu time implementation to vDSO

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Message-ID: <4EEF9752.1020404@fb.com>
Date:	Mon, 19 Dec 2011 11:58:10 -0800
From:	Arun Sharma <asharma@...com>
To:	Arun Sharma <asharma@...com>
CC:	<linux-kernel@...r.kernel.org>, Kumar Sundararajan <kumar@...com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	Andy Lutomirski <luto@....EDU>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH 2/2] Add a thread cpu time implementation to vDSO

On 12/19/11 11:51 AM, Arun Sharma wrote:

> +/* Should be optimized away at compile time */
> +static noinline int check_vvar_overflow(void)
> +{
> +	long vcpu_data_offset =  (long) vvaraddr_vcpu_data - VVAR_ADDRESS;
> +	size_t size = (vcpu_data_offset + sizeof(vcpu_data)
> +			+ sizeof(struct vpercpu_data) * CONFIG_NR_CPUS);
> +	return (size>  VVAR_NUM_PAGES * PAGE_SIZE);
> +}

Forgot to drop the "noinline" part (which I had added for debug 
purposes, so I could inspect the generated code). Fixed in my repo.

  -Arun

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