linux-kernel - Re: [PATCH 10/13] perf kvm: add live mode

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Date:	Thu, 09 May 2013 17:45:53 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, acme@...stprotocols.net,
	mingo@...nel.org, fweisbec@...il.com, peterz@...radead.org,
	jolsa@...hat.com, xiaoguangrong@...ux.vnet.ibm.com
Subject: Re: [PATCH 10/13] perf kvm: add live mode

On Wed,  8 May 2013 22:31:46 -0600, David Ahern wrote:
[SNIP]
> +static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
> +{
> +	struct itimerspec new_value;
> +	struct timespec now;
> +	int rc = -1;
> +
> +	kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
> +	if (kvm->timerfd < 0) {
> +		pr_err("timerfd_create failed\n");
> +		goto out;
> +	}
> +
> +	if (clock_gettime(CLOCK_MONOTONIC, &now) != 0) {
> +		pr_err("clock_gettime failed: %d\n", errno);
> +		close(kvm->timerfd);
> +		goto out;
> +	}
> +
> +	new_value.it_value.tv_sec = now.tv_sec + kvm->display_time;
> +	new_value.it_value.tv_nsec = now.tv_nsec;
> +	new_value.it_interval.tv_sec = kvm->display_time;
> +	new_value.it_interval.tv_nsec = 0;
> +
> +	if (timerfd_settime(kvm->timerfd, TFD_TIMER_ABSTIME,
> +			    &new_value, NULL) != 0) {

Looks like no need to use ABSTIME.

Thanks,
Namhyung
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