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

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Date:	Thu, 09 May 2013 07:56:27 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
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 5/9/13 2:45 AM, Namhyung Kim wrote:
> 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.

hmmm.... I did that for a reason. I forget why now. Let me poke around 
with it and see if I can remember.

David

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