All of lore.kernel.org
 help / color / mirror / Atom feed
From: Feng Tang <feng.tang@intel.com>
To: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@linux.intel.com>,
	Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
	x86@kernel.org, Len Brown <lenb@kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	linux-kernel@vger.kernel.org, gong.chen@linux.intel.com
Subject: Re: [PATCH v4 4/4] timekeeping: utilize the suspend-nonstop clocksource to count suspended time
Date: Wed, 13 Mar 2013 07:09:50 +0800	[thread overview]
Message-ID: <20130312230950.GA10222@feng-snb> (raw)
In-Reply-To: <513F9974.8010909@linaro.org>

On Tue, Mar 12, 2013 at 02:09:08PM -0700, John Stultz wrote:
> On 03/11/2013 08:56 PM, Feng Tang wrote:
 >  	}
> >-	/* re-base the last cycle value */
> >-	tk->clock->cycle_last = tk->clock->read(tk->clock);
> >+
> >+	if (suspendtime_found)
> >+		__timekeeping_inject_sleeptime(tk, &ts_delta);
> >+
> >+	/* Re-base the last cycle value */
> >+	clock->cycle_last = clock->read(clock);
> It seems like since we unconditionally read the clock above, this
> last line could be reworked to be:
>     clock->cycle_last = cycle_now;
> 
> Which would save re-reading the clocksource.
> 
> If you don't have any objections I'll fold that small change into
> your patch.

No objection at all. Thanks!

- Feng

  reply	other threads:[~2013-03-12 23:11 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-12  3:56 [PATCH v4 0/4] Add support for S3 non-stop TSC support Feng Tang
2013-03-12  3:56 ` [PATCH v4 1/4] x86: Add cpu capability flag X86_FEATURE_NONSTOP_TSC_S3 Feng Tang
2013-03-12 21:14   ` John Stultz
2013-03-12  3:56 ` [PATCH v4 2/4] clocksource: Add new feature flag CLOCK_SOURCE_SUSPEND_NONSTOP Feng Tang
2013-03-12  3:56 ` [PATCH v4 3/4] x86: tsc: Add support for new S3_NONSTOP feature Feng Tang
2013-03-12  3:56 ` [PATCH v4 4/4] timekeeping: utilize the suspend-nonstop clocksource to count suspended time Feng Tang
2013-03-12 21:09   ` John Stultz
2013-03-12 23:09     ` Feng Tang [this message]
2013-03-13 19:17 ` [PATCH v4 0/4] Add support for S3 non-stop TSC support John Stultz

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20130312230950.GA10222@feng-snb \
    --to=feng.tang@intel.com \
    --cc=gong.chen@linux.intel.com \
    --cc=hpa@linux.intel.com \
    --cc=jgunthorpe@obsidianresearch.com \
    --cc=john.stultz@linaro.org \
    --cc=lenb@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=rafael.j.wysocki@intel.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.