Date: Tue, 29 Dec 2015 21:25:36 +0100
From: Alexandru Moise <00moses.alexander00@gmail.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] cfq-iosched: convert group idle time to jiffies
Message-ID: <20151229202536.GA32129@gmail.com>
References: <20151229201649.GA31593@gmail.com>
 <5682EAED.9070401@kernel.dk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <5682EAED.9070401@kernel.dk>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1308
Lines: 33

On Tue, Dec 29, 2015 at 01:19:57PM -0700, Jens Axboe wrote:
> On 12/29/2015 01:16 PM, Alexandru Moise wrote:
> >This patch refers to Jens Axboe's change way back in 2006:
> >7b14e3b52 cfq-iosched: slice expiry fixups
> >
> >In this patch he fixed a potential timer race condition by delaying
> >idle_slice_timer by the slice_idle time value.
> >
> >Today this timer is delayed by either slice_idle or group_idle time
> >values, which on my system, and according to
> >Documentation/block/cfq-iosched.txt the default value for group_idle
> >is 8ms.
> >
> >Since the time given by group_idle is supposed to be in milliseconds
> >we should convert that value from milliseconds to jiffies before
> >adding it to jiffies variable and setting our timer.
> 
> Again, the slice idle values are stored in jiffies, there's no need
> to convert. I think you are missing the fact that we display the
> value in msecs, and convert when displaying/storing through sysfs.
> 
> -- 
> Jens Axboe
> 

Damn, yeah just saw the conversion in the STORE/SHOW_FUNCTION macros.

My bad..
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/