linux-kernel - Re: [PATCH v2 1/1] mmc: block: Add write packing control

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Message-ID: <0bfe25272b45f6ebaa9fe74297d47d02.squirrel@www.codeaurora.org>
Date:	Tue, 12 Jun 2012 13:08:10 -0700 (PDT)
From:	merez@...eaurora.org
To:	"Muthu Kumar" <muthu.lkml@...il.com>
Cc:	"Maya Erez" <merez@...eaurora.org>, linux-mmc@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	"DOCUMENTATION" <linux-doc@...r.kernel.org>,
	"open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] mmc: block: Add write packing control


On Mon, June 11, 2012 5:28 pm, Muthu Kumar wrote:
> On Mon, Jun 11, 2012 at 2:19 PM, Muthu Kumar <muthu.lkml@...il.com> wrote:
>> On Fri, Jun 1, 2012 at 11:55 AM, Maya Erez <merez@...eaurora.org> wrote:
>>> The write packing control will ensure that read requests latency is
>>> not increased due to long write packed commands.
>>>
>>> The trigger for enabling the write packing is managing to pack several
>>> write requests. The number of potential packed requests that will
>>> trigger
>>> the packing can be configured via sysfs by writing the required value
>>> to:
>>> /sys/block/<block_dev_name>/num_wr_reqs_to_start_packing.
>>> The trigger for disabling the write packing is fetching a read request.
>>>
>>
>> If it is applicable only to MMC why do we have this sysfs attr for all
>> block devices?
>
> Just to be clear, please create a directory, say mmc, under
> /sys/block/<dev>/ and create the attr inside that.
>
> You can refer to dm (dm-sysfs.c) for sample implementation.
>
> Regards,
> Muthu
>

I will apply this change in the next patch.

Thanks,
Maya Erez

-- 
Sent by consultant of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum

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