linux-kernel - Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.8.0: Introduction

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Message-ID: <48FEDC63.308@windriver.com>
Date:	Wed, 22 Oct 2008 15:55:15 +0800
From:	Chen Zumeng <zumeng.chen@...driver.com>
To:	Ryo Tsuruta <ryov@...inux.co.jp>
CC:	Bruce Ashfield <bruce.ashfield@...driver.com>,
	Haotian Zhang <haotian.zhang@...driver.com>,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, fernando@....ntt.co.jp
Subject: Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.8.0: Introduction

Chen Zumeng wrote:
> Hi, Ryo Tsuruta
> 
> And our test team want to test bio_tracking as your benchmark reports,
> so would you please send me your test codes? Thanks in advance.
Hi Ryo Tsuruta,

I wonder if you received last email, so I reply this email to ask
for your bio_tracking test codes to generate your benchmark reports
as shown in your website. Thanks in advance :)

Regards,
Zumeng
> 
> Regards,
> Zumeng
> 
> P.S. The following are my changes to avoid schedule_timeout:
> 
> 
> diff --git a/drivers/md/dm-ioband-ctl.c b/drivers/md/dm-ioband-ctl.c
> index a792620..643ca4e 100644
> --- a/drivers/md/dm-ioband-ctl.c
> +++ b/drivers/md/dm-ioband-ctl.c
> @@ -100,6 +100,7 @@ static struct ioband_device 
> *alloc_ioband_device(char *name,
>                         return dp;
>                 }
>         }
> +       spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
> 
>         /*
>          * Prepare its own workqueue as generic_make_request() may
> @@ -133,9 +134,11 @@ static struct ioband_device 
> *alloc_ioband_device(char *name,
>         init_waitqueue_head(&new->g_waitq);
>         init_waitqueue_head(&new->g_waitq_suspend);
>         init_waitqueue_head(&new->g_waitq_flush);
> -       list_add_tail(&new->g_list, &ioband_device_list);
> 
> +       spin_lock_irqsave(&ioband_devicelist_lock, flags);
> +       list_add_tail(&new->g_list, &ioband_device_list);
>         spin_unlock_irqrestore(&ioband_devicelist_lock, flags);
> +
>         return new;
>  }
> ---
> 
> Ryo Tsuruta wrote:
>> Hi Alasdair and all,
>>
>> This is the dm-ioband version 1.8.0 release.
>>
>> Dm-ioband is an I/O bandwidth controller implemented as a device-mapper
>> driver, which gives specified bandwidth to each job running on the same
>> physical device.
>>
>> This release is a minor bug fix and confirmed running on the latest
>> stable kernel 2.6.27.1.
>>
>> - Can be applied to the kernel 2.6.27.1 and 2.6.27-rc5-mm1.
>> - Changes from 1.7.0 (posted on Oct 3, 2008):
>>   - Fix a minor bug in io_limit setting that causes dm-ioband to stop
>>     issuing I/O requests when a large value is set to io_limit.
>>
>> Alasdair, could you please review this patch and give me any comments?
>>
>> Thanks,
>> Ryo Tsuruta
>> -- 
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> 
> 

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