linux-kernel - Re: generic_make_request fucntion for scsi

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Date:	Sat, 20 Jun 2009 21:03:00 +0530
From:	Ravish Tayal <ravish.tayal@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	SCSI development list <linux-scsi@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: generic_make_request fucntion for scsi_disk

Sorry My mistake.
I will take care of it now onwards
regards
Ravish


On Sat, Jun 20, 2009 at 8:26 PM, Alan Stern<stern@...land.harvard.edu> wrote:
> You should use Reply-To-All so that other people reading the mailing
> list will be able to follow and contribute to the thread.
>
> On Sat, 20 Jun 2009, Ravish Tayal wrote:
>
>> Thanks Alan,
>>
>> I am actually trying to profile the time taken by each layer to complete the
>> disk write opertaion as sys_write to queue_command invokation veries alot.
>
> Of course it varies.  The kernel buffers disk writes, shuffles them
> around, and then carries them out when it wants to.  As James has
> pointed out, your write(2) system calls don't directly cause any I/O to
> take place.
>
> Alan Stern
>
>
>
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