From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ravish Tayal Subject: Re: generic_make_request fucntion for scsi_disk Date: Sat, 20 Jun 2009 21:03:00 +0530 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Kernel development list , linux-fsdevel@vger.kernel.org, SCSI development list , USB list To: Alan Stern Return-path: Received: from mail-px0-f202.google.com ([209.85.216.202]:52565 "EHLO mail-px0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751593AbZFTPc6 convert rfc822-to-8bit (ORCPT ); Sat, 20 Jun 2009 11:32:58 -0400 In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Sorry My mistake. I will take care of it now onwards regards Ravish On Sat, Jun 20, 2009 at 8:26 PM, Alan Stern = 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 comp= lete the >> disk write opertaion as sys_write to queue_command invokation veries= alot. > > Of course it varies. =A0The kernel buffers disk writes, shuffles them > around, and then carries them out when it wants to. =A0As James has > pointed out, your write(2) system calls don't directly cause any I/O = to > take place. > > Alan Stern > > > -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html