From: Tao Ma <tm@tao.ma>
To: linux-btrace@vger.kernel.org
Subject: Re: blktrace on my block device
Date: Thu, 07 Jul 2011 09:53:05 +0000 [thread overview]
Message-ID: <4E158201.3020907@tao.ma> (raw)
On 07/07/2011 05:41 PM, Gangadhar Mylapuram wrote:
> Hi,
>
> As for my understanding I no need to handle (BLKRESTART, BLKTRACESTOP,
> BLKTRACESETUP ..) in my device ioctl handling. It is block l/O layer
> which intercepts the
> statistics and does the job.
>
> But for my device (not sda or hda), blktrace only show the Q events.
> It is not showing even C (completed) events. Do I need to add the
> support in my device ioctl handling code?
These trace pointers are only recorded if they are met.
So I guess the reason is that your device implements your own
make_request_fn(So you can see 'Q' event) and no other trace point is
met at all.
Thanks,
Tao
next reply other threads:[~2011-07-07 9:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-07 9:53 Tao Ma [this message]
2011-07-07 9:53 ` blktrace on my block device Gangadhar Mylapuram
2011-07-07 12:57 ` Gangadhar Mylapuram
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