linux-kernel - Re: [PATCH v2] cfq: queued/in

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Message-ID: <CA+X1aCTPh0jORkk=xrOmQLiGokTTEW0y1Du0uXmqWQUa=W84Fw@mail.gmail.com>
Date:	Mon, 5 Sep 2011 12:37:04 +0400
From:	Maxim Patlasov <maxim.patlasov@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cfq: queued/in_driver stats

Jens,

>> The patch implements gathering and exporting statistics for cfqd->rq_queued
>> and cfqd->rq_in_driver. Average values of queued/in_driver are visible via
>> ...
> Seems like an awful lot of code for something that could be gleaned
> with blktrace?

I agree, from the view of keeping code simple, it's simpler to extend
existing blktrace logging like this:

-	cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
-		     cfqd->rq_in_driver);
+	cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d queued=%d",
+		     cfqd->rq_in_driver, cfqd->rq_queued);

and to print cfqd->hw_tag somewhere.

Thanks,
Maxim
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