linux-kernel - Re: [RFD PATCH 01/10] sched: add io latency framework

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Message-ID: <CAJvTdKkF1Z9eUwjv4-idzCUTzD_MdEeZWOxkB+VmGoEcnJfk-A@mail.gmail.com>
Date:	Mon, 27 Oct 2014 23:19:49 -0400
From:	Len Brown <lenb@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	axboe@...nel.dk, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	preeti@...ux.vnet.ibm.com,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	mturquette@...aro.org,
	Tuukka Tikkanen <tuukka.tikkanen@...aro.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [RFD PATCH 01/10] sched: add io latency framework

> There is a rb tree per cpu. Each time a task is blocked on an IO, it
> is inserted into the tree. When the IO is complete and the task is
> woken up, its avg latency is updated with the time spent to wait the
> IO and it is removed from the tree. The next time, it will be inserted
> into the tree again in case of io_schedule.

Is there an assumption built-in here that the device interrupt is targeted
at the same CPU as where the task is queued?

thanks,
Len Brown, Intel Open Source Technology Center
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