linux-kernel - Re: [PATCH 1/3] sched: define a function to report the number of context switches on a CPU

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Message-ID: <20190820093827.GF2332@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Aug 2019 11:38:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     longli@...uxonhyperv.com
Cc:     Ingo Molnar <mingo@...hat.com>,
        Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Long Li <longli@...rosoft.com>
Subject: Re: [PATCH 1/3] sched: define a function to report the number of
 context switches on a CPU

On Mon, Aug 19, 2019 at 11:14:27PM -0700, longli@...uxonhyperv.com wrote:
> From: Long Li <longli@...rosoft.com>
> 
> The number of context switches on a CPU is useful to determine how busy this
> CPU is on processing IRQs. Export this information so it can be used by device
> drivers.

Please do explain that; because I'm not seeing how number of switches
relates to processing IRQs _at_all_!