linux-kernel - RE: [PATCH RESEND v3 5/6] AHCI: Optimize single IRQ interrupt processing

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Message-ID: <94D0CD8314A33A4D9D801C0FE68B402958C9C5C7@G9W0745.americas.hpqcorp.net>
Date:	Thu, 25 Sep 2014 03:00:58 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Tejun Heo <tj@...nel.org>, Alexander Gordeev <agordeev@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: RE: [PATCH RESEND v3 5/6] AHCI: Optimize single IRQ interrupt
 processing

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Tejun Heo
...
> The thing I don't get is why multiple MSI handling and this patchset
> are tied to threaded interrupt handling.  Splitting locks don't
> necessarily have much to do with threaded handling and it's not like
> ahci interrupt handling is heavy.  The hot path is pretty short
> actually.  The meat of the work - completing requests and propagating
> completions - is offloaded to softirq by block layer anyway.

blk-mq/scsi-mq chose to move all completion work into hardirq context,
so this seems headed in a different direction.


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