From: Andi Kleen <andi@firstfloor.org>
To: Jeff Garzik <jeff@garzik.org>
Cc: Andi Kleen <andi@firstfloor.org>,
Stefan Richter <stefanr@s5r6.in-berlin.de>,
Boaz Harrosh <bharrosh@panasas.com>,
James.Bottomley@suse.de, nab@linux-iscsi.org,
linux-scsi@vger.kernel.org,
Linux IDE mailing list <linux-ide@vger.kernel.org>
Subject: Re: Full hostlock pushdown available
Date: Tue, 2 Nov 2010 10:21:11 +0100 [thread overview]
Message-ID: <20101102092111.GK25817@basil.fritz.box> (raw)
In-Reply-To: <4CCF0DFE.4050106@garzik.org>
> It's a bit disappointing that libata's lock profile in this patch is
> quite different than that of current upstream: with your patch,
> libata holds the scsi host lock for a considerably longer period of
> time, while also holding the ATA port/host spinlock.
The goal here is not really what comes out of this patch,
but dropping the host lock completely. This is just the first step.
>
> IOW, it's doing the exact opposite of what the previous code did
> (release the scsi host lock, before acquiring the ATA port/host
> spinlock), not at all an equivalent transformation.
>
> The following sequence would seem to better preserve the existing
> lock profile, correct?
Possibly, but it's not a mechanic change.
-Andi
next prev parent reply other threads:[~2010-11-02 9:21 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-28 15:05 Full hostlock pushdown available Andi Kleen
2010-10-28 19:28 ` James Bottomley
2010-10-28 19:32 ` Nicholas A. Bellinger
2010-11-01 14:06 ` Andi Kleen
2010-11-01 14:29 ` James Bottomley
2010-10-28 20:10 ` Andi Kleen
2010-10-28 20:22 ` James Bottomley
2010-10-28 21:50 ` Andi Kleen
2010-10-28 22:37 ` Nicholas A. Bellinger
2010-10-31 12:22 ` Boaz Harrosh
2010-10-31 18:48 ` Stefan Richter
2010-11-01 2:34 ` Jeff Garzik
2010-11-01 13:53 ` Andi Kleen
2010-11-01 15:56 ` Jeff Garzik
2010-11-01 17:57 ` Andi Kleen
2010-11-01 18:42 ` Jeff Garzik
2010-11-02 15:05 ` Andi Kleen
2010-11-01 18:59 ` Jeff Garzik
2010-11-01 21:06 ` Nicholas A. Bellinger
2010-11-02 9:21 ` Andi Kleen [this message]
2010-11-02 15:59 ` Jeff Garzik
2010-11-02 17:53 ` Andi Kleen
2010-11-02 18:13 ` Jeff Garzik
2010-11-02 18:38 ` Nicholas A. Bellinger
2010-11-02 18:50 ` Jeff Garzik
2010-11-01 13:54 ` Andi Kleen
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