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From: Christoph Hellwig <hch@infradead.org>
To: David Disseldorp <ddiss@suse.de>
Cc: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org,
	martin.petersen@oracle.com, bvanassche@acm.org
Subject: Re: [RFC PATCH 5/5] scsi: target: avoid XCOPY per-loop read/write cmd allocations
Date: Tue, 24 Mar 2020 02:23:23 -0700	[thread overview]
Message-ID: <20200324092323.GE18399@infradead.org> (raw)
In-Reply-To: <20200323165410.24423-6-ddiss@suse.de>

On Mon, Mar 23, 2020 at 05:54:10PM +0100, David Disseldorp wrote:
> Reads and writes in the XCOPY loop are synchronous, so needn't be
> allocated / freed with each loop.

That is true, but I think with your previous cleanups we can easily
go one step further and just allocate a single command and sense buffer
directly in struct xcopy_op, and just have local completions on the
stack.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: David Disseldorp <ddiss@suse.de>
Cc: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org,
	martin.petersen@oracle.com, bvanassche@acm.org
Subject: Re: [RFC PATCH 5/5] scsi: target: avoid XCOPY per-loop read/write cmd allocations
Date: Tue, 24 Mar 2020 09:23:23 +0000	[thread overview]
Message-ID: <20200324092323.GE18399@infradead.org> (raw)
In-Reply-To: <20200323165410.24423-6-ddiss@suse.de>

On Mon, Mar 23, 2020 at 05:54:10PM +0100, David Disseldorp wrote:
> Reads and writes in the XCOPY loop are synchronous, so needn't be
> allocated / freed with each loop.

That is true, but I think with your previous cleanups we can easily
go one step further and just allocate a single command and sense buffer
directly in struct xcopy_op, and just have local completions on the
stack.

  reply	other threads:[~2020-03-24  9:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 16:54 [RFC PATCH 0/5] scsi: target: XCOPY performance David Disseldorp
2020-03-23 16:54 ` David Disseldorp
2020-03-23 16:54 ` [RFC PATCH 1/5] scsi: target: use #def for xcopy descriptor len David Disseldorp
2020-03-23 16:54   ` David Disseldorp
2020-03-24  9:06   ` Christoph Hellwig
2020-03-24  9:06     ` Christoph Hellwig
2020-03-23 16:54 ` [RFC PATCH 2/5] scsi: target: drop xcopy DISK BLOCK LENGTH debug David Disseldorp
2020-03-23 16:54   ` David Disseldorp
2020-03-24  9:07   ` Christoph Hellwig
2020-03-24  9:07     ` Christoph Hellwig
2020-03-23 16:54 ` [RFC PATCH 3/5] scsi: target: avoid per-loop XCOPY buffer allocations David Disseldorp
2020-03-23 16:54   ` David Disseldorp
2020-03-24  9:16   ` Christoph Hellwig
2020-03-24  9:16     ` Christoph Hellwig
2020-03-23 16:54 ` [RFC PATCH 4/5] scsi: target: increase XCOPY I/O size David Disseldorp
2020-03-23 16:54   ` David Disseldorp
2020-03-24  9:16   ` Christoph Hellwig
2020-03-24  9:16     ` Christoph Hellwig
2020-03-23 16:54 ` [RFC PATCH 5/5] scsi: target: avoid XCOPY per-loop read/write cmd allocations David Disseldorp
2020-03-23 16:54   ` David Disseldorp
2020-03-24  9:23   ` Christoph Hellwig [this message]
2020-03-24  9:23     ` Christoph Hellwig
2020-03-26 21:20     ` David Disseldorp
2020-03-26 21:20       ` David Disseldorp

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