Date: Wed, 11 Nov 2015 03:28:46 -0800
From: Christoph Hellwig <hch@infradead.org>
To: Mike Christie <michaelc@cs.wisc.edu>
Cc: device-mapper development <dm-devel@redhat.com>,
        linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Bart Van Assche <bart.vanassche@sandisk.com>,
        drbd-dev@lists.linbit.com
Subject: Re: [dm-devel] [RFC PATCH 00/32] separate operations from flags in
 the bio/request structs
Message-ID: <20151111112846.GA358@infradead.org>
References: <1446654807-6935-1-git-send-email-mchristi@redhat.com>
 <563A36FC.6010001@sandisk.com>
 <563A3813.5010604@cs.wisc.edu>
 <20151107102309.GE12117@infradead.org>
 <5642F3F4.2060007@cs.wisc.edu>
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On Wed, Nov 11, 2015 at 01:53:24AM -0600, Mike Christie wrote:
> We no longer have the bvec merge functions so the original reason given
> in the thread/patch Bart referenced is no longer valid.
> 
> Offlist it was suggested that dropping the argument from submit_bio
> might still improve performance, but I modified xfs and dm and did some
> testing and did not see anything.
> 
> So the change is not needed, and it would only be done because people
> feel it would improve the interface.

I would defintively prefer the changed interface, and to me it also
looks like it would make your overall patch simpler.  If you disagree
feel free to keep it as-is for now and I'll do another pass later.
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