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Re: [dm-devel] [PATCH 12/13] Make generic_make_request handle arbitrarily large bios

From: Alasdair G Kergon <agk redhat com>
To: Tejun Heo <tj kernel org>
Cc: axboe kernel dk, koverstreet google com, dm-devel redhat com, linux-kernel vger kernel org, linux-bcache vger kernel org, linux-fsdevel vger kernel org, agk redhat com
Subject: Re: [dm-devel] [PATCH 12/13] Make generic_make_request handle arbitrarily large bios
Date: Sat, 19 May 2012 01:59:32 +0100

On Fri, May 18, 2012 at 10:52:16AM -0700, Tejun Heo wrote:
> Does this by any chance allow killing ->merge_bvec_fn()?

merge_bvec also has an impact on efficiency.

Why create a too-large bio in the first place if it's only going to have to
get split up again?

If a change like this goes in, the various trade-offs should be re-examined.

Alasdair

References:
- [dm-devel] [PATCH 00/13] Block cleanups (for bcache)
  - From: koverstreet
- [dm-devel] [PATCH 12/13] Make generic_make_request handle arbitrarily large bios
  - From: koverstreet
- Re: [dm-devel] [PATCH 12/13] Make generic_make_request handle arbitrarily large bios
  - From: Tejun Heo

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