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Re: [PATCH 01/17] Add ida and idr helper routines.

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Hello,

On Tue, Sep 15, 2015 at 11:38:42AM -0700, James Bottomley wrote:
> For most of the SCSI stuff, yes.  I'm less sure about the sd numbers.
> They go up very high and get hammered a lot during system bring up and
> hot plug.  I think having their own lock rather than wrapping everything
> around simple_ida_lock makes more sense here just because the system is
> heavily contended on getting indexes at bring up.
> 
> To continue the thought, why not move simple_ida_lock into struct ida so
> we don't have to worry about the contention and can sue ida_simple_...
> everywhere?

We sure can do that if necessary but I'm rather doubtful that even
with sd number hammering this is likely to be a problem.  Let's
convert the users to the simple interface and make the lock per-ida if
we actually see contention on the lock.

Thanks.

-- 
tejun
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[PATCH 00/17] Create and use ida and idr helper routines Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 04/17] Update the ch driver to use idr helper functions. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 11/17] Update the rtsx multifunction driver to use idr helper functions. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 12/17] Update the TI Flash Media driver to use idr helper functions. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 02/17] Update scsi hosts to use idr for host number mgmt Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 01/17] Add ida and idr helper routines. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
    Re: [PATCH 01/17] Add ida and idr helper routines. James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-09-15 20:30 +0200
    Re: [PATCH 01/17] Add ida and idr helper routines. Tejun Heo <tj@kernel.org> - 2015-09-15 20:30 +0200
      Re: [PATCH 01/17] Add ida and idr helper routines. James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-09-15 20:40 +0200
        Re: [PATCH 01/17] Add ida and idr helper routines. Tejun Heo <tj@kernel.org> - 2015-09-15 20:50 +0200
          Re: [PATCH 01/17] Add ida and idr helper routines. Tejun Heo <tj@kernel.org> - 2015-09-18 17:50 +0200
          Re: [PATCH 01/17] Add ida and idr helper routines. Lee Duncan <lduncan@suse.com> - 2015-09-18 17:50 +0200
  [PATCH 03/17] Update the st driver to use idr helper functions. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200
  [PATCH 10/17] Update the DCA DMA driver to use idr helper functions. Lee Duncan <lduncan@suse.com> - 2015-09-15 19:00 +0200

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