From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 5 Sep 2019 11:55:19 -0500
From: David Teigland <teigland@redhat.com>
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Subject: Re: [linux-lvm] system boot time regression when using lvm2-2.03.05
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To: Heming Zhao <heming.zhao@suse.com>
Cc: Martin Wilck <mwilck@suse.de>, "linux-lvm@redhat.com" <linux-lvm@redhat.com>

On Thu, Sep 05, 2019 at 12:35:53PM +0000, Heming Zhao wrote:
> In pvscan_cache_cmd, the code in below area "#if 0 .. #endif take a huge 
> time. When I used below modified code to boot, the time reduced from 
> 1min to 1.389s.

That stops the command from doing any work.  I suspect that in your tests,
the "fast" case is not doing any activation, and the "slow" case is.
Please check where the LVs are being activated in the fast case.