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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Linux-OMAP <linux-omap@vger.kernel.org>
Subject: Re: Slow booting on x15
Date: Fri, 18 Sep 2020 18:58:44 +0300	[thread overview]
Message-ID: <20200918155844.GH28436@pendragon.ideasonboard.com> (raw)
In-Reply-To: <ea02f57e-871d-cd16-4418-c1da4bbc4696@ti.com>

On Fri, Sep 18, 2020 at 06:25:02PM +0300, Tomi Valkeinen wrote:
> Hi,
> 
> Has anyone noticed that booting would have slowed down in 5.8 and in 5.9-rcs? I'm booting x15 with
> my custom config builder, which uses omap2plus_defconfig as a base. I see:
> 
> v5.7
> [    0.597765] cpuidle: using governor menu
> [    0.793198] No ATAGs?
> 
> [    9.654611] Run /sbin/init as init process
> 
> 5.8
> [    0.616660] cpuidle: using governor menu
> [    4.439856] No ATAGs?
> 
> [   15.484710] Run /sbin/init as init process
> 
> v5.9-rc5
> [    0.706165] cpuidle: using governor menu
> [    6.761812] No ATAGs?
> 
> [   19.522536] Run /sbin/init as init process
> 
> 
> So v5.7 boots quickly, and init starts around 9.6 secs. 5.8 is much slower, and 5.9-rc5 even slower.

I've tracked this down to device_link_add_missing_supplier_links()
taking about 40+ms to run, for every device added to the system. Given
the large number of devices, this adds up to 10s on v5.9-rc5, when
called during the initial of_platform_populate().

It doesn't seem there's a single culprit here (although I may have
missed it), "just" lots of walks through the whole device tree that end
up taking way too much time. I'm not planning to investigate this
further at this point.

> My config builder enables all kinds of debug options, so possibly it could be just more debug
> features or such having been implemented, or enabled in omap2plus_defconfig...

-- 
Regards,

Laurent Pinchart

  reply	other threads:[~2020-09-18 15:59 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 15:25 Slow booting on x15 Tomi Valkeinen
2020-09-18 15:58 ` Laurent Pinchart [this message]
2020-09-23  7:07   ` Tony Lindgren
2020-09-23 11:13     ` Laurent Pinchart
2020-09-24  5:42       ` Tony Lindgren
2020-09-24  5:53         ` Tony Lindgren
2020-09-24  6:04           ` Tomi Valkeinen
2020-09-24  6:08             ` Tony Lindgren
2020-09-24 13:30               ` Laurent Pinchart
2020-09-25 11:51                 ` Tony Lindgren
2020-09-25 11:58                   ` Laurent Pinchart
2020-09-30  5:20                     ` Tony Lindgren
2020-09-30 12:41                       ` Peter Ujfalusi
2020-10-01  7:53                         ` Tony Lindgren
2020-10-01  8:17                           ` Tony Lindgren
2020-10-01  8:22                             ` Laurent Pinchart
2020-10-01 12:56                               ` Grygorii Strashko
2020-10-01 13:11                                 ` Geert Uytterhoeven
2020-10-01 13:49                                   ` Grygorii Strashko
2020-10-01 18:24                                 ` Saravana Kannan
2020-10-01 19:43                                   ` Grygorii Strashko
2020-10-01 22:22                                     ` Saravana Kannan
2020-10-01 22:30                                       ` Saravana Kannan
2020-10-01 22:38                                         ` Laurent Pinchart
2020-10-01 22:44                                           ` Saravana Kannan
2020-10-01 22:59                                             ` [PATCH v1] of: platform: Batch fwnode parsing in the init_machine() path Saravana Kannan
2020-10-01 23:19                                               ` Laurent Pinchart
2020-10-02 11:40                                                 ` Grygorii Strashko
2020-10-02 15:03                                                   ` Grygorii Strashko
2020-10-02 17:48                                                     ` Saravana Kannan
2020-10-02 18:11                                                       ` Grygorii Strashko
2020-10-02 14:07                                               ` Rob Herring
2020-10-02 17:51                                                 ` Saravana Kannan
2020-10-02 17:54                                                   ` Laurent Pinchart
2020-10-02 17:58                                                     ` Saravana Kannan
2020-10-02 18:27                                                       ` Laurent Pinchart
2020-10-02 18:35                                                         ` Grygorii Strashko
2020-10-02 19:56                                                           ` Saravana Kannan
2020-10-03  0:13                                                             ` Laurent Pinchart
2020-10-27  3:29                                                               ` Saravana Kannan
2020-10-28  7:34                                                                 ` Tomi Valkeinen
2020-10-02 20:29                                                   ` Rob Herring

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