From: Qian Cai <cai@lca.pw>
To: paulmck@kernel.org
Cc: rcu@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: Boot warning at rcu_check_gp_start_stall()
Date: Tue, 21 Jan 2020 06:45:32 -0500 [thread overview]
Message-ID: <D7FEEB19-B519-4AC6-ABA4-250200E2A4E9@lca.pw> (raw)
In-Reply-To: <20200121050941.GO2935@paulmck-ThinkPad-P72>
> On Jan 21, 2020, at 12:09 AM, Paul E. McKenney <paulmck@kernel.org> wrote:
>
> This is what you get when a grace period has been requested, but does
> not start within 21 seconds or so. The "->state: 0x1ffff" is a new one
> on me -- that normally happens only before RCU's grace-period kthread
> has been spawned. But by 97 seconds after boot, it should definitely
> already be up and running.
>
> Is the system responsive at this point?
Yes, it works fine.
>
> Except... Why is it taking 96 seconds for the system to get to the point
> where it prints "Dentry cache hash table entries:"? That happens at 0.139
> seconds on my laptop. And at about the same time on a much larger system.
>
> I could easily imagine that all sorts of things would break when boot
> takes that long.
I suppose the kernel has CONFIG_EFI_PGT_DUMP=y, so it takes a while to run just before rcu_check_gp_start_stall().
next prev parent reply other threads:[~2020-01-21 11:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-21 4:25 Boot warning at rcu_check_gp_start_stall() Qian Cai
2020-01-21 5:09 ` Paul E. McKenney
2020-01-21 11:45 ` Qian Cai [this message]
2020-01-21 14:19 ` Paul E. McKenney
2020-01-21 14:37 ` Qian Cai
2020-01-21 16:15 ` Paul E. McKenney
2020-01-21 19:09 ` Qian Cai
2020-01-21 20:46 ` Paul E. McKenney
2020-01-22 4:16 ` Qian Cai
2020-01-22 5:07 ` Paul E. McKenney
2020-01-22 5:20 ` Qian Cai
2020-01-22 16:50 ` Paul E. McKenney
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