From: David Abdurachmanov <david.abdurachmanov@gmail.com>
To: Andreas Schwab <schwab@suse.de>
Cc: Yash Shah <yash.shah@sifive.com>,
devicetree@vger.kernel.org, Albert Ou <aou@eecs.berkeley.edu>,
Atish Patra <atish.patra@wdc.com>,
Anup Patel <anup@brainfault.org>,
lollivier@baylibre.com,
"linux-kernel@vger.kernel.org List"
<linux-kernel@vger.kernel.org>,
green.wan@sifive.com, Sachin Ghadi <sachin.ghadi@sifive.com>,
robh+dt@kernel.org, Palmer Dabbelt <palmer@dabbelt.com>,
deepa.kernel@gmail.com, Paul Walmsley <paul.walmsley@sifive.com>,
Alistair Francis <alistair.francis@wdc.com>,
linux-riscv <linux-riscv@lists.infradead.org>,
Bin Meng <bmeng.cn@gmail.com>
Subject: Re: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive
Date: Wed, 1 Jul 2020 15:04:19 +0300 [thread overview]
Message-ID: <CAEn-LTqMAf8vaaMhkX7h7+iY8U8v6JTSpW1FMj+JDr7PaWx1zw@mail.gmail.com> (raw)
In-Reply-To: <mvmftabiklh.fsf@suse.de>
On Wed, Jul 1, 2020 at 1:41 PM Andreas Schwab <schwab@suse.de> wrote:
>
> On Jun 16 2020, Yash Shah wrote:
>
> > The patch series adds the support for dynamic CPU frequency switching
> > for FU540-C000 SoC on the HiFive Unleashed board. All the patches are
> > based on Paul Walmsley's work.
> >
> > This series is based on Linux v5.7 and tested on HiFive unleashed board.
>
> I'm using that patch with 5.7.5.
>
> It appears to interfer with serial output when using the ondemand
> governor.
I do recall that userspace governor is the only one supported but this
might have changed before this patch was posted.
Yash, do you have more details?
>
> I also see soft lockups when using the performance governor:
>
> [ 101.587527] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 101.592322] rcu: 0-...!: (932 ticks this GP) idle=11a/1/0x4000000000000004 softirq=4301/4301 fqs=4
> [ 101.601432] (t=6001 jiffies g=4017 q=859)
> [ 101.605514] rcu: rcu_sched kthread starved for 5984 jiffies! g4017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=2
> [ 101.615494] rcu: RCU grace-period kthread stack dump:
> [ 101.620530] rcu_sched R running task 0 10 2 0x00000000
> [ 101.627560] Call Trace:
> [ 101.630004] [<ffffffe00085a7e2>] __schedule+0x25c/0x616
> [ 101.635205] [<ffffffe00085abde>] schedule+0x42/0xb2
> [ 101.640070] [<ffffffe00085d0ba>] schedule_timeout+0x56/0xb8
> [ 101.645626] [<ffffffe000263c34>] rcu_gp_fqs_loop+0x208/0x248
> [ 101.651266] [<ffffffe0002666de>] rcu_gp_kthread+0xc2/0xcc
> [ 101.656651] [<ffffffe00022654e>] kthread+0xda/0xec
> [ 101.661426] [<ffffffe00020140a>] ret_from_exception+0x0/0xc
> [ 101.666977] Task dump for CPU 0:
> [ 101.670187] loop0 R running task 0 655 2 0x00000008
> [ 101.677218] Call Trace:
> [ 101.679657] [<ffffffe0002028ae>] walk_stackframe+0x0/0xaa
> [ 101.685036] [<ffffffe000202b76>] show_stack+0x2a/0x34
> [ 101.690074] [<ffffffe0002319b0>] sched_show_task.part.0+0xc2/0xd2
> [ 101.696154] [<ffffffe00022bb9c>] sched_show_task+0x64/0x66
> [ 101.701618] [<ffffffe000231afe>] dump_cpu_task+0x3e/0x48
> [ 101.706916] [<ffffffe000267762>] rcu_dump_cpu_stacks+0x94/0xce
> [ 101.712731] [<ffffffe0002631f6>] print_cpu_stall+0x116/0x18a
> [ 101.718375] [<ffffffe000264a46>] check_cpu_stall+0xcc/0x1a2
> [ 101.723929] [<ffffffe000264b52>] rcu_pending.constprop.0+0x36/0xaa
> [ 101.730094] [<ffffffe000266ab2>] rcu_sched_clock_irq+0xa6/0xea
> [ 101.735913] [<ffffffe00026d1be>] update_process_times+0x1e/0x42
> [ 101.741821] [<ffffffe0002793bc>] tick_sched_handle+0x26/0x52
> [ 101.747456] [<ffffffe0002798fe>] tick_sched_timer+0x6a/0xd0
> [ 101.753015] [<ffffffe00026d9be>] __run_hrtimer.constprop.0+0x50/0xe8
> [ 101.759353] [<ffffffe00026da9e>] __hrtimer_run_queues+0x48/0x6c
> [ 101.765254] [<ffffffe00026e410>] hrtimer_interrupt+0xca/0x1d4
> [ 101.770985] [<ffffffe0006ceef8>] riscv_timer_interrupt+0x32/0x3a
> [ 101.776976] [<ffffffe00085e17c>] do_IRQ+0xa4/0xb8
> [ 101.781663] [<ffffffe00020140a>] ret_from_exception+0x0/0xc
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: David Abdurachmanov <david.abdurachmanov@gmail.com>
To: Andreas Schwab <schwab@suse.de>
Cc: devicetree@vger.kernel.org, Albert Ou <aou@eecs.berkeley.edu>,
Sachin Ghadi <sachin.ghadi@sifive.com>,
Anup Patel <anup@brainfault.org>,
lollivier@baylibre.com,
"linux-kernel@vger.kernel.org List"
<linux-kernel@vger.kernel.org>,
green.wan@sifive.com, Atish Patra <atish.patra@wdc.com>,
Yash Shah <yash.shah@sifive.com>,
robh+dt@kernel.org, Palmer Dabbelt <palmer@dabbelt.com>,
deepa.kernel@gmail.com, Paul Walmsley <paul.walmsley@sifive.com>,
Alistair Francis <alistair.francis@wdc.com>,
linux-riscv <linux-riscv@lists.infradead.org>,
Bin Meng <bmeng.cn@gmail.com>
Subject: Re: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive
Date: Wed, 1 Jul 2020 15:04:19 +0300 [thread overview]
Message-ID: <CAEn-LTqMAf8vaaMhkX7h7+iY8U8v6JTSpW1FMj+JDr7PaWx1zw@mail.gmail.com> (raw)
In-Reply-To: <mvmftabiklh.fsf@suse.de>
On Wed, Jul 1, 2020 at 1:41 PM Andreas Schwab <schwab@suse.de> wrote:
>
> On Jun 16 2020, Yash Shah wrote:
>
> > The patch series adds the support for dynamic CPU frequency switching
> > for FU540-C000 SoC on the HiFive Unleashed board. All the patches are
> > based on Paul Walmsley's work.
> >
> > This series is based on Linux v5.7 and tested on HiFive unleashed board.
>
> I'm using that patch with 5.7.5.
>
> It appears to interfer with serial output when using the ondemand
> governor.
I do recall that userspace governor is the only one supported but this
might have changed before this patch was posted.
Yash, do you have more details?
>
> I also see soft lockups when using the performance governor:
>
> [ 101.587527] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 101.592322] rcu: 0-...!: (932 ticks this GP) idle=11a/1/0x4000000000000004 softirq=4301/4301 fqs=4
> [ 101.601432] (t=6001 jiffies g=4017 q=859)
> [ 101.605514] rcu: rcu_sched kthread starved for 5984 jiffies! g4017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=2
> [ 101.615494] rcu: RCU grace-period kthread stack dump:
> [ 101.620530] rcu_sched R running task 0 10 2 0x00000000
> [ 101.627560] Call Trace:
> [ 101.630004] [<ffffffe00085a7e2>] __schedule+0x25c/0x616
> [ 101.635205] [<ffffffe00085abde>] schedule+0x42/0xb2
> [ 101.640070] [<ffffffe00085d0ba>] schedule_timeout+0x56/0xb8
> [ 101.645626] [<ffffffe000263c34>] rcu_gp_fqs_loop+0x208/0x248
> [ 101.651266] [<ffffffe0002666de>] rcu_gp_kthread+0xc2/0xcc
> [ 101.656651] [<ffffffe00022654e>] kthread+0xda/0xec
> [ 101.661426] [<ffffffe00020140a>] ret_from_exception+0x0/0xc
> [ 101.666977] Task dump for CPU 0:
> [ 101.670187] loop0 R running task 0 655 2 0x00000008
> [ 101.677218] Call Trace:
> [ 101.679657] [<ffffffe0002028ae>] walk_stackframe+0x0/0xaa
> [ 101.685036] [<ffffffe000202b76>] show_stack+0x2a/0x34
> [ 101.690074] [<ffffffe0002319b0>] sched_show_task.part.0+0xc2/0xd2
> [ 101.696154] [<ffffffe00022bb9c>] sched_show_task+0x64/0x66
> [ 101.701618] [<ffffffe000231afe>] dump_cpu_task+0x3e/0x48
> [ 101.706916] [<ffffffe000267762>] rcu_dump_cpu_stacks+0x94/0xce
> [ 101.712731] [<ffffffe0002631f6>] print_cpu_stall+0x116/0x18a
> [ 101.718375] [<ffffffe000264a46>] check_cpu_stall+0xcc/0x1a2
> [ 101.723929] [<ffffffe000264b52>] rcu_pending.constprop.0+0x36/0xaa
> [ 101.730094] [<ffffffe000266ab2>] rcu_sched_clock_irq+0xa6/0xea
> [ 101.735913] [<ffffffe00026d1be>] update_process_times+0x1e/0x42
> [ 101.741821] [<ffffffe0002793bc>] tick_sched_handle+0x26/0x52
> [ 101.747456] [<ffffffe0002798fe>] tick_sched_timer+0x6a/0xd0
> [ 101.753015] [<ffffffe00026d9be>] __run_hrtimer.constprop.0+0x50/0xe8
> [ 101.759353] [<ffffffe00026da9e>] __hrtimer_run_queues+0x48/0x6c
> [ 101.765254] [<ffffffe00026e410>] hrtimer_interrupt+0xca/0x1d4
> [ 101.770985] [<ffffffe0006ceef8>] riscv_timer_interrupt+0x32/0x3a
> [ 101.776976] [<ffffffe00085e17c>] do_IRQ+0xa4/0xb8
> [ 101.781663] [<ffffffe00020140a>] ret_from_exception+0x0/0xc
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2020-07-01 12:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 12:01 [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Yash Shah
2020-06-16 12:01 ` Yash Shah
2020-06-16 12:01 ` [PATCH 1/3] riscv: defconfig, Kconfig: enable CPU power management Yash Shah
2020-06-16 12:01 ` Yash Shah
2020-06-16 12:01 ` [PATCH 2/3] riscv: dts: fu540-c000: define hart clocks Yash Shah
2020-06-16 12:01 ` Yash Shah
2021-06-16 3:16 ` Bin Meng
2021-06-16 3:16 ` Bin Meng
2021-06-16 15:13 ` David Abdurachmanov
2021-06-16 15:13 ` David Abdurachmanov
2021-06-16 22:56 ` Bin Meng
2021-06-16 22:56 ` Bin Meng
2020-06-16 12:01 ` [PATCH 3/3] riscv: dts: HiFive Unleashed: define a default set of CPU OPPs Yash Shah
2020-06-16 12:01 ` Yash Shah
2020-06-29 9:30 ` [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Greentime Hu
2020-06-29 9:30 ` Greentime Hu
2020-07-01 10:40 ` Andreas Schwab
2020-07-01 10:40 ` Andreas Schwab
2020-07-01 12:04 ` David Abdurachmanov [this message]
2020-07-01 12:04 ` David Abdurachmanov
2020-07-03 5:53 ` Yash Shah
2020-07-03 5:53 ` Yash Shah
2020-07-06 8:15 ` Andreas Schwab
2020-07-06 8:15 ` Andreas Schwab
2020-07-09 20:48 ` Palmer Dabbelt
2020-07-09 20:48 ` Palmer Dabbelt
2020-07-08 12:06 ` Yash Shah
2020-07-08 12:06 ` Yash Shah
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAEn-LTqMAf8vaaMhkX7h7+iY8U8v6JTSpW1FMj+JDr7PaWx1zw@mail.gmail.com \
--to=david.abdurachmanov@gmail.com \
--cc=alistair.francis@wdc.com \
--cc=anup@brainfault.org \
--cc=aou@eecs.berkeley.edu \
--cc=atish.patra@wdc.com \
--cc=bmeng.cn@gmail.com \
--cc=deepa.kernel@gmail.com \
--cc=devicetree@vger.kernel.org \
--cc=green.wan@sifive.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=lollivier@baylibre.com \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=robh+dt@kernel.org \
--cc=sachin.ghadi@sifive.com \
--cc=schwab@suse.de \
--cc=yash.shah@sifive.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.