From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
To: Anton Blanchard <anton@ozlabs.org>
Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
ego@linux.vnet.ibm.com, rjw@rjwysocki.net,
daniel.lezcano@linaro.org, npiggin@gmail.com,
linuxppc-dev@lists.ozlabs.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH 2/3] cpuidle: powernv: Don't continually set thread priority in snooze_loop()
Date: Tue, 4 Apr 2017 09:36:22 +0530 [thread overview]
Message-ID: <20170404040622.GC21029@drishya.in.ibm.com> (raw)
In-Reply-To: <20170403215414.16951-2-anton@ozlabs.org>
* Anton Blanchard <anton@ozlabs.org> [2017-04-04 07:54:13]:
> From: Anton Blanchard <anton@samba.org>
>
> The powerpc64 kernel exception handlers have preserved thread priorities
> for a long time now, so there is no need to continually set it.
>
> Just set it once on entry and once exit.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
> ---
> drivers/cpuidle/cpuidle-powernv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
> index 9d9f164894eb..8c991c254b95 100644
> --- a/drivers/cpuidle/cpuidle-powernv.c
> +++ b/drivers/cpuidle/cpuidle-powernv.c
> @@ -56,8 +56,8 @@ static int snooze_loop(struct cpuidle_device *dev,
>
> snooze_exit_time = get_tb() + snooze_timeout;
> ppc64_runlatch_off();
> + HMT_very_low();
> while (!need_resched()) {
> - HMT_very_low();
> if (snooze_timeout_en && get_tb() > snooze_exit_time)
> break;
> }
> --
> 2.11.0
>
next prev parent reply other threads:[~2017-04-04 4:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-03 21:54 [PATCH 1/3] cpuidle: powernv: Don't bounce between low and very low thread priority Anton Blanchard
2017-04-03 21:54 ` [PATCH 2/3] cpuidle: powernv: Don't continually set thread priority in snooze_loop() Anton Blanchard
2017-04-04 4:06 ` Vaidyanathan Srinivasan [this message]
2017-04-03 21:54 ` [PATCH 3/3] cpuidle: powernv: Avoid a branch in the core snooze_loop() loop Anton Blanchard
2017-04-03 23:54 ` Nicholas Piggin
2017-04-04 4:10 ` Vaidyanathan Srinivasan
2017-04-03 23:52 ` [PATCH 1/3] cpuidle: powernv: Don't bounce between low and very low thread priority Nicholas Piggin
2017-04-04 4:13 ` Vaidyanathan Srinivasan
2017-04-04 4:04 ` Vaidyanathan Srinivasan
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