From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: "Gautham R . Shenoy" <ego@linux.vnet.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [03/13] powerpc/64s: idle process interrupts from system reset wakeup
Date: Mon, 19 Jun 2017 22:25:41 +1000 (AEST) [thread overview]
Message-ID: <3wrqv92rzZz9sBR@ozlabs.org> (raw)
In-Reply-To: <20170613130557.26315-4-npiggin@gmail.com>
On Tue, 2017-06-13 at 13:05:47 UTC, Nicholas Piggin wrote:
> When the CPU wakes from low power state, it begins at the system reset
> interrupt with the exception that caused the wakeup encoded in SRR1.
>
> Today, powernv idle wakeup ignores the wakeup reason (except a special
> case for HMI), and the regular interrupt corresponding to the
> exception will fire after the idle wakeup exits.
>
> Change this to replay the interrupt from the idle wakeup before
> interrupts are hard-enabled.
>
> Test on POWER8 of context_switch selftests benchmark with polling idle
> disabled (e.g., always nap, giving cross-CPU IPIs) gives the following
> results:
>
> original wakeup direct
> Different threads, same core: 315k/s 264k/s
> Different cores: 235k/s 242k/s
>
> There is a slowdown for doorbell IPI (same core) case because system
> reset wakeup does not clear the message and the doorbell interrupt
> fires again needlessly.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/771d4304d07f080b6ce751e12f3579
cheers
next prev parent reply other threads:[~2017-06-19 12:25 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-13 13:05 [PATCH 00/13 v3] idle performance improvements Nicholas Piggin
2017-06-13 13:05 ` [PATCH 01/13] powerpc/64s: idle move soft interrupt mask logic into C code Nicholas Piggin
2017-06-19 12:25 ` [01/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 02/13] powerpc/64s: idle hotplug lazy-irq simplification Nicholas Piggin
2017-06-19 12:25 ` [02/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 03/13] powerpc/64s: idle process interrupts from system reset wakeup Nicholas Piggin
2017-06-13 13:28 ` Nicholas Piggin
2017-06-14 11:29 ` Michael Ellerman
2017-06-19 12:25 ` Michael Ellerman [this message]
2017-06-13 13:05 ` [PATCH 04/13] powerpc/64s: msgclr when handling doorbell exceptions Nicholas Piggin
2017-06-19 12:25 ` [04/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 05/13] powerpc/64s: interrupt replay balance the return branch predictor Nicholas Piggin
2017-06-19 12:25 ` [05/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 06/13] powerpc/64s: idle branch to handler with virtual mode offset Nicholas Piggin
2017-06-19 12:25 ` [06/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 07/13] powerpc/64s: idle avoid SRR usage in idle sleep/wake paths Nicholas Piggin
2017-06-15 12:11 ` Nicholas Piggin
2017-06-19 12:25 ` [07/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 08/13] powerpc/64s: idle hmi wakeup is unlikely Nicholas Piggin
2017-06-19 12:25 ` [08/13] " Michael Ellerman
2017-06-13 13:05 ` [PATCH 09/13] powerpc/64s: cpuidle set polling before enabling irqs Nicholas Piggin
2017-06-14 11:40 ` Michael Ellerman
2017-06-14 11:50 ` Nicholas Piggin
2017-06-14 13:05 ` Michael Ellerman
2017-06-13 13:05 ` [PATCH 10/13] powerpc/64s: cpuidle read mostly for common globals Nicholas Piggin
2017-06-13 13:05 ` [PATCH 11/13] powerpc/64s: cpuidle no memory barrier after break from idle Nicholas Piggin
2017-06-13 13:05 ` [PATCH 12/13] powerpc/64: runlatch CTRL[RUN] set optimisation Nicholas Piggin
2017-06-14 11:38 ` Michael Ellerman
2017-06-14 13:44 ` Nicholas Piggin
2017-06-15 9:35 ` Michael Ellerman
2017-06-13 13:05 ` [PATCH 13/13] powerpc/64s: idle runlatch switch is done with MSR[EE]=0 Nicholas Piggin
2017-06-19 12:25 ` [13/13] " Michael Ellerman
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=3wrqv92rzZz9sBR@ozlabs.org \
--to=patch-notifications@ellerman.id.au \
--cc=ego@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=npiggin@gmail.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.