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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: [07/13] powerpc/64s: idle avoid SRR usage in idle sleep/wake paths
Date: Mon, 19 Jun 2017 22:25:45 +1000 (AEST)	[thread overview]
Message-ID: <3wrqvG2sDSz9sBR@ozlabs.org> (raw)
In-Reply-To: <20170613130557.26315-8-npiggin@gmail.com>

On Tue, 2017-06-13 at 13:05:51 UTC, Nicholas Piggin wrote:
> Idle code now always runs at the 0xc... effective address whether
> in real or virtual mode. This means rfid can be ditched, along
> with a lot of SRR manipulations.
> 
> In the wakeup path, carry SRR1 around in r12. Use mtmsrd to change
> MSR states as required.
> 
> This also balances the return prediction for the idle call, by
> doing blr rather than rfid to return to the idle caller.
> 
> On POWER9, 2-process context switch on different cores, with snooze
> disabled, increases performance by 2%.

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/9d29250136f60438fc0839871bae0a

cheers

  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   ` [03/13] " Michael Ellerman
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   ` Michael Ellerman [this message]
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

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