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Message-ID: <20200722055925.GC31038@in.ibm.com>
Date: Wed, 22 Jul 2020 11:29:25 +0530
From: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Michael Ellerman <michaele@....ibm.com>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
LKML <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Valentin Schneider <valentin.schneider@....com>,
Nick Piggin <npiggin@....ibm.com>,
Oliver OHalloran <oliveroh@....ibm.com>,
Nathan Lynch <nathanl@...ux.ibm.com>,
Michael Neuling <mikey@...ux.ibm.com>,
Anton Blanchard <anton@....ibm.com>,
Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>,
Jordan Niethe <jniethe5@...il.com>
Subject: Re: [PATCH v2 04/10] powerpc/smp: Enable small core scheduling sooner
Hello Srikar,
On Tue, Jul 21, 2020 at 05:08:08PM +0530, Srikar Dronamraju wrote:
> Enable small core scheduling as soon as we detect that we are in a
> system that supports thread group. Doing so would avoid a redundant
> check.
The patch looks good to me. However, I think the commit message still
reflect the v1 code where we were moving the functionality from
smp_cpus_done() to init_big_cores().
In this we are moving it to a helper function to collate all fixups to
topology.
>
> Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
> Cc: LKML <linux-kernel@...r.kernel.org>
> Cc: Michael Ellerman <michaele@....ibm.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Valentin Schneider <valentin.schneider@....com>
> Cc: Nick Piggin <npiggin@....ibm.com>
> Cc: Oliver OHalloran <oliveroh@....ibm.com>
> Cc: Nathan Lynch <nathanl@...ux.ibm.com>
> Cc: Michael Neuling <mikey@...ux.ibm.com>
> Cc: Anton Blanchard <anton@....ibm.com>
> Cc: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
> Cc: Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>
> Cc: Jordan Niethe <jniethe5@...il.com>
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> ---
> Changelog v1 -> v2:
> powerpc/smp: Enable small core scheduling sooner
> Restored the previous info msg (Jordan)
> Moved big core topology fixup to fixup_topology (Gautham)
>
> arch/powerpc/kernel/smp.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 1ce95da00cb6..72f16dc0cb26 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -1370,6 +1370,16 @@ int setup_profiling_timer(unsigned int multiplier)
> return 0;
> }
>
> +static void fixup_topology(void)
> +{
> +#ifdef CONFIG_SCHED_SMT
> + if (has_big_cores) {
> + pr_info("Big cores detected but using small core scheduling\n");
> + powerpc_topology[0].mask = smallcore_smt_mask;
> + }
> +#endif
> +}
> +
> void __init smp_cpus_done(unsigned int max_cpus)
> {
> /*
> @@ -1383,12 +1393,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
>
> dump_numa_cpu_topology();
>
> -#ifdef CONFIG_SCHED_SMT
> - if (has_big_cores) {
> - pr_info("Big cores detected but using small core scheduling\n");
> - powerpc_topology[0].mask = smallcore_smt_mask;
> - }
> -#endif
> + fixup_topology();
> set_sched_topology(powerpc_topology);
> }
>
> --
> 2.17.1
>
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