From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Neuling <mikey@neuling.org>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>,
Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>,
"Oliver O'Halloran" <oohall@gmail.com>,
Nicholas Piggin <npiggin@gmail.com>,
Murilo Opsfelder Araujo <muriloo@linux.ibm.com>,
Anton Blanchard <anton@samba.org>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 2/2] powerpc: Use cpu_smallcore_sibling_mask at SMT level on bigcores
Date: Mon, 20 Aug 2018 11:05:03 -0700 [thread overview]
Message-ID: <20180820180503.GB23117@linux.vnet.ibm.com> (raw)
In-Reply-To: <1534743704-4760-3-git-send-email-ego@linux.vnet.ibm.com>
* Gautham R. Shenoy <ego@linux.vnet.ibm.com> [2018-08-20 11:11:44]:
> From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
>
> Each of the SMT4 cores forming a big-core are more or less independent
> units. Thus when multiple tasks are scheduled to run on the fused
> core, we get the best performance when the tasks are spread across the
> pair of SMT4 cores.
>
> This patch achieves this by setting the SMT level mask to correspond
> to the smallcore sibling mask on big-core systems. This patch also
> ensures that while checked for shared-caches on big-core system, we
> use the smallcore_sibling_mask to compare with the l2_cache_mask.
> This ensure that the CACHE level sched-domain is created, whose groups
> correspond to the threads of the big-core.
>
> With this patch, the SMT sched-domain with SMT=8,4,2 on big-core
> systems are as follows:
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
prev parent reply other threads:[~2018-08-20 18:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-20 5:41 [PATCH v7 0/2] powerpc: Detection and scheduler optimization for POWER9 bigcore Gautham R. Shenoy
2018-08-20 5:41 ` [PATCH v7 1/2] powerpc: Detect the presence of big-cores via "ibm,thread-groups" Gautham R. Shenoy
2018-08-20 17:59 ` Srikar Dronamraju
2018-08-29 7:04 ` Michael Neuling
2018-08-29 7:13 ` Michael Neuling
2018-08-20 5:41 ` [PATCH v7 2/2] powerpc: Use cpu_smallcore_sibling_mask at SMT level on bigcores Gautham R. Shenoy
2018-08-20 18:05 ` Srikar Dronamraju [this message]
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