From: Nathan Lynch <nathanl@linux.ibm.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH v4 4/5] powerpc/numa: Early request for home node associativity
Date: Wed, 02 Oct 2019 12:56:43 -0500 [thread overview]
Message-ID: <87imp7jajo.fsf@linux.ibm.com> (raw)
In-Reply-To: <20190913110945.12564-5-srikar@linux.vnet.ibm.com>
Srikar Dronamraju <srikar@linux.vnet.ibm.com> writes:
> Currently the kernel detects if its running on a shared lpar platform
> and requests home node associativity before the scheduler sched_domains
> are setup. However between the time NUMA setup is initialized and the
> request for home node associativity, workqueue initializes its per node
> cpumask. The per node workqueue possible cpumask may turn invalid
> after home node associativity resulting in weird situations like
> workqueue possible cpumask being a subset of workqueue online cpumask.
>
> This can be fixed by requesting home node associativity earlier just
> before NUMA setup. However at the NUMA setup time, kernel may not be in
> a position to detect if its running on a shared lpar platform. So
> request for home node associativity and if the request fails, fallback
> on the device tree property.
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
next prev parent reply other threads:[~2019-10-02 18:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-13 11:09 [PATCH v4 0/5] Early node associativity Srikar Dronamraju
2019-09-13 11:09 ` [PATCH v4 1/5] powerpc/vphn: Check for error from hcall_vphn Srikar Dronamraju
2019-10-02 17:51 ` Nathan Lynch
2019-09-13 11:09 ` [PATCH v4 2/5] powerpc/numa: Handle extra hcall_vphn error cases Srikar Dronamraju
2019-10-02 17:54 ` Nathan Lynch
2019-09-13 11:09 ` [PATCH v4 3/5] powerpc/numa: Use cpu node map of first sibling thread Srikar Dronamraju
2019-10-02 17:55 ` Nathan Lynch
2019-09-13 11:09 ` [PATCH v4 4/5] powerpc/numa: Early request for home node associativity Srikar Dronamraju
2019-10-02 17:56 ` Nathan Lynch [this message]
2019-09-13 11:09 ` [PATCH v4 5/5] powerpc/numa: Remove late " Srikar Dronamraju
2019-10-02 17:57 ` Nathan Lynch
2019-10-02 17:59 ` [PATCH v4 0/5] Early " Nathan Lynch
2019-10-17 12:27 ` Nathan Lynch
2019-11-15 13:37 ` Srikar Dronamraju
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