linux-kernel - Re: [RFC Patch V1 01/30] mm, kernel: Use cpu_to_mem()/numa_mem

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Date:	Sat, 12 Jul 2014 14:32:01 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Balbir Singh <bsingharora@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jan Kara <jack@...e.cz>, Ingo Molnar <mingo@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Xie XiuQi <xiexiuqi@...wei.com>
CC:	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC Patch V1 01/30] mm, kernel: Use cpu_to_mem()/numa_mem_id()
 to support memoryless node

On 2014-07-11 09:37, Jiang Liu wrote:
> When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
> may return a node without memory, and later cause system failure/panic
> when calling kmalloc_node() and friends with returned node id.
> So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
> memory for the/current cpu.
>
> If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
> is the same as cpu_to_node()/numa_node_id().

I think blk-mq requires some of the same help, as do other places in the 
block layer. I'll take a look at that.

As for you smp.c bits here:

Acked-by: Jens Axboe <axboe@...com>

-- 
Jens Axboe

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