From: Jason Gunthorpe <jgg@ziepe.ca>
To: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Xianting Tian <tian.xianting@h3c.com>,
mike.marciniszyn@intel.com, dennis.dalessandro@intel.com,
dledford@redhat.com, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] IB/hfi1: Avoid allocing memory on memoryless numa node
Date: Fri, 16 Oct 2020 11:11:52 -0300 [thread overview]
Message-ID: <20201016141152.GC36674@ziepe.ca> (raw)
In-Reply-To: <9ba33073-044c-9da6-a90d-4626e6441793@cornelisnetworks.com>
On Mon, Oct 12, 2020 at 08:36:57AM -0400, Dennis Dalessandro wrote:
> On 10/10/2020 4:57 AM, Xianting Tian wrote:
> > In architecture like powerpc, we can have cpus without any local memory
> > attached to it. In such cases the node does not have real memory.
> >
> > Use local_memory_node(), which is guaranteed to have memory.
> > local_memory_node is a noop in other architectures that does not support
> > memoryless nodes.
> >
> > Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
> > drivers/infiniband/hw/hfi1/file_ops.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c
> > index 8ca51e43c..79fa22cc7 100644
> > +++ b/drivers/infiniband/hw/hfi1/file_ops.c
> > @@ -965,7 +965,7 @@ static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
> > */
> > fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
> > if (fd->rec_cpu_num != -1)
> > - numa = cpu_to_node(fd->rec_cpu_num);
> > + numa = local_memory_node(cpu_to_node(fd->rec_cpu_num));
> > else
> > numa = numa_node_id();
> > ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
> >
>
> The hfi1 driver depends on X86_64. I'm not sure what this patch buys, can
> you expand a bit?
Yikes, that is strongly discouraged.
Jason
next prev parent reply other threads:[~2020-10-16 14:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-10 8:57 [PATCH] IB/hfi1: Avoid allocing memory on memoryless numa node Xianting Tian
2020-10-12 12:36 ` Dennis Dalessandro
2020-10-12 13:24 ` Tianxianting
2020-10-16 14:11 ` Jason Gunthorpe [this message]
2020-10-16 15:14 ` Dennis Dalessandro
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