Re: [PATCH] pci/pcie: Avoid unnecessary PCIe link retrains

From: Bjorn Helgaas
Date: Thu Nov 05 2009 - 15:29:51 EST

On Thursday 05 November 2009 12:07:07 pm Matthew Wilcox wrote:
> On Thu, Nov 05, 2009 at 12:59:25PM -0600, Bjorn Helgaas wrote:
> > Here's another possibility, the idea being to collect all the PCIe
> > stuff in one place. This would require a lot of changes in the PCIe
> > driver code, but most of them would be trivial.
> I don't like the idea of kmallocing a 6- or 10-byte data structure
> ... better to keep it in the pci_dev. Maybe embedding a pcie_dev inside
> the pci_dev would be a good idea, but unless there're more things to
> move to it, this seems like a net loss to me.

That's true, it's not worth it for such a small structure. I figured
there would probably be more PCIe-related stuff that could go there,
e.g., embedding the link_state directly. But I haven't looked to
see whether there actually is enough PCIe stuff to make it worthwhile.


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