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    SubjectRe: [PATCH] sysfs: add per pci device msi[x] irq listing (v3)
    On Thu, Sep 22, 2011 at 07:10:46AM -0400, Konrad Rzeszutek Wilk wrote:
    > On Thu, Sep 22, 2011 at 06:57:06AM -0400, Neil Horman wrote:
    > > On Thu, Sep 22, 2011 at 06:49:02AM -0400, Konrad Rzeszutek Wilk wrote:
    > > > On Mon, Sep 19, 2011 at 11:47:15AM -0400, Neil Horman wrote:
    > > > > So a while back, I wanted to provide a way for irqbalance (and other apps) to
    > > > > definitively map irqs to devices, which, for msi[x] irqs is currently not really
    > > > > possible in user space. My first attempt wen't not so well:
    > > > > https://lkml.org/lkml/2011/4/21/308
    > > > >
    > > > > It was plauged by the same issues that prior attempts were, namely that it
    > > > > violated the one-file-one-value sysfs rule. I wandered off but have recently
    > > > > come back to this. I've got a new implementation here that exports a new
    > > > > subdirectory for every pci device, called msi_irqs. This subdirectory contanis
    > > > > a variable number of numbered subdirectories, in which the number represents an
    > > > > msi irq. Each numbered subdirectory contains attributes for that irq, which
    > > > > currently is only the mode it is operating in (msi vs. msix). I think fits
    > > > > within the constraints sysfs requires, and will allow irqbalance to properly map
    > > > > msi irqs to devices without having to rely on rickety, best guess methods like
    > > > > interface name matching.
    > > >
    > > > Are there irqbalance patches that correspond to this? Where would they be available?
    > > >
    > > I've got them here locally, shemminger and I are testing them out, when I'm comfortable with
    > > them, I'll be comitting them to the public repository at code.google.com
    >
    > Right.. asking b/c it might be a good idea to include that in the git
    > description of the patch.
    >
    meh, its generally useful, just so happens I'm updating irqbalance to use it.
    irqd, and all the other vendor specific irqbalance solutions can also make use
    of it. I was going to mention the relationship in the irqbalance changelog
    Neil




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