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Message-ID: <20141218144836.0000091d@unknown> Date: Thu, 18 Dec 2014 14:48:36 -0800 From: Jesse Brandeburg <jesse.brandeburg@...el.com> To: Thomas Gleixner <tglx@...utronix.de> Cc: <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] genirq: fix symbol export for __irq_set_affinity On Thu, 18 Dec 2014 23:42:03 +0100 Thomas Gleixner <tglx@...utronix.de> wrote: > On Thu, 18 Dec 2014, Jesse Brandeburg wrote: > > Enabling this function means that kernel drivers can include > > an initial affinity setting for the interrupt, instead of all > > interrupts starting out life on CPU0. It seems to have just > > been an oversight that it was not included. > And why needs this to be called from modules? Just because or is there > a legitimate reason? IOW, you forgot to describe the actual usecase. As stated above, the use case for my interest is making a network driver's many interrupt vectors not all show up on CPU0. Of course a user can work around this by manually tuning smp_affinity, but I have seen many reports from users and testers where the performance of the network was really bad due to all network interrupts on CPU0. This allows the driver to set a sane default smp_affinity value at driver load. Would you instead consider a patch where if a user calls the set_irq_affinity_hint that the initial affinity is set to the hinted value? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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