[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH v2 12/22] xen/arm: its: Update irq descriptor for LPIs support
On 30/03/15 15:32, Vijay Kilari wrote: > Stefano suggested to use arch_irq_desc to hold virq and its_device structure. > Another question is why another structure irq_guest is created?. Can't we > reuse > arch_irq_desc? Here is the answer I gave to Stefano when I introduced this new structure: "I though about it. If we add another field in arch_irq_desc, we will likely use more memory than xmalloc. This is because most of the platform doesn't use 1024 interrupts but about 256 interrupts. As the new field will be a pointer (on ARM64, 8 bytes), that would make Xen use statically about 8K more. We could allocate irq_desc dynamically during Xen boot." This assumption was with only 1 pointer added. As you add 2 pointer, it will add 16k which is mean increase 15% the current size of the final Xen binary. > Is this patch merged?. Not yet. I sent a v4 2 weeks ago and I expect this patch to be merge as soon as Ian has time to review it. Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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