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Date: Sun, 28 Feb 2016 18:01:09 +0100 From: Francois Romieu <romieu@...zoreil.com> To: Mike Galbraith <umgwanakikbuti@...il.com> Cc: Peter Hurley <peter@...leysoftware.com>, Eric Dumazet <edumazet@...gle.com>, David Miller <davem@...emloft.net>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>, dmaengine@...r.kernel.org, John Ogness <john.ogness@...utronix.de>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: Softirq priority inversion from "softirq: reduce latencies" Mike Galbraith <umgwanakikbuti@...il.com> : [...] > Hrm, relatively new + tasklet woes rings a bell. Ah, that.. > > <quote> > What's worse is that at the point where this code was written it was > already well known that tasklets are a steaming pile of crap and > should die. > </quote> > > Source thereof https://lwn.net/Articles/588457/ tasklets are ingrained in the dmaengine API (see Documentation/dmaengine/client.txt and drivers/dma/virt-dma.h::vchan_cookie_complete). Moving everything to irq context or handling his own sub-{jiffy/ms} timer while losing async dma doesn't exactly smell like roses either. :o( -- Ueimor
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