linux-kernel - Re: [hack] sched: create PREEMPT_VOLUNTARY_RT and some RT specific resched points

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Message-ID: <1439117508.21378.8.camel@gmail.com>
Date:	Sun, 09 Aug 2015 12:51:48 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Jörn Engel <joern@...estorage.com>
Cc:	Michal Hocko <mhocko@...nel.org>,
	Spencer Baugh <sbaugh@...ern.com>,
	Toshi Kani <toshi.kani@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Joern Engel <joern@...fs.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Shachar Raindel <raindel@...lanox.com>,
	Boaz Harrosh <boaz@...xistor.com>,
	Andy Lutomirski <luto@...capital.net>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Roman Pen <r.peniaev@...il.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Rob Jones <rob.jones@...ethink.co.uk>,
	WANG Chao <chaowang@...hat.com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
	Spencer Baugh <Spencer.baugh@...estorage.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [hack] sched: create PREEMPT_VOLUNTARY_RT and some RT specific
 resched points

Damn, the hunk below was supposed to go away before hack escaped.

The whole thing is just a "could we maybe...", but just in case anybody
plays with it, that hunk proved to be a bad idea, kill it.

> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -280,6 +280,8 @@ asmlinkage __visible void __do_softirq(v
>  		}
>  		h++;
>  		pending >>= softirq_bit;
> +		if (need_resched_rt() && current != this_cpu_ksoftirqd())
> +			break;



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