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Message-ID: <1439117508.21378.8.camel@gmail.com>
Subject: Re: [hack] sched: create PREEMPT_VOLUNTARY_RT and some RT specific
 resched points
From: Mike Galbraith <umgwanakikbuti@gmail.com>
Date: Sun, 09 Aug 2015 12:51:48 +0200
In-Reply-To: <1439112337.5906.43.camel@gmail.com>
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To: =?ISO-8859-1?Q?J=F6rn?= Engel <joern@purestorage.com>
Cc: Michal Hocko <mhocko@kernel.org>, Spencer Baugh <sbaugh@catern.com>, Toshi Kani <toshi.kani@hp.com>, Andrew Morton <akpm@linux-foundation.org>, Fengguang Wu <fengguang.wu@intel.com>, Joern Engel <joern@logfs.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Mel Gorman <mgorman@suse.de>, Johannes Weiner <hannes@cmpxchg.org>, Shachar Raindel <raindel@mellanox.com>, Boaz Harrosh <boaz@plexistor.com>, Andy Lutomirski <luto@amacapital.net>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrey Ryabinin <a.ryabinin@samsung.com>, Roman Pen <r.peniaev@gmail.com>, Andrey Konovalov <adech.fo@gmail.com>, Eric Dumazet <edumazet@google.com>, Dmitry Vyukov <dvyukov@google.com>, Rob Jones <rob.jones@codethink.co.uk>, WANG Chao <chaowang@redhat.com>, open list <linux-kernel@vger.kernel.org>, "open
 list:MEMORY MANAGEMENT" <linux-mm@kvack.org>, Spencer Baugh <Spencer.baugh@purestorage.com>, Peter Zijlstra <peterz@infradead.org>

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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