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>
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>
Date: Sun, 09 Aug 2015 12:51:48 +0200
In-Reply-To: <1439112337.5906.43.camel@gmail.com>
References: <1437688476-3399-3-git-send-email-sbaugh@catern.com>
	 <20150724070420.GF4103@dhcp22.suse.cz>
	 <20150724165627.GA3458@Sligo.logfs.org>
	 <20150727070840.GB11317@dhcp22.suse.cz>
	 <20150727151814.GR9641@Sligo.logfs.org>
	 <20150728133254.GI24972@dhcp22.suse.cz>
	 <20150728170844.GY9641@Sligo.logfs.org>
	 <20150729095439.GD15801@dhcp22.suse.cz>
	 <1438269775.23663.58.camel@gmail.com>
	 <20150730165803.GA17882@Sligo.logfs.org>
	 <1438282521.6432.53.camel@gmail.com> <1439112337.5906.43.camel@gmail.com>
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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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