From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Juri Lelli <juri.lelli@gmail.com>,
tglx@linutronix.de, mingo@redhat.com, rostedt@goodmis.org,
oleg@redhat.com, fweisbec@gmail.com, darren@dvhart.com,
johan.eker@ericsson.com, p.faure@akatech.ch,
linux-kernel@vger.kernel.org, claudio@evidence.eu.com,
michael@amarulasolutions.com, fchecconi@gmail.com,
tommaso.cucinotta@sssup.it, nicola.manica@disi.unitn.it,
luca.abeni@unitn.it, dhaval.giani@gmail.com, hgu1972@gmail.com,
paulmck@linux.vnet.ibm.com, raistlin@linux.it,
insop.song@gmail.com, liming.wang@windriver.com,
jkacur@redhat.com, harald.gustafsson@ericsson.com,
vincent.guittot@linaro.org,
bruce.ashfield@windriver.com--no-chain-reply-to
Subject: Re: [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw
Date: Wed, 16 Oct 2013 10:59:36 +0200 [thread overview]
Message-ID: <20131016085936.GU10651@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20131015131133.GC2402@gmail.com>
On Tue, Oct 15, 2013 at 03:11:33PM +0200, Ingo Molnar wrote:
> The scheduler has over 800 #ifdefs or similar preprocessor directives:
>
> comet:~/tip> git grep '^#' kernel/sched/ | grep -v include | wc -l
> 855
>
> I'd like to see this simplified a bit, _especially_ before we add new
> complexity ...
I agree; however I also think its unfair to pile this on Juri. Esp the
avenue pushed here, which will increase UP text and (runtime) data
sizes, to which I think some people will still object.
There's this entire 'maker' community (aka. internet of things) now
using very small Linux devices. Think Raspberry-Pi, Intel Quark (however much
I hate Intel for shipping a new 32bit device) etc.
These people are wanting to run Linux on these tiny devices, with tiny
memories etc; we shouldn't make their life harder than it already is.
Also; you didn't object about the 29 new #ifdefs currently in
tip.
How about we use some of the 'quality' conference time in EDI to do some
big code shuffles to get rid of some of them. I'm sure we can reduce the
number of ifdeffery by simply merging various similar blocks and maybe
write a few extra helper functions.
This is how kernel/sched/ got created in the first place; as a means to
keep the fingers busy at a conference ;-)
next prev parent reply other threads:[~2013-10-16 9:00 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-14 10:43 [PATCH 00/14] sched: SCHED_DEADLINE v8 Juri Lelli
2013-10-14 10:43 ` [PATCH 01/14] sched: add sched_class->task_dead Juri Lelli
2013-10-14 10:43 ` [PATCH 02/14] sched: add extended scheduling interface Juri Lelli
2013-10-14 10:43 ` [PATCH 03/14] sched: SCHED_DEADLINE structures & implementation Juri Lelli
2013-10-14 11:10 ` Peter Zijlstra
2013-10-14 13:05 ` Juri Lelli
2013-10-14 13:51 ` Peter Zijlstra
2013-10-14 11:18 ` Peter Zijlstra
2013-10-14 11:24 ` Peter Zijlstra
2013-10-14 14:36 ` Juri Lelli
2013-10-14 11:33 ` Peter Zijlstra
2013-10-14 16:16 ` Juri Lelli
2013-10-14 16:19 ` Peter Zijlstra
2013-10-14 11:44 ` Peter Zijlstra
2013-10-14 16:58 ` Juri Lelli
2013-10-14 17:34 ` Peter Zijlstra
2013-10-14 20:48 ` Juri Lelli
2013-10-14 11:49 ` Peter Zijlstra
2013-10-14 20:36 ` Juri Lelli
2013-10-14 11:51 ` Peter Zijlstra
2013-10-14 21:26 ` Juri Lelli
2013-10-14 10:43 ` [PATCH 04/14] sched: SCHED_DEADLINE SMP-related data structures & logic Juri Lelli
2013-10-14 12:03 ` Peter Zijlstra
2013-10-15 9:36 ` Juri Lelli
2013-10-15 10:35 ` Peter Zijlstra
2013-10-15 11:36 ` Juri Lelli
2013-10-17 16:49 ` [tip:sched/core] sched/rt: Add missing rmb() tip-bot for Peter Zijlstra
2013-10-14 10:43 ` [PATCH 05/14] sched: SCHED_DEADLINE avg_update accounting Juri Lelli
2013-10-14 10:43 ` [PATCH 06/14] sched: add period support for -deadline tasks Juri Lelli
2013-10-14 12:07 ` Peter Zijlstra
2013-10-15 8:23 ` Juri Lelli
2013-10-15 8:43 ` Peter Zijlstra
2013-10-14 10:43 ` [PATCH 07/14] sched: add schedstats " Juri Lelli
2013-10-14 12:08 ` Peter Zijlstra
2013-10-15 9:06 ` Juri Lelli
2013-10-14 10:43 ` [PATCH 08/14] sched: add latency tracing " Juri Lelli
2013-10-14 10:43 ` [PATCH 09/14] rtmutex: turn the plist into an rb-tree Juri Lelli
2013-10-14 10:43 ` [PATCH 10/14] sched: drafted deadline inheritance logic Juri Lelli
2013-10-14 10:43 ` [PATCH 11/14] sched: add bandwidth management for sched_dl Juri Lelli
2013-10-14 10:43 ` [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw Juri Lelli
2013-10-14 14:06 ` Ingo Molnar
2013-10-15 10:00 ` Juri Lelli
2013-10-15 10:26 ` Peter Zijlstra
2013-10-15 11:35 ` Juri Lelli
2013-10-15 12:25 ` Ingo Molnar
2013-10-15 12:35 ` Peter Zijlstra
2013-10-15 13:11 ` Ingo Molnar
2013-10-16 8:59 ` Peter Zijlstra [this message]
2013-10-16 9:19 ` Ingo Molnar
2013-10-14 10:43 ` [PATCH 13/14] sched: speed up -dl pushes with a push-heap Juri Lelli
2013-10-14 10:43 ` [PATCH 14/14] sched: add sched_dl documentation Juri Lelli
2013-10-14 10:53 ` [PATCH 00/14] sched: SCHED_DEADLINE v8 Juri Lelli
2013-10-14 12:24 ` Peter Zijlstra
2013-10-14 12:38 ` Ingo Molnar
2013-10-14 13:22 ` Peter Zijlstra
2013-10-14 13:36 ` Ingo Molnar
2013-10-14 13:50 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2013-11-07 13:43 [PATCH 00/14] sched: SCHED_DEADLINE v9 Juri Lelli
2013-11-07 13:43 ` [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw Juri Lelli
2013-02-11 18:50 [PATCH 00/14] sched: SCHED_DEADLINE v7 Juri Lelli
2013-02-11 18:50 ` [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw Juri Lelli
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