linux-kernel - Re: [PATCH] sched: fix constructing the span cpu mask of sched domain

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Date:	Tue, 17 May 2011 22:36:21 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>
Subject: Re: [PATCH] sched: fix constructing the span cpu mask of sched domain

On Tue, May 17, 2011 at 5:23 PM, Andreas Herrmann
<andreas.herrmann3@....com> wrote:
> On Sun, May 15, 2011 at 01:50:42AM -0400, Hillf Danton wrote:
>> On Wed, May 11, 2011 at 9:54 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>> > On Wed, 2011-05-11 at 21:26 +0800, Hillf Danton wrote:
>> >> Your work for rewriting NUMA support, published at
>> >>          http://marc.info/?l=linux-kernel&m=130218515520540
>> >> is patched by changing how level is computed and by changing how it is
>> >> used to build the mask.
>> >>
>> >> When computing, some valid levels are lost in your work.
>> >>
>> >> When building mask, nodes are selected only if they have same distance,
>> >> thus nodes of less distance are also masked out since the computation of
>> >> level now is tough.
>> >>
>> >> Without MUNA hardware, I did not test the patch:(
>> >
>> > I do have a (tiny) NUMA box (2 nodes) but that actually booted with the
>> > old code too, Andreas Hermann from AMD (CC'ed) is usually willing to
>> > test such patches on somewhat larger systems. Please send a full patch
>> > against tip/master for him to apply.
>> >
>>
>> Hi Peter
>>
>> With the guiding from Ingo on git fetch the tip/master, the work is
>> now finished:)
>>
>> Hopely it is not too late for Andreas.
>>
>> In the following, the concern is also added for distances not covered by level,
>> please review again.
>
> Sorry, can't test your stuff. What git-tree and branch did you use to
> build this patch?
>
> Your patch seems to be corrupted/broken:
>
>  # scripts/checkpatch.pl your_patch.diff
>  ERROR: patch seems to be corrupt (line wrapped?)
>  #175: FILE: kernel/sched.c:6822:
>  *(*sched_domain_mask_f)(int cpu);
>
>  WARNING: line over 80 characters
>  #222: FILE: kernel/sched.c:7088:
>  +     return per_cpu_ptr(sched_domains_numa_masks[sched_domains_curr_level], cpu);
>
>  WARNING: printk() should include KERN_ facility level
>  #239: FILE: kernel/sched.c:7105:
>  +                 printk("distance(0,%d): %d\n", j, distance);
>
>  ERROR: need consistent spacing around '-' (ctx:WxV)
>  #253: FILE: kernel/sched.c:7119:
>  +                 for (k = level -1; k >= i; k--)
>                               ^
>  ...
>
> (I assume that it wasn't corrupted on my end.)
>
>
Hi Andreas

First I say sorry to you for the not well prepared patch.

Since I am not good at playing git, I am not sure the patch was
against the latest tip/master,
and I have no idea about the ERROR above.

Then it looks better that Peter will prepare the patch again.

thanks
            Hillf
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