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

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Date:	Wed, 18 May 2011 10:45:59 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Andreas Herrmann <andreas.herrmann3@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] sched: fix constructing the span cpu mask of sched domain

On Tue, May 17, 2011 at 10:36 PM, Hillf Danton <dhillf@...il.com> wrote:
> 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.

Hint: before sending your patch out, you could run
kernel-dir/scripts/checkpatch.pl on your patch, then fix the warning/error.

Thanks,
Yong




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