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

From: Hillf Danton
Date: Tue May 17 2011 - 10:36:27 EST

On Tue, May 17, 2011 at 5:23 PM, Andreas Herrmann
<andreas.herrmann3@xxxxxxx> 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@xxxxxxxxxxxxx> wrote:
>> > On Wed, 2011-05-11 at 21:26 +0800, Hillf Danton wrote:
>> >> Your work for rewriting NUMA support, published at
>> >> Â Â Â Â Â
>> >> 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:
> Â# scripts/ your_patch.diff
> ÂERROR: patch seems to be corrupt (line wrapped?)
> Â#175: FILE: kernel/sched.c:6822:
> Â*(*sched_domain_mask_f)(int cpu);
> ÂWARNING: line over 80 characters
> Â#222: FILE: kernel/sched.c:7088:
> Â+ Â Â return per_cpu_ptr(sched_domains_numa_masks[sched_domains_curr_level], cpu);
> ÂWARNING: printk() should include KERN_ facility level
> Â#239: FILE: kernel/sched.c:7105:
> Â+ Â Â Â Â Â Â Â Â printk("distance(0,%d): %d\n", j, distance);
> ÂERROR: need consistent spacing around '-' (ctx:WxV)
> Â#253: FILE: kernel/sched.c:7119:
> Â+ Â Â Â Â Â Â Â Â for (k = level -1; k >= i; k--)
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^
> Â...
> (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.

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