Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections

Avi Kivity
2010-09-28T16:35:28Z

On 09/28/2010 05:12 PM, Robin Holt wrote:
> > Why not update sysfs directory creation to be fast, for example by
> > using an rbtree instead of a linked list. This fixes an
> > implementation problem in the kernel instead of working around it
> > and creating a new ABI.
>
> Because the old ABI creates 129,000+ entries inside
> /sys/devices/system/memory with their associated links from
> /sys/devices/system/node/node*/ back to those directory entries.
>
> Thankfully things like rpm, hald, and other miscellaneous commands scan
> that information. On our 8 TB test machine, hald runs continuously
> following boot for nearly an hour mostly scanning useless information
> from /sys/

I see - so the problem wasn't just kernel internal; the ABI itself was
unsuitable. Too bad this wasn't considered at the time it was added.

(129k entries / 1 hour = 35 entries/sec; not very impressive)

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error compiling committee.c: too many arguments to function