what does alloc_calls and free_calls mean? - memory-management

Can anyone tell me what the output of the following implies,
/sys/kernel/slab/kmalloc-128/alloc_calls
/sys/kernel/slab/kmalloc-128/free_calls
Thanks in advance

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Assistance Identifying Unknown Grasshopper Line Operation

Can anybody help me identify the grasshopper line operation circled in red? I am stumped.... any help would be much appreciated! Thank you!
Unknown Line operation
that is called "point on curve"

Response selector -- using variables

My scrapy script returns results when xpaths are hard coded but does not work with variables. What am I missing
The following works:
response.selector.xpath('//*[(#id = "abc")]').extract()
The following DOES NOT works:
response.xpath("{}".format(xpath_variable)).extract()
Can someone please tell me what I'm doing wrong. Thanks!
Just figured this out. There was a mistake with my code since I was replacing text within the xpath. Variables do in fact work. Thanks for looking into this Tomas!

How to find the xpath for this?

For below code:
Edit Details
I am arriving this xpath: ("//a[#href='profile?action=edit'")
it says invalid xpath.
Can any one let me know pls?
Thanks
This should work:
//a[#href='profile?action=edit']

Need Information on XslCompiledTransform in Plain English

Does anybody have any links that explain proper implementation of the XSLCompiledTransform? Thanks
http://msdn.microsoft.com/en-us/library/system.xml.xsl.xslcompiledtransform.aspx

What is the meaning and impication of one-element-too-large array/queue?

just wondering what it is.
Edit: I know it's not a type of array but just a feature. So what does it mean by one-element-too-large ?
Misunderstanding of language specific indexing conventions?
Intent to use a "end of data" marker?
Maybe the classic fence-post/fence-panel counting problem?

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