Re: [PATCH v2 2/3] mm/sparse: fix possible memory leak

[Dave Hansen <dave@linux.vnet.ibm.com>]

On 06/27/2012 11:03 PM, Gavin Shan wrote:
>> >Gavin, have you actually tested this in some way?  It looks OK to me,
>> >but I worry that you've just added a block of code that's exceedingly
>> >unlikely to get run.
> I didn't test this and I just catch the point while reading the source
> code. By the way, I would like to know the popular utilities used for
> memory testing. If you can share some information regarding that, that
> would be great.
> 
> 	- memory related benchmark testing utility.
> 	- some documents on Linux memory testing.

This patch is intended to fix a memory leak in the case of a race.  Can
you _actually_ make it race to ensure that things work properly?  If
not, can you add something like a sleep() to _force_ it to race?

Or, have you simply run your code a couple of times like this, both for
the bootmem and slab cases:

	int nid = 0;
	for (i=0; i < something; i++) {
		section = sparse_index_alloc(nid);
		sparse_index_free(section, nid);
	}

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