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Endless garbage collection


It's possible to get the garbage collection going in an endless loop by
creating lots of small files. eg, if I create 25 files, each 0 bytes long,
on an empty filesystem, garbage collection starts and goes on and on.

Perhaps the test for too much RAM being used in thread_should_wake() ought
to take the number of files into account? ie should it be:

	/* If there is too much RAM used by the various structures, GC */
	if (jffs_get_node_inuse() >
(c->fmc->used_size/c->fmc->max_chunk_size * 5 + 25 + jffs_get_file_count()))

where  jffs_get_file_count() returns the number of files on the filesystem.


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