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authorDavid Woodhouse <dwmw2@infradead.org>2006-05-14 04:06:24 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-05-14 04:06:24 +0100
commitcf5eba53346fbfdf1b80e05ca3fd7fe2ec841077 (patch)
tree22e24ce02de0ddd1c7a1113a59f0cac157aa9dab /drivers/mtd
parent151e76590f66f5406eb2e1f4270c5323f385d2e8 (diff)
[JFFS2] Reduce excessive node count for syslog files.
We currently get fairly poor behaviour with files which get many short writes, such as system logs. This is because we end up with many tiny data nodes, and the rbtree gets massive. None of these nodes are actually obsolete, so they are counted as 'clean' space. Eraseblocks can be entirely full of these nodes (which are REF_NORMAL instead of REF_PRISTINE), and still they count entirely towards 'used_size' and the eraseblocks can sit on the clean_list for a long time without being picked for GC. One way to alleviate this in the long term is to account REF_NORMAL space separately from REF_PRISTINE space, rather than counting them both towards used_size. Then these eraseblocks can be picked for GC and the offending nodes will be garbage collected. The short-term fix, though -- which probably makes sense even if we do eventually implement the above -- is to merge these nodes as they're written. When we write the last byte in a page, write the _whole_ page. This obsoletes the earlier nodes in the page _immediately_ and we don't even need to wait for the garbage collection to do it. Original implementation from Ferenc Havasi <havasi@inf.u-szeged.hu> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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