Messages in this thread | | | Date | Thu, 13 Jul 2006 09:48:33 -0700 | From | Zach Brown <> | Subject | Re: io_submit() taking a long time to return ? |
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> what do u means by "sync block mapping " ?
To find out what blocks to issue async IO against the submission path reads metadata from the file system that maps file regions to disk blocks. These metadata reads are synchronous and so can block the submitting task. The mappings tend to be cached, though, which is why this doesn't seem to be a problem in practice.
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