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The return of SEEK_HOLEThe return of SEEK_HOLEPosted May 4, 2011 19:54 UTC (Wed) by chad.netzer (✭ supporter ✭, #4257)In reply to: The return of SEEK_HOLE by dlang Parent article: The return of SEEK_HOLE
> examining a range of memory to find if it's exclusively zero seems like the type of thing that is amiable to optimisation based on the particular CPU in use.
Perhaps, but it's almost certainly I/O bound, not CPU.
If you *really* want to aggressively replace long runs of zeros with holes, in existing files (ie. make them sparser), a background userspace scrubber could be employed; although doing it in-place without forcing a copy (new inode) is tricky. At least some Linux filesystems have, or will have, the ability to "punch holes":
http://permalink.gmane.org/gmane.comp.file-systems.xfs.ge...
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