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KernelTrap: Swap Pre-Fetching

Sep 05, 2005, 05:00 (0 Talkback[s])

"Con Kolivas posted a patch for the 2.6.13 kernel that implements cache prefetching. The patch is based on earlier work by Thomas Schlichter. Con explains, 'I have resuscitated and rewritten some early prefetch code Thomas Schlichter did in late 2.5 to create a configurable kernel thread that reads in swap from ram in reverse order it was written out. It does this once kswapd has been idle for a minute (implying no current vm stress).' He goes on to explain, 'Note that swapped in pages are kept on backing store (swap), meaning no further I/O is required if the page needs to swap back out...'"

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