Messages in this thread |  | | Date | Tue, 20 Nov 2001 15:05:44 -0800 | From | Andrew Morton <> | Subject | Re: Swap |
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Dan Maas wrote: > > > Uhhhh, read his original mail. When using mmap() he had > > problems with the VM doing bad page replacement, while > > read() was smooth. > > I should add that I did experiment with madvise(MADV_SEQUENTIAL) on the > mapping, and with madvise(MADV_WILLNEED) on pages about to be needed. These > had no effect. What *did* help with underruns was pre-touching each page in > a large block (120KB), before sending that block to the output device. At > that point I thought the mmap() code was getting to be more complicated that > it was worth so I just dropped back to read()...
There's a new system call, sys_readahead() which does what you want.
It would be nice to make the pagein code smarter though.
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