I want something similar

I want something similar

Posted Mar 13, 2005 18:16 UTC (Sun) by farnz (subscriber, #17727)
In reply to: I want something similar by ncm
Parent article: Flushing the page cache from user space

posix_fadvise already provides that functionality. posix_fadvise(fd,0,0,POSIX_FADV_NOREUSE); will tell the kernel that each byte of a file is only accessed once, while posix_fadvise(fd,start,len,POSIX_FADV_DONTNEED); will tell the kernel that a particular range of data is finished with.

Apart from developer time, there's no real reason not to use posix_fadvise and posix_madvise (the equivalent for memory mapped objects); if the kernel doesn't handle them, they get ignored, and they make it possible for the kernel to do more intelligent caching if it does understand them.

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