| |||||||||||||
Turning off cachingTurning off cachingPosted Aug 11, 2013 1:28 UTC (Sun) by giraffedata (subscriber, #1954)In reply to: Turning off caching by sbohrer Parent article: A survey of memory management patches I don't know exactly what Linux's current page replacement policy is, but this problem of sequential read of a file too big to fit in cache pushing other stuff out of cache as it goes, called a cache sweep, was solved long ago. The kernel should detect that this is happening and stop caching that file before it does much harm, and I presume that it does. That would explain why Linux doesn't do anything special with POSIX_FADV_NOREUSE. I know that even before modern cache sweep protection was invented, Linux avoided much of the pain by using version of second-chance, so that these pages, since they were referenced only once, would be the first to be evicted and most of the pages that would actually be referenced again would remain.
(Log in to post comments)
|
|||||||||||||