on 29/10/2010 17:53 Kostik Belousov said the following: > Could it be the priming of the vm object pages content ?
Sorry, not familiar with this term. Do you mean prepopulation of vm object with valid pages? > Due to double-buffering, and (possibly false) optimization to only What optimization? > perform double-buffering when vm object already has some data cached, > reads can prime vm object page list before file is mmapped or > sendfile-ed. > No double-buffering is done to optimize anything. Double-buffering is a consequence of having page cache and ARC. The special "double-buffering code" is to just handle that fact - e.g. making sure that VOP_READ reads data from page cache instead of ARC if it's possible that the data in them differs (i.e. page cache has more recent data). So, if I understood the term 'priming' correctly, no priming should ever occur. -- Andriy Gapon _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
