On Tue 11-03-14 11:25:41, Matthias Wirth wrote: > Backups, logrotation and indexers don't need files they read to remain > in the page cache. Their pages can be reclaimed early and should not > displace useful pages. POSIX specifices the POSIX_FADV_NOREUSE flag for > these use cases but it's currently a noop. Why don't you use POSIX_FADV_DONTNEED when you no longer use those pages? E.g. on close()? > In our implementation pages marked with the NoReuse flag are added to > the tail of the LRU list the first time they are read. Therefore they > are the first to be reclaimed. page flags are really scarce and I am not sure this is the best usage of the few remaining slots. > We needed to add flags to the file and page structs in order to pass > down the hint to the actual call to list_add. > > Signed-off-by: Matthias Wirth <matthias.wirth@xxxxxxxxx> > Signed-off-by: Lukas Senger <lukas@xxxxxxxxxxxx> [...] -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>