On Fri, 2010-05-14 at 14:32 -0400, Mathieu Desnoyers wrote: > [CCing memory management specialists] And jet you forgot Jens who wrote it ;-) > So I have three questions here: > > 1 - could we enforce removal of these pages from the page cache by calling > "page_cache_release()" before giving these pages back to the ring buffer ? > > 2 - or maybe is there a page flag we could specify when we allocate them to > ask for these pages to never be put in the page cache ? (but they should be > still usable as write buffers) > > 3 - is there something more we need to do to grab a reference on the pages > before passing them to splice(), so that when we call page_cache_release() > they don't get reclaimed ? There is no guarantee it is the pagecache they end up in, it could be a network packet queue, a pipe, or anything that implements .splice_write. >From what I understand of splice() is that it assumes it passes ownership of the page, you're not supposed to touch them again, non of the above three are feasible. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>