On 30 April 2012 19:30, Jan Kara [off-list ref] wrote:

This is a long standing problem (or a surprising feature) in our implementation
of get_user_pages() (used by direct IO). Since several attempts to fix it
failed (e.g.
http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-04/msg06542.html, or
http://lkml.indiana.edu/hypermail/linux/kernel/0903.1/01498.html refused in
http://comments.gmane.org/gmane.linux.kernel.mm/31569) and it's not completely
clear whether we really want to fix it given the costs, let's at least document
it.

In any case, it should be documented even if it is ever fixed in newer
kernels. Thanks!

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>