On Mon, 22 Nov 2010 21:00:52 -0800 Michel Lespinasse <walken@xxxxxxxxxx> wrote: > Hi, > > I'd like to sollicit comments on this proposal: > > Currently mlock() holds mmap_sem in exclusive mode while the pages get > faulted in. In the case of a large mlock, this can potentially take a > very long time. A more compelling description of why this problem needs addressing would help things along. > + /* > + * Limit batch size to 256 pages in order to reduce > + * mmap_sem hold time. > + */ > + nfault = nstart + 256 * PAGE_SIZE; It would be nicer if there was an rwsem API to ask if anyone is currently blocked in down_read() or down_write(). That wouldn't be too hard to do. It wouldn't detect people polling down_read_trylock() or down_write_trylock() though. -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>