On 07/28/2015 11:03 PM, Thomas Gleixner wrote: > On Tue, 28 Jul 2015, Peter Zijlstra wrote: > >> On Tue, Jul 28, 2015 at 10:23:51PM +0200, Thomas Gleixner wrote: >> >>>> FUTEX_WAKE (since Linux 2.6.0) >>>> This operation wakes at most val of the waiters that are >>>> waiting (e.g., inside FUTEX_WAIT) on the futex word at the >>>> address uaddr. Most commonly, val is specified as either >>>> 1 (wake up a single waiter) or INT_MAX (wake up all wait‐ >>>> ers). No guarantee is provided about which waiters are >>>> awoken (e.g., a waiter with a higher scheduling priority >>>> is not guaranteed to be awoken in preference to a waiter >>>> with a lower priority). >>> >>> That's only correct up to Linux 2.6.21. >>> >>> Since 2.6.22 we have a priority ordered wakeup. For SCHED_OTHER >>> threads this takes the nice level into account. Threads with the same >>> priority are woken in FIFO order. >> >> Maybe don't mention the effects of SCHED_OTHER, order by nice value is >> 'wrong'. > > Indeed. > >> Also, this code seems to use plist, which means it won't do the right >> thing for SCHED_DEADLINE either. >> >> Do we want to go fix that? > > I think so. So, no change to this piece of text then? Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
