* Theodore Tso <[EMAIL PROTECTED]> wrote: > What we probably need in the long-term, and not just for high > precision wakeups, is we need a way for waiters (either in the kernel > or in userspace) to specify a desired precision in their timers. Is > it, "wake me up in a second, exactly", or "wake me up in a second, > plus or minus 10ms"? (or 50ms? or 100ms?).
such a facility exists already, see round_jiffies() and round_jiffies_relative(). There's some short blurb about it at: http://kernelnewbies.org/LinuxChanges#head-513ceda14f5d8cf5b8a7c81d7e3821543141ecb0 > This becomes especially important if we want the tickless code to > really shine as far as power management is concerned. [...] yes. That's why we also implemented /proc/timer_stat, and this was measured and a few higher-frequency fuzzy waiters were converted to use round_jiffies(). Some other waiters were fixed in user-space. It's all dependent on actual measurements and circumstances. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
