Messages in this thread | | | Date | Mon, 3 Feb 2003 10:28:00 +0200 | From | Matti Aarnio <> | Subject | Re: [PATCH *] use 64 bit jiffies |
| |
On Mon, Feb 03, 2003 at 08:42:59AM +0200, Denis Vlasenko wrote: > On 3 February 2003 00:55, Tim Schmielau wrote: > > Just a note that I have rediffed for 2.5.55 the patches that use the > > 64 bit jiffies value to avoid uptime and process start time wrap > > after 49.5 days. I will push them Linus-wards when he's back. > > They can be retrieved from .... > Wow... your patches are STILL not included?? > My 2.4 based server approaches 250 days uptime, it would be a shame > to be unable to have uptime < 50 days with 2.5
You don't need to have 64-bit jiffy for things like internal timers, nor for uptime tracking.
Timers have well behaving constructs to use 32-bit jiffy quite successfully, and 64-bit values, especially atomicish, in 32-bit register-poor machines (i386) are damn difficult.
I do have a number of machines with 100 to 300 day uptimes, all with "mere" 32-bit jiffy. With 1000 Hz clock that means at least one full wrap-around of jiffy.
> -- > vda
/Matti Aarnio - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |