Messages in this thread | | | Subject | [RFC] Patches to reduce delay in arch/kernel/time.c | From | Nigel Cunningham <> | Date | Sat, 08 Jan 2005 20:42:02 +1100 |
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Hi all.
Over the past couple of months there's been a fair bit of discussion regarding clock drift after suspending, big pauses during suspending and resuming and so on. I believe this set of three patches, applied on top of David's patch (now in Linus' tree) may address the remaining issues. Comments please!
Patch 1: Replace multiple calls to get_cmos_time in both suspend and resume routines with a single call. Since get_cmos_time waits for the start of the next second before returning the result, This reduces the delay for suspending and resuming by one second in each case. Patch 2: Make sleep start an unsigned long. This appears to address the occasional 1hr 10min error seen by myself and John (http://lkml.org/lkml/2004/12/15/290). Better solution? Patch 3: Implement a new __get_cmos_time() function which doesn't delay until the start of the new second before returning. Use it in suspending (feel free to correct me, but I don't think having the exact start of the second is necessary here).
Regards,
Nigel -- Nigel Cunningham Software Engineer, Canberra, Australia http://www.cyclades.com
Ph: +61 (2) 6292 8028 Mob: +61 (417) 100 574
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