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Date: Tue, 31 May 2011 23:07:47 -0700 From: John Stultz <john.stultz@...aro.org> To: linux-kernel@...r.kernel.org Cc: John Stultz <john.stultz@...aro.org>, Arve Hjønnevåg <arve@...roid.com>, Thomas Gleixner <tglx@...utronix.de> Subject: [RFC][PATCH 0/2] Avoid accumulating drift in suspend/resume Arve Hjønnevåg noted that in the suspend/resume path, we're likely to see half-second errors from each read of the RTC. If a system is frequently suspended, these errors will accumulate quickly. Arve's solution was to compare the time delta between the system time and the RTC, for each suspend. If the difference is small, use the same delta for each suspend. This consistency avoids the error from accumulating. This patch set implements Arve's suggestion for both the RTC and persistent clock suspend paths. Initial tests show that this improves time accuracy over many repeated suspends. So while testing continues, I just wanted to send this out for review and feedback. thanks -john CC: Arve Hjønnevåg <arve@...roid.com> CC: Thomas Gleixner <tglx@...utronix.de> John Stultz (2): time: Avoid accumulating time drift in suspend/resume rtc: Avoid accumulating time drift in suspend/resume drivers/rtc/class.c | 65 +++++++++++++++++++++++++++++++++------------ kernel/time/timekeeping.c | 22 +++++++++++++++ 2 files changed, 70 insertions(+), 17 deletions(-) -- 1.7.3.2.146.gca209 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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