|From:||John Stultz <firstname.lastname@example.org>|
|Subject:||[PATCH 0/2] [RFC] Introduce CLOCK_BOOTTIME|
|Date:||Wed, 15 Dec 2010 16:40:46 -0800|
|Cc:||John Stultz <email@example.com>, Jamie Lokier <firstname.lastname@example.org>, Thomas Gleixner <email@example.com>, Alexander Shishkin <firstname.lastname@example.org>, =?UTF-8?q?Arve=20Hj=F8nnev=E5g?= <email@example.com>|
After some discussions with Jamie Lokier about some of the drawbacks of CLOCK_MONOTONIC not incrementing during suspend (see http://www.spinics.net/lists/linux-fsdevel/msg40272.html), I wanted to see if we couldn't provide a new clockid that would allow applications that wanted to be aware of time passing during suspend without having to deal with the inconsistencies of CLOCK_REALTIME caused by calls to settimeofday. So this patchset introduces CLOCK_BOOTTIME, which is identical to CLOCK_MONOTONIC, but includes any time spent in suspend. This is just my initial stab at this, so I'd appreciate any comments or thougths on these patches. Jamie: On platforms that don't implement read_persistent_clock, your issue would still be present, but fixing that is on my list. Other then that issue, does this seem to address your concern? Thomas: Let me know if the hrtimer_base indirection is too gross. It just seemed silly to create 5 empty bases so we could have an exact match between the clockids and the bases. Arve: I believe CLOCK_BOOTTIME would be sufficient for what Android is using as elapsedRealtime() or ANDROID_ALARM_ELAPSED_REALTIME. If not please let me know why. thanks -john CC: Jamie Lokier <firstname.lastname@example.org> CC: Thomas Gleixner <email@example.com> CC: Alexander Shishkin <firstname.lastname@example.org> CC: Arve Hj??<email@example.com> John Stultz (2): hrtimers: extend hrtimer base code to handle more then 2 clockids hrtimers: Add CLOCK_BOOTTIME clockid, hrtimerbase and posix interface include/linux/hrtimer.h | 22 ++++++++++++- include/linux/time.h | 4 ++ kernel/hrtimer.c | 44 ++++++++++++++++--------- kernel/posix-timers.c | 16 ++++++++- kernel/time/timekeeping.c | 79 ++++++++++++++++++++++++++++++++++++++++++++- 5 files changed, 146 insertions(+), 19 deletions(-) -- 22.214.171.124.146.gca209 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.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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