linux

Commit Graph

Author	SHA1	Message	Date
Chris Metcalf	78410af511	tile: add clock_gettime support to vDSO This change adds support for clock_gettime with CLOCK_REALTIME and CLOCK_MONOTONIC using vDSO. It also updates the vdso struct nomenclature used for the clocks to match the x86 code to keep it easier to update going forward. We also support the *_COARSE clockid_t, for apps that want speed but aren't concerned about fine-grained timestamps; this saves about 20 cycles per call (see http://lwn.net/Articles/342018/). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: John Stultz <john.stultz@linaro.org>	2014-10-02 13:56:07 -04:00
Chris Metcalf	94fb1afbcb	tile: switch to using seqlocks for the vDSO time code Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>	2014-10-02 10:48:12 -04:00
Thomas Gleixner	dc01c9fae1	tile: Convert VDSO timekeeping to the precise mechanism The code was only halfarsed converted to the new VSDO update mechanism and still uses the inaccurate base value which lacks the fractional part of xtime_nsec. Fix it up. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>	2014-07-23 10:16:50 -07:00
Chris Metcalf	4a556f4f56	tile: implement gettimeofday() via vDSO This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>	2013-08-13 16:26:21 -04:00

4 Commits