You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

john stultz da15cfdae0 time: Introduce CLOCK_REALTIME_COARSE ... After talking with some application writers who want very fast, but not fine-grained timestamps, I decided to try to implement new clock_ids to clock_gettime(): CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE which returns the time at the last tick. This is very fast as we don't have to access any hardware (which can be very painful if you're using something like the acpi_pm clocksource), and we can even use the vdso clock_gettime() method to avoid the syscall. The only trade off is you only get low-res tick grained time resolution. This isn't a new idea, I know Ingo has a patch in the -rt tree that made the vsyscall gettimeofday() return coarse grained time when the vsyscall64 sysctrl was set to 2. However this affects all applications on a system. With this method, applications can choose the proper speed/granularity trade-off for themselves. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: nikolag@ca.ibm.com Cc: Darren Hart <dvhltc@us.ibm.com> Cc: arjan@infradead.org Cc: jonathan@jonmasters.org LKML-Reference: <1250734414.6897.5.camel@localhost.localdomain> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		16 years ago
..
vdso32	…
.gitignore	…
Makefile	gcov: enable GCOV_PROFILE_ALL for x86_64	16 years ago
vclock_gettime.c	time: Introduce CLOCK_REALTIME_COARSE	16 years ago
vdso-layout.lds.S	…
vdso-note.S	…
vdso.S	…
vdso.lds.S	…
vdso32-setup.c	x86: Set context.vdso before installing the mapping	16 years ago
vdso32.S	…
vextern.h	…
vgetcpu.c	…
vma.c	Merge branch 'linus' into perfcounters/core	16 years ago
vvar.c	…