3 Commits

Author	SHA1	Message	Date
Martin Schwidefsky	c742b31c03	[PATCH] fast vdso implementation for CLOCK_THREAD_CPUTIME_ID ... The extract cpu time instruction (ectg) instruction allows the user process to get the current thread cputime without calling into the kernel. The code that uses the instruction needs to switch to the access registers mode to get access to the per-cpu info page that contains the two base values that are needed to calculate the current cputime from the CPU timer with the ectg instruction. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2008-12-31 15:11:49 +01:00
Martin Schwidefsky	aa5e97ce4b	[PATCH] improve precision of process accounting. ... The unit of the cputime accouting values that are stored per process is currently a microsecond. The CPU timer has a maximum granularity of 2**-12 microseconds. There is no benefit in storing the per process values in the lesser precision and there is the disadvantage that the backend has to do the rounding to microseconds. The better solution is to use the maximum granularity of the CPU timer as cputime unit. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2008-12-31 15:11:47 +01:00
Martin Schwidefsky	c6557e7f2b	[S390] move include/asm-s390 to arch/s390/include/asm ... Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>	2008-08-01 20:42:05 +02:00