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3 Commits

Author SHA1 Message Date
Christian Borntraeger
d5cd0343d2 [S390] Fix timeval regression on s390 
commit aa5e97ce4bbc9d5daeec16b1d15bb3f6b7b4f4d4
[PATCH] improve precision of process accounting.

Introduced a timing regression:
-bash-3.2# time ls
real    0m0.006s
user    0m1.754s
sys     0m1.094s

The problem was introduced by an error in cputime_to_timeval.
Cputime is now 1/4096 microsecond, therefore, we have to divide
the remainder with 4096 to get the microseconds.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
 2009-02-19 15:19:19 +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