[PATCH] improve precision of process accounting.

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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>

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This commit is contained in:

Martin Schwidefsky 2008-12-31 15:11:39 +01:00

parent 79741dd357

commit aa5e97ce4b

5 changed files with 85 additions and 96 deletions

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42

arch/s390/include/asm/cputime.h

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40

arch/s390/include/asm/lowcore.h

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4

arch/s390/include/asm/system.h

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2

arch/s390/include/asm/thread_info.h

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91

arch/s390/kernel/vtime.c

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