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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-31 17:11:39 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-31 17:11:47 +0300
commitaa5e97ce4bbc9d5daeec16b1d15bb3f6b7b4f4d4 (patch)
tree6bf29daaaca165108bcafa68105d18e64ef01ea2 /arch/s390/include/asm/thread_info.h
parent79741dd35713ff4f6fd0eafd59fa94e8a4ba922d (diff)
downloadlinux-aa5e97ce4bbc9d5daeec16b1d15bb3f6b7b4f4d4.tar.xz
[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>
Diffstat (limited to 'arch/s390/include/asm/thread_info.h')
-rw-r--r--arch/s390/include/asm/thread_info.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index c1eaf9604da7..c544aa524535 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -47,6 +47,8 @@ struct thread_info {
unsigned int cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
struct restart_block restart_block;
+ __u64 user_timer;
+ __u64 system_timer;
};
/*