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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:36:29 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:37:27 +0200
commitab96e798cbd562a53edd802272e49a5100b29efb (patch)
tree4b3558bc97f5c2fc5c63789431deef79534e3bd3 /arch/s390/kernel/head.S
parentb6112ccbff5ec580d46b584ecc3c3a773b830da2 (diff)
[S390] boot cputime accounting
Start the cpu time accounting very early to catch the cpu time spent for the initial kernel setup. To make the output of /proc/uptime match the sum of all cpu accounting values of the boot cpu reset xtime and wall_to_monotonic to sane values based on the TOD clock. The values set by timekeeping_init are off by up to a second. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head.S')
-rw-r--r--arch/s390/kernel/head.S8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 16f8975325e..bba14494ee0 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -473,7 +473,10 @@ startup:basr %r13,0 # get base
xc 0x300(256),0x300
l %r1,5f-.LPG0(%r13)
stck 0(%r1)
-
+ spt 6f-.LPG0(%r13)
+ mvc __LC_LAST_UPDATE_CLOCK(8),0(%r1)
+ mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
+ mvc __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
#ifndef CONFIG_MARCH_G5
# check processor version against MARCH_{G5,Z900,Z990,Z9_109,Z10}
stidp __LC_CPUID # store cpuid
@@ -500,8 +503,11 @@ startup:basr %r13,0 # get base
l %r13,4f-.LPG0(%r13)
b 0(%r13)
+ .align 4
4: .long startup_continue
5: .long sched_clock_base_cc
+ .align 8
+6: .long 0x7fffffff,0xffffffff
#
# params at 10400 (setup.h)