lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[S390] boot cputime accounting

Browse Source 
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>
This commit is contained in:
Martin Schwidefsky
2009-04-14 15:36:29 +02:00
parent b6112ccbff
commit ab96e798cb
4 changed files with 43 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/s390/kernel/head.S
View File

@ -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)