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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-10-06 10:34:11 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-10-06 10:35:09 +0200
commit623c08e4cbf47c29c2516d53f1d78c20896bb712 (patch)
treeb3c2e08498e7837fb5675fe7196a8279b778f476 /arch/s390
parent942b7e65c321b72e1d73daee45291300be87c62b (diff)
downloadop-kernel-dev-623c08e4cbf47c29c2516d53f1d78c20896bb712.zip
op-kernel-dev-623c08e4cbf47c29c2516d53f1d78c20896bb712.tar.gz
[S390] pm: ignore time spend in suspended state
The time a system has been suspended should not show up in any of the cputime accounting fields. The time of inactivity is definitly not any form of real cputime nor is it idle time. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/swsusp_asm64.S21
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index fe927d0..008e35a 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -69,8 +69,21 @@ swsusp_arch_suspend:
stmg %r0,%r15,0x280(%r1) /* store general registers */
stpt 0x328(%r1) /* store timer */
+ stck __SF_EMPTY(%r15) /* store clock */
stckc 0x330(%r1) /* store clock comparator */
+ /* Update cputime accounting before going to sleep */
+ lg %r0,__LC_LAST_UPDATE_TIMER
+ slg %r0,0x328(%r1)
+ alg %r0,__LC_SYSTEM_TIMER
+ stg %r0,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),0x328(%r1)
+ lg %r0,__LC_LAST_UPDATE_CLOCK
+ slg %r0,__SF_EMPTY(%r15)
+ alg %r0,__LC_STEAL_TIMER
+ stg %r0,__LC_STEAL_TIMER
+ mvc __LC_LAST_UPDATE_CLOCK(8),__SF_EMPTY(%r15)
+
/* Activate DAT */
stosm __SF_EMPTY(%r15),0x04
@@ -200,8 +213,11 @@ restart_suspend:
restore_registers:
/* Restore registers */
- lghi %r13,0x1000 /* %r1 = pointer to save arae */
+ lghi %r13,0x1000 /* %r1 = pointer to save area */
+ /* Ignore time spent in suspended state. */
+ llgf %r1,0x318(%r13)
+ stck __LC_LAST_UPDATE_CLOCK(%r1)
spt 0x328(%r13) /* reprogram timer */
//sckc 0x330(%r13) /* set clock comparator */
@@ -229,9 +245,6 @@ restore_registers:
/* Load old stack */
lg %r15,0x2f8(%r13)
- /* Pointer to save area */
- lghi %r13,0x1000
-
/* Restore prefix register */
spx 0x318(%r13)
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