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[S390] pm: ignore time spend in suspended state

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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>
This commit is contained in:
Martin Schwidefsky 2009-10-06 10:34:11 +02:00 committed by Martin Schwidefsky
parent 942b7e65c3
commit 623c08e4cb
1 changed files with 17 additions and 4 deletions
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21
arch/s390/kernel/swsusp_asm64.S
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@ -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)