mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Heiko CarstensandAlexander Gordeev
4fe307f0f5
The upcoming cpu idle time accounting rework involves comparing and subtracting cross cpu time stamps. Time stamps created with the stckf instruction monotonic with respect to the local cpu. For cross cpu monotonic time stamps the slightly slower stcke instruction has to be used [1]. Convert the idle time accounting relevant usages of stckf to stcke. [1] Principles of Operation - Setting and Inspecting the Clock Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _S390_VTIME_H
|
|
#define _S390_VTIME_H
|
|
|
|
#include <asm/lowcore.h>
|
|
#include <asm/cpu_mf.h>
|
|
#include <asm/idle.h>
|
|
|
|
DECLARE_PER_CPU(u64, mt_cycles[8]);
|
|
|
|
static inline void update_timer_sys(void)
|
|
{
|
|
struct lowcore *lc = get_lowcore();
|
|
|
|
lc->system_timer += lc->last_update_timer - lc->exit_timer;
|
|
lc->user_timer += lc->exit_timer - lc->sys_enter_timer;
|
|
lc->last_update_timer = lc->sys_enter_timer;
|
|
}
|
|
|
|
static inline void update_timer_mcck(void)
|
|
{
|
|
struct lowcore *lc = get_lowcore();
|
|
|
|
lc->system_timer += lc->last_update_timer - lc->exit_timer;
|
|
lc->user_timer += lc->exit_timer - lc->mcck_enter_timer;
|
|
lc->last_update_timer = lc->mcck_enter_timer;
|
|
}
|
|
|
|
static inline void update_timer_idle(void)
|
|
{
|
|
struct s390_idle_data *idle = this_cpu_ptr(&s390_idle);
|
|
struct lowcore *lc = get_lowcore();
|
|
u64 cycles_new[8];
|
|
int i, mtid;
|
|
|
|
mtid = smp_cpu_mtid;
|
|
if (mtid) {
|
|
stcctm(MT_DIAG, mtid, cycles_new);
|
|
for (i = 0; i < mtid; i++)
|
|
__this_cpu_add(mt_cycles[i], cycles_new[i] - idle->mt_cycles_enter[i]);
|
|
}
|
|
/*
|
|
* This is a bit subtle: Forward last_update_clock so it excludes idle
|
|
* time. For correct steal time calculation in do_account_vtime() add
|
|
* passed wall time before idle_enter to steal_timer:
|
|
* During the passed wall time before idle_enter CPU time may have
|
|
* been accounted to system, hardirq, softirq, etc. lowcore fields.
|
|
* The accounted CPU times will be subtracted again from steal_timer
|
|
* when accumulated steal time is calculated in do_account_vtime().
|
|
*/
|
|
lc->steal_timer += idle->clock_idle_enter.tod - lc->last_update_clock;
|
|
lc->last_update_clock = lc->int_clock.tod;
|
|
lc->system_timer += lc->last_update_timer - idle->timer_idle_enter;
|
|
lc->last_update_timer = lc->sys_enter_timer;
|
|
}
|
|
|
|
#endif /* _S390_VTIME_H */
|