This patch eliminates call of the cpu_get_real_ticks while enabling or disabling the virtual timer in icount mode. These calls are used for cpu_ticks_offset which is not needed in this mode.
Signed-off-by: Pavel Dovgalyuk <pavel.dovga...@ispras.ru> --- cpus.c | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/cpus.c b/cpus.c index 2ec6d75..15ac3a1 100644 --- a/cpus.c +++ b/cpus.c @@ -267,8 +267,10 @@ void cpu_enable_ticks(void) /* Here, the really thing protected by seqlock is cpu_clock_offset. */ seqlock_write_lock(&timers_state.vm_clock_seqlock); if (!timers_state.cpu_ticks_enabled) { - timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); - timers_state.cpu_clock_offset -= get_clock(); + if (!use_icount) { + timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); + timers_state.cpu_clock_offset -= get_clock(); + } timers_state.cpu_ticks_enabled = 1; } seqlock_write_unlock(&timers_state.vm_clock_seqlock); @@ -283,8 +285,10 @@ void cpu_disable_ticks(void) /* Here, the really thing protected by seqlock is cpu_clock_offset. */ seqlock_write_lock(&timers_state.vm_clock_seqlock); if (timers_state.cpu_ticks_enabled) { - timers_state.cpu_ticks_offset += cpu_get_real_ticks(); - timers_state.cpu_clock_offset = cpu_get_clock_locked(); + if (!use_icount) { + timers_state.cpu_ticks_offset += cpu_get_real_ticks(); + timers_state.cpu_clock_offset = cpu_get_clock_locked(); + } timers_state.cpu_ticks_enabled = 0; } seqlock_write_unlock(&timers_state.vm_clock_seqlock);