Fix a race situation for global variable dirtylimit_state. Also, replace usleep by g_usleep to increase platform accessibility to the sleep function.
Signed-off-by: Hyman Huang <yong.hu...@smartx.com> Reviewed-by: Fabiano Rosas <faro...@suse.de> --- system/dirtylimit.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/system/dirtylimit.c b/system/dirtylimit.c index fa959d7743..3666c4cb7c 100644 --- a/system/dirtylimit.c +++ b/system/dirtylimit.c @@ -411,12 +411,20 @@ void dirtylimit_set_all(uint64_t quota, void dirtylimit_vcpu_execute(CPUState *cpu) { - if (dirtylimit_in_service() && - dirtylimit_vcpu_get_state(cpu->cpu_index)->enabled && - cpu->throttle_us_per_full) { - trace_dirtylimit_vcpu_execute(cpu->cpu_index, - cpu->throttle_us_per_full); - usleep(cpu->throttle_us_per_full); + if (cpu->throttle_us_per_full) { + dirtylimit_state_lock(); + + if (dirtylimit_in_service() && + dirtylimit_vcpu_get_state(cpu->cpu_index)->enabled) { + dirtylimit_state_unlock(); + trace_dirtylimit_vcpu_execute(cpu->cpu_index, + cpu->throttle_us_per_full); + + g_usleep(cpu->throttle_us_per_full); + return; + } + + dirtylimit_state_unlock(); } } -- 2.39.1