static void wb_min_max_ratio(struct bdi_writeback *wb,
unsigned long *minp, unsigned long *maxp)
{
- unsigned long this_bw = wb->avg_write_bandwidth;
+ unsigned long this_bw = READ_ONCE(wb->avg_write_bandwidth);
unsigned long tot_bw = atomic_long_read(&wb->bdi->tot_write_bandwidth);
unsigned long long min = wb->bdi->min_ratio;
unsigned long long max = wb->bdi->max_ratio;
static void wb_position_ratio(struct dirty_throttle_control *dtc)
{
struct bdi_writeback *wb = dtc->wb;
- unsigned long write_bw = wb->avg_write_bandwidth;
+ unsigned long write_bw = READ_ONCE(wb->avg_write_bandwidth);
unsigned long freerun = dirty_freerun_ceiling(dtc->thresh, dtc->bg_thresh);
unsigned long limit = hard_dirty_limit(dtc_dom(dtc), dtc->thresh);
unsigned long wb_thresh = dtc->wb_thresh;
&wb->bdi->tot_write_bandwidth) <= 0);
}
wb->write_bandwidth = bw;
- wb->avg_write_bandwidth = avg;
+ WRITE_ONCE(wb->avg_write_bandwidth, avg);
}
static void update_dirty_limit(struct dirty_throttle_control *dtc)
else
dirty_ratelimit -= step;
- wb->dirty_ratelimit = max(dirty_ratelimit, 1UL);
+ WRITE_ONCE(wb->dirty_ratelimit, max(dirty_ratelimit, 1UL));
wb->balanced_dirty_ratelimit = balanced_dirty_ratelimit;
trace_bdi_dirty_ratelimit(wb, dirty_rate, task_ratelimit);
wb->dirtied_stamp = dirtied;
wb->written_stamp = written;
- wb->bw_time_stamp = now;
+ WRITE_ONCE(wb->bw_time_stamp, now);
spin_unlock(&wb->list_lock);
}
spin_lock(&wb->list_lock);
wb->dirtied_stamp = wb_stat(wb, WB_DIRTIED);
wb->written_stamp = wb_stat(wb, WB_WRITTEN);
- wb->bw_time_stamp = now;
+ WRITE_ONCE(wb->bw_time_stamp, now);
spin_unlock(&wb->list_lock);
}
}
static unsigned long wb_max_pause(struct bdi_writeback *wb,
unsigned long wb_dirty)
{
- unsigned long bw = wb->avg_write_bandwidth;
+ unsigned long bw = READ_ONCE(wb->avg_write_bandwidth);
unsigned long t;
/*
unsigned long dirty_ratelimit,
int *nr_dirtied_pause)
{
- long hi = ilog2(wb->avg_write_bandwidth);
- long lo = ilog2(wb->dirty_ratelimit);
+ long hi = ilog2(READ_ONCE(wb->avg_write_bandwidth));
+ long lo = ilog2(READ_ONCE(wb->dirty_ratelimit));
long t; /* target pause */
long pause; /* estimated next pause */
int pages; /* target nr_dirtied_pause */
if (dirty_exceeded && !wb->dirty_exceeded)
wb->dirty_exceeded = 1;
- if (time_is_before_jiffies(wb->bw_time_stamp +
+ if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) +
BANDWIDTH_INTERVAL))
__wb_update_bandwidth(gdtc, mdtc, true);
/* throttle according to the chosen dtc */
- dirty_ratelimit = wb->dirty_ratelimit;
+ dirty_ratelimit = READ_ONCE(wb->dirty_ratelimit);
task_ratelimit = ((u64)dirty_ratelimit * sdtc->pos_ratio) >>
RATELIMIT_CALC_SHIFT;
max_pause = wb_max_pause(wb, sdtc->wb_dirty);
* but if there's constant writeback being submitted, this makes sure
* writeback bandwidth is updated once in a while.
*/
- if (time_is_before_jiffies(wb->bw_time_stamp + BANDWIDTH_INTERVAL))
+ if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) +
+ BANDWIDTH_INTERVAL))
wb_update_bandwidth(wb);
return ret;
}