diff options
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 56c0bffa9f49..2c90357c34ea 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -684,13 +684,19 @@ static unsigned long hard_dirty_limit(struct wb_domain *dom, return max(thresh, dom->dirty_limit); } -/* memory available to a memcg domain is capped by system-wide clean memory */ -static void mdtc_cap_avail(struct dirty_throttle_control *mdtc) +/* + * Memory which can be further allocated to a memcg domain is capped by + * system-wide clean memory excluding the amount being used in the domain. + */ +static void mdtc_calc_avail(struct dirty_throttle_control *mdtc, + unsigned long filepages, unsigned long headroom) { struct dirty_throttle_control *gdtc = mdtc_gdtc(mdtc); - unsigned long clean = gdtc->avail - min(gdtc->avail, gdtc->dirty); + unsigned long clean = filepages - min(filepages, mdtc->dirty); + unsigned long global_clean = gdtc->avail - min(gdtc->avail, gdtc->dirty); + unsigned long other_clean = global_clean - min(global_clean, clean); - mdtc->avail = min(mdtc->avail, clean); + mdtc->avail = filepages + min(headroom, other_clean); } /** @@ -1564,16 +1570,16 @@ static void balance_dirty_pages(struct address_space *mapping, } if (mdtc) { - unsigned long writeback; + unsigned long filepages, headroom, writeback; /* * If @wb belongs to !root memcg, repeat the same * basic calculations for the memcg domain. */ - mem_cgroup_wb_stats(wb, &mdtc->avail, &mdtc->dirty, - &writeback); - mdtc_cap_avail(mdtc); + mem_cgroup_wb_stats(wb, &filepages, &headroom, + &mdtc->dirty, &writeback); mdtc->dirty += writeback; + mdtc_calc_avail(mdtc, filepages, headroom); domain_dirty_limits(mdtc); @@ -1895,10 +1901,11 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb) return true; if (mdtc) { - unsigned long writeback; + unsigned long filepages, headroom, writeback; - mem_cgroup_wb_stats(wb, &mdtc->avail, &mdtc->dirty, &writeback); - mdtc_cap_avail(mdtc); + mem_cgroup_wb_stats(wb, &filepages, &headroom, &mdtc->dirty, + &writeback); + mdtc_calc_avail(mdtc, filepages, headroom); domain_dirty_limits(mdtc); /* ditto, ignore writeback */ if (mdtc->dirty > mdtc->bg_thresh) |