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Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c29
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)