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authorTejun Heo <tj@kernel.org>2015-05-23 00:23:34 +0200
committerJens Axboe <axboe@fb.com>2015-06-02 16:38:13 +0200
commit2529bb3aadc40a93e642f5f3650f63379a964467 (patch)
treeced5264ace40ca3cbb6899233f7caa1bd79a0903 /mm/memcontrol.c
parentwriteback: implement memcg wb_domain (diff)
downloadlinux-2529bb3aadc40a93e642f5f3650f63379a964467.tar.xz
linux-2529bb3aadc40a93e642f5f3650f63379a964467.zip
writeback: reset wb_domain->dirty_limit[_tstmp] when memcg domain size changes
The amount of available memory to a memcg wb_domain can change as memcg configuration changes. A domain's ->dirty_limit exists to smooth out sudden drops in dirty threshold; however, when a domain's size actually drops significantly, it hinders the dirty throttling from adjusting to the new configuration leading to unexpected behaviors including unnecessary OOM kills. This patch resolves the issue by adding wb_domain_size_changed() which resets ->dirty_limit[_tstmp] and making memcg call it on configuration changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ce113ddf2fb5..c0b0406ae5ca 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4005,6 +4005,11 @@ static void memcg_wb_domain_exit(struct mem_cgroup *memcg)
wb_domain_exit(&memcg->cgwb_domain);
}
+static void memcg_wb_domain_size_changed(struct mem_cgroup *memcg)
+{
+ wb_domain_size_changed(&memcg->cgwb_domain);
+}
+
struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css);
@@ -4026,6 +4031,10 @@ static void memcg_wb_domain_exit(struct mem_cgroup *memcg)
{
}
+static void memcg_wb_domain_size_changed(struct mem_cgroup *memcg)
+{
+}
+
#endif /* CONFIG_CGROUP_WRITEBACK */
/*
@@ -4624,6 +4633,7 @@ static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
memcg->low = 0;
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;
+ memcg_wb_domain_size_changed(memcg);
}
#ifdef CONFIG_MMU
@@ -5361,6 +5371,7 @@ static ssize_t memory_high_write(struct kernfs_open_file *of,
memcg->high = high;
+ memcg_wb_domain_size_changed(memcg);
return nbytes;
}
@@ -5393,6 +5404,7 @@ static ssize_t memory_max_write(struct kernfs_open_file *of,
if (err)
return err;
+ memcg_wb_domain_size_changed(memcg);
return nbytes;
}