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authorTejun Heo <tj@kernel.org>2019-08-29 15:47:19 -0700
committerJens Axboe <axboe@kernel.dk>2019-08-30 07:42:49 -0600
commit3a8e9ac89e6a5106cfb6b85d4c9cf9bfa3519bc7 (patch)
tree690ba707f1bd5b427751ff434fc27ae7fd022ab0 /mm/memcontrol.c
parente916ad29d96485e5aa3d3237bfeab1522c713d5e (diff)
writeback: add tracepoints for cgroup foreign writebacks
cgroup foreign inode handling has quite a bit of heuristics and internal states which sometimes makes it difficult to understand what's going on. Add tracepoints to improve visibility. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 89b65f5ca634..4390994e8be9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4066,6 +4066,8 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css,
#ifdef CONFIG_CGROUP_WRITEBACK
+#include <trace/events/writeback.h>
+
static int memcg_wb_domain_init(struct mem_cgroup *memcg, gfp_t gfp)
{
return wb_domain_init(&memcg->cgwb_domain, gfp);
@@ -4203,6 +4205,8 @@ void mem_cgroup_track_foreign_dirty_slowpath(struct page *page,
int oldest = -1;
int i;
+ trace_track_foreign_dirty(page, wb);
+
/*
* Pick the slot to use. If there is already a slot for @wb, keep
* using it. If not replace the oldest one which isn't being
@@ -4263,6 +4267,7 @@ void mem_cgroup_flush_foreign(struct bdi_writeback *wb)
if (time_after64(frn->at, now - intv) &&
atomic_read(&frn->done.cnt) == 1) {
frn->at = 0;
+ trace_flush_foreign(wb, frn->bdi_id, frn->memcg_id);
cgroup_writeback_by_id(frn->bdi_id, frn->memcg_id, 0,
WB_REASON_FOREIGN_FLUSH,
&frn->done);