We can use the exposed cgroup_ino to trace specified cgroup.
For example,
step 1, get the inode of the specified cgroup
$ ls -di /tmp/cgroupv2/foo
step 2, set this inode into tracepoint filter to trace this cgroup only
(assume the inode is 11)
$ cd /sys/kernel/debug/tracing/events/vmscan/
$ echo 'cgroup_ino == 11' > mm_vmscan_memcg_reclaim_begin/filter
$ echo 'cgroup_ino == 11' > mm_vmscan_memcg_reclaim_end/filter
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
v2: rebase it against the latest -mmotm
---
include/trace/events/vmscan.h | 71 +++++++++++++++++++++++++++++++++++--------
mm/vmscan.c | 18 ++++++++---
2 files changed, 72 insertions(+), 17 deletions(-)
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index a5ab297..c37e228 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -127,18 +127,43 @@
);
#ifdef CONFIG_MEMCG
-DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin,
+DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_begin_template,
- TP_PROTO(int order, gfp_t gfp_flags),
+ TP_PROTO(unsigned int cgroup_ino, int order, gfp_t gfp_flags),
- TP_ARGS(order, gfp_flags)
+ TP_ARGS(cgroup_ino, order, gfp_flags),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cgroup_ino)
+ __field(int, order)
+ __field(gfp_t, gfp_flags)
+ ),
+
+ TP_fast_assign(
+ __entry->cgroup_ino = cgroup_ino;
+ __entry->order = order;
+ __entry->gfp_flags = gfp_flags;
+ ),
+
+ TP_printk("cgroup_ino=%u order=%d gfp_flags=%s",
+ __entry->cgroup_ino, __entry->order,
+ show_gfp_flags(__entry->gfp_flags))
);
-DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin,
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template,
+ mm_vmscan_memcg_reclaim_begin,
- TP_PROTO(int order, gfp_t gfp_flags),
+ TP_PROTO(unsigned int cgroup_ino, int order, gfp_t gfp_flags),
- TP_ARGS(order, gfp_flags)
+ TP_ARGS(cgroup_ino, order, gfp_flags)
+);
+
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template,
+ mm_vmscan_memcg_softlimit_reclaim_begin,
+
+ TP_PROTO(unsigned int cgroup_ino, int order, gfp_t gfp_flags),
+
+ TP_ARGS(cgroup_ino, order, gfp_flags)
);
#endif /* CONFIG_MEMCG */
@@ -167,18 +192,40 @@
);
#ifdef CONFIG_MEMCG
-DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end,
+DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_end_template,
- TP_PROTO(unsigned long nr_reclaimed),
+ TP_PROTO(unsigned int cgroup_ino, unsigned long nr_reclaimed),
- TP_ARGS(nr_reclaimed)
+ TP_ARGS(cgroup_ino, nr_reclaimed),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cgroup_ino)
+ __field(unsigned long, nr_reclaimed)
+ ),
+
+ TP_fast_assign(
+ __entry->cgroup_ino = cgroup_ino;
+ __entry->nr_reclaimed = nr_reclaimed;
+ ),
+
+ TP_printk("cgroup_ino=%u nr_reclaimed=%lu",
+ __entry->cgroup_ino, __entry->nr_reclaimed)
);
-DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end,
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template,
+ mm_vmscan_memcg_reclaim_end,
- TP_PROTO(unsigned long nr_reclaimed),
+ TP_PROTO(unsigned int cgroup_ino, unsigned long nr_reclaimed),
- TP_ARGS(nr_reclaimed)
+ TP_ARGS(cgroup_ino, nr_reclaimed)
+);
+
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template,
+ mm_vmscan_memcg_softlimit_reclaim_end,
+
+ TP_PROTO(unsigned int cgroup_ino, unsigned long nr_reclaimed),
+
+ TP_ARGS(cgroup_ino, nr_reclaimed)
);
#endif /* CONFIG_MEMCG */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d9c3e87..91c50dc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3244,8 +3244,10 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
- trace_mm_vmscan_memcg_softlimit_reclaim_begin(sc.order,
- sc.gfp_mask);
+ trace_mm_vmscan_memcg_softlimit_reclaim_begin(
+ cgroup_ino(memcg->css.cgroup),
+ sc.order,
+ sc.gfp_mask);
/*
* NOTE: Although we can get the priority field, using it
@@ -3256,7 +3258,9 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
*/
shrink_node_memcg(pgdat, memcg, &sc);
- trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
+ trace_mm_vmscan_memcg_softlimit_reclaim_end(
+ cgroup_ino(memcg->css.cgroup),
+ sc.nr_reclaimed);
*nr_scanned = sc.nr_scanned;
return sc.nr_reclaimed;
@@ -3294,7 +3298,9 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
zonelist = &NODE_DATA(nid)->node_zonelists[ZONELIST_FALLBACK];
- trace_mm_vmscan_memcg_reclaim_begin(0, sc.gfp_mask);
+ trace_mm_vmscan_memcg_reclaim_begin(
+ cgroup_ino(memcg->css.cgroup),
+ 0, sc.gfp_mask);
psi_memstall_enter(&pflags);
noreclaim_flag = memalloc_noreclaim_save();
@@ -3304,7 +3310,9 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
memalloc_noreclaim_restore(noreclaim_flag);
psi_memstall_leave(&pflags);
- trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed);
+ trace_mm_vmscan_memcg_reclaim_end(
+ cgroup_ino(memcg->css.cgroup),
+ nr_reclaimed);
return nr_reclaimed;
}
--
1.8.3.1
