The patch titled
Subject: mm: memcg: print out cgroup ino in the memcg tracepoints
has been added to the -mm mm-unstable branch. Its filename is
mm-memcg-print-out-cgroup-ino-in-the-memcg-tracepoints.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcg-print-out-cgroup-ino-in-the-memcg-tracepoints.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
Subject: mm: memcg: print out cgroup ino in the memcg tracepoints
Date: Thu, 23 Nov 2023 22:39:36 +0300
Patch series "mm: memcg: improve vmscan tracepoints", v3.
The motivation behind this commit is to enhance the traceability and
understanding of memcg events. By integrating the function cgroup_ino()
into the existing memcg tracepoints, this patch series introduces a new
tracepoint template for the begin() and end() events. It utilizes a new
entry field ino to store the cgroup ino, enabling developers to easily
identify the cgroup associated with a specific memcg tracepoint event.
Additionally, this patch series introduces new shrink_memcg tracepoints to
facilitate non-direct memcg reclaim tracing and debugging.
This patch (of 2):
Sometimes, it becomes necessary to determine the memcg tracepoint event
that has occurred. This is particularly relevant in scenarios involving a
large cgroup hierarchy, where users may wish to trace the process of
reclamation within a specific cgroup(s) by applying a filter.
The function cgroup_ino() is a useful tool for this purpose. To integrate
cgroup_ino() into the existing memcg tracepoints, this patch introduces a
new tracepoint template for the begin() and end() events.
Link: https://lkml.kernel.org/r/20231123193937.11628-1-ddrokosov@xxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20231123193937.11628-2-ddrokosov@xxxxxxxxxxxxxxxxx
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/trace/events/vmscan.h | 73 ++++++++++++++++++++++++++------
mm/vmscan.c | 10 ++--
2 files changed, 66 insertions(+), 17 deletions(-)
--- a/include/trace/events/vmscan.h~mm-memcg-print-out-cgroup-ino-in-the-memcg-tracepoints
+++ a/include/trace/events/vmscan.h
@@ -141,19 +141,45 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_be
);
#ifdef CONFIG_MEMCG
-DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin,
- TP_PROTO(int order, gfp_t gfp_flags),
+DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_begin_template,
- TP_ARGS(order, gfp_flags)
+ TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg),
+
+ TP_ARGS(order, gfp_flags, memcg),
+
+ TP_STRUCT__entry(
+ __field(int, order)
+ __field(unsigned long, gfp_flags)
+ __field(ino_t, ino)
+ ),
+
+ TP_fast_assign(
+ __entry->order = order;
+ __entry->gfp_flags = (__force unsigned long)gfp_flags;
+ __entry->ino = cgroup_ino(memcg->css.cgroup);
+ ),
+
+ TP_printk("order=%d gfp_flags=%s memcg=%ld",
+ __entry->order,
+ show_gfp_flags(__entry->gfp_flags),
+ __entry->ino)
);
-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(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg),
- TP_ARGS(order, gfp_flags)
+ TP_ARGS(order, gfp_flags, memcg)
);
+
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin,
+
+ TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg),
+
+ TP_ARGS(order, gfp_flags, memcg)
+);
+
#endif /* CONFIG_MEMCG */
DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template,
@@ -181,19 +207,42 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_en
);
#ifdef CONFIG_MEMCG
-DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end,
- TP_PROTO(unsigned long nr_reclaimed),
+DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_end_template,
- TP_ARGS(nr_reclaimed)
+ TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg),
+
+ TP_ARGS(nr_reclaimed, memcg),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, nr_reclaimed)
+ __field(ino_t, ino)
+ ),
+
+ TP_fast_assign(
+ __entry->nr_reclaimed = nr_reclaimed;
+ __entry->ino = cgroup_ino(memcg->css.cgroup);
+ ),
+
+ TP_printk("nr_reclaimed=%lu memcg=%ld",
+ __entry->nr_reclaimed,
+ __entry->ino)
);
-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 long nr_reclaimed, const struct mem_cgroup *memcg),
- TP_ARGS(nr_reclaimed)
+ TP_ARGS(nr_reclaimed, memcg)
);
+
+DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end,
+
+ TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg),
+
+ TP_ARGS(nr_reclaimed, memcg)
+);
+
#endif /* CONFIG_MEMCG */
TRACE_EVENT(mm_shrink_slab_start,
--- a/mm/vmscan.c~mm-memcg-print-out-cgroup-ino-in-the-memcg-tracepoints
+++ a/mm/vmscan.c
@@ -6415,8 +6415,8 @@ unsigned long mem_cgroup_shrink_node(str
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(sc.order, sc.gfp_mask,
+ memcg);
/*
* NOTE: Although we can get the priority field, using it
@@ -6427,7 +6427,7 @@ unsigned long mem_cgroup_shrink_node(str
*/
shrink_lruvec(lruvec, &sc);
- trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
+ trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed, memcg);
*nr_scanned = sc.nr_scanned;
@@ -6461,13 +6461,13 @@ unsigned long try_to_free_mem_cgroup_pag
struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
set_task_reclaim_state(current, &sc.reclaim_state);
- trace_mm_vmscan_memcg_reclaim_begin(0, sc.gfp_mask);
+ trace_mm_vmscan_memcg_reclaim_begin(0, sc.gfp_mask, memcg);
noreclaim_flag = memalloc_noreclaim_save();
nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
memalloc_noreclaim_restore(noreclaim_flag);
- trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed);
+ trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed, memcg);
set_task_reclaim_state(current, NULL);
return nr_reclaimed;
_
Patches currently in -mm which might be from ddrokosov@xxxxxxxxxxxxxxxxx are
mm-memcg-print-out-cgroup-ino-in-the-memcg-tracepoints.patch
mm-memcg-introduce-new-event-to-trace-shrink_memcg.patch
