The patch titled
Subject: samples: introduce new samples subdir for cgroup
has been added to the -mm mm-unstable branch. Its filename is
samples-introduce-new-samples-subdir-for-cgroup.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/samples-introduce-new-samples-subdir-for-cgroup.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: samples: introduce new samples subdir for cgroup
Date: Thu, 23 Nov 2023 10:19:43 +0300
Patch series "samples: introduce cgroup events listeners", v3.
To begin with, this patch series relocates the cgroup example code to the
samples/cgroup directory, which is the appropriate location for such code
snippets.
Furthermore, a new memcg events listener is introduced. This listener is
a simple yet effective tool for monitoring memory events and managing
counter changes during runtime.
Additionally, as per Andrew Morton's suggestion, a helpful reminder
comment is included in the memcontrol implementation. This comment serves
to ensure that the samples code is updated whenever new events are added.
This patch (of 3):
Move the cgroup_event_listener for cgroup v1 to the samples directory.
This suggestion was proposed by Andrew Morton during the discussion [1].
Link: https://lore.kernel.org/all/20231106140934.3f5d4960141562fe8da53906@xxxxxxxxxxxxxxxxxxxx/ [1]
Link: https://lkml.kernel.org/r/20231123071945.25811-1-ddrokosov@xxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20231123071945.25811-2-ddrokosov@xxxxxxxxxxxxxxxxx
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
MAINTAINERS | 1 +
samples/Kconfig | 6 ++++++
samples/Makefile | 1 +
samples/cgroup/Makefile | 5 +++++
tools/cgroup/Makefile | 11 -----------
5 files changed, 13 insertions(+), 11 deletions(-)
--- a/MAINTAINERS~samples-introduce-new-samples-subdir-for-cgroup
+++ a/MAINTAINERS
@@ -5352,6 +5352,7 @@ L: linux-mm@xxxxxxxxx
S: Maintained
F: mm/memcontrol.c
F: mm/swap_cgroup.c
+F: samples/cgroup/*
F: tools/testing/selftests/cgroup/memcg_protection.m
F: tools/testing/selftests/cgroup/test_hugetlb_memcg.c
F: tools/testing/selftests/cgroup/test_kmem.c
--- /dev/null
+++ a/samples/cgroup/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+userprogs-always-y += cgroup_event_listener
+
+userccflags += -I usr/include
--- a/samples/Kconfig~samples-introduce-new-samples-subdir-for-cgroup
+++ a/samples/Kconfig
@@ -285,6 +285,12 @@ config SAMPLE_KMEMLEAK
Build a sample program which have explicitly leaks memory to test
kmemleak
+config SAMPLE_CGROUP
+ bool "Build cgroup sample code"
+ depends on CGROUPS && CC_CAN_LINK && HEADERS_INSTALL
+ help
+ Build samples that demonstrate the usage of the cgroup API.
+
source "samples/rust/Kconfig"
endif # SAMPLES
--- a/samples/Makefile~samples-introduce-new-samples-subdir-for-cgroup
+++ a/samples/Makefile
@@ -3,6 +3,7 @@
subdir-$(CONFIG_SAMPLE_AUXDISPLAY) += auxdisplay
subdir-$(CONFIG_SAMPLE_ANDROID_BINDERFS) += binderfs
+subdir-$(CONFIG_SAMPLE_CGROUP) += cgroup
obj-$(CONFIG_SAMPLE_CONFIGFS) += configfs/
obj-$(CONFIG_SAMPLE_CONNECTOR) += connector/
obj-$(CONFIG_SAMPLE_FANOTIFY_ERROR) += fanotify/
--- a/tools/cgroup/Makefile
+++ /dev/null
@@ -1,11 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# Makefile for cgroup tools
-
-CFLAGS = -Wall -Wextra
-
-all: cgroup_event_listener
-%: %.c
- $(CC) $(CFLAGS) -o $@ $^
-
-clean:
- $(RM) cgroup_event_listener
_
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
samples-introduce-new-samples-subdir-for-cgroup.patch
samples-cgroup-introduce-memcg-memoryevents-listener.patch
mm-memcg-add-reminder-comment-for-the-memcg-v2-events.patch
