linux-kernel - [PATCH 8/8] memcg: generate file modified notifications on "memory.events"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1439315889-3492-9-git-send-email-tj@kernel.org>
Date:	Tue, 11 Aug 2015 13:58:09 -0400
From:	Tejun Heo <tj@...nel.org>
To:	hannes@...xchg.org, lizefan@...wei.com
Cc:	mhocko@...nel.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 8/8] memcg: generate file modified notifications on "memory.events"

cgroup core only recently grew generic notification support.  Wire up
"memory.events" so that it triggers a file modified event whenever its
content changes.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Li Zefan <lizefan@...wei.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...nel.org>
---
 mm/memcontrol.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 78ba418..10db5f1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -295,6 +295,9 @@ struct mem_cgroup {
 	/* OOM-Killer disable */
 	int		oom_kill_disable;
 
+	/* handle for "memory.events" */
+	struct cgroup_file events_file;
+
 	/* protect arrays of thresholds */
 	struct mutex thresholds_lock;
 
@@ -5499,6 +5502,7 @@ static struct cftype memory_files[] = {
 	{
 		.name = "events",
 		.flags = CFTYPE_NOT_ON_ROOT,
+		.file_offset = offsetof(struct mem_cgroup, events_file),
 		.seq_show = memory_events_show,
 	},
 	{ }	/* terminate */
@@ -5530,6 +5534,7 @@ void mem_cgroup_events(struct mem_cgroup *memcg,
 		       unsigned int nr)
 {
 	this_cpu_add(memcg->stat->events[idx], nr);
+	cgroup_file_notify(&memcg->events_file);
 }
 
 /**
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/