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authorsujiaxun <sujiaxun@uniontech.com>2022-02-18 05:51:48 +0300
committerLuis Chamberlain <mcgrof@kernel.org>2022-04-06 23:43:44 +0300
commit43fe219aa56a2fdd8f0623c9470a32b14b0617a5 (patch)
treef1c1b49c0981513e0540f4a682db1050a37b9852 /mm/oom_kill.c
parent06d177662fb86b80c7fc2290667b9a14cb0bd925 (diff)
downloadlinux-43fe219aa56a2fdd8f0623c9470a32b14b0617a5.tar.xz
mm: move oom_kill sysctls to their own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty dishes, this makes it very difficult to maintain. To help with this maintenance let's start by moving sysctls to places where they actually belong. The proc sysctl maintainers do not want to know what sysctl knobs you wish to add for your own piece of code, we just care about the core logic. So move the oom_kill sysctls to their own file, mm/oom_kill.c [sfr@canb.auug.org.au: null-terminate the array] Link: https://lkml.kernel.org/r/20220216193202.28838626@canb.auug.org.au Link: https://lkml.kernel.org/r/20220215093203.31032-1-sujiaxun@uniontech.com Signed-off-by: sujiaxun <sujiaxun@uniontech.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Kees Cook <keescook@chromium.org> Cc: Iurii Zaikin <yzaikin@google.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c38
1 files changed, 35 insertions, 3 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 7ec38194f8e1..7cc338a9e9e4 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -52,9 +52,38 @@
#define CREATE_TRACE_POINTS
#include <trace/events/oom.h>
-int sysctl_panic_on_oom;
-int sysctl_oom_kill_allocating_task;
-int sysctl_oom_dump_tasks = 1;
+static int sysctl_panic_on_oom;
+static int sysctl_oom_kill_allocating_task;
+static int sysctl_oom_dump_tasks = 1;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table vm_oom_kill_table[] = {
+ {
+ .procname = "panic_on_oom",
+ .data = &sysctl_panic_on_oom,
+ .maxlen = sizeof(sysctl_panic_on_oom),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ {
+ .procname = "oom_kill_allocating_task",
+ .data = &sysctl_oom_kill_allocating_task,
+ .maxlen = sizeof(sysctl_oom_kill_allocating_task),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "oom_dump_tasks",
+ .data = &sysctl_oom_dump_tasks,
+ .maxlen = sizeof(sysctl_oom_dump_tasks),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {}
+};
+#endif
/*
* Serializes oom killer invocations (out_of_memory()) from all contexts to
@@ -677,6 +706,9 @@ static void wake_oom_reaper(struct task_struct *tsk)
static int __init oom_init(void)
{
oom_reaper_th = kthread_run(oom_reaper, NULL, "oom_reaper");
+#ifdef CONFIG_SYSCTL
+ register_sysctl_init("vm", vm_oom_kill_table);
+#endif
return 0;
}
subsys_initcall(oom_init)