The patch titled
Subject: tracepoint: add tracepoints for debugging oom_score_adj
has been added to the -mm tree. Its filename is
tracepoint-add-tracepoints-for-debugging-oom_score_adj.patch
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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Subject: tracepoint: add tracepoints for debugging oom_score_adj
oom_score_adj is used for guarding processes from OOM-Killer. One of
problem is that it's inherited at fork(). When a daemon set oom_score_adj
and make children, it's hard to know where the value is set.
This patch adds some tracepoints useful for debugging. This patch adds
3 trace points.
- creating new task
- renaming a task (exec)
- set oom_score_adj
To debug, users need to enable some trace pointer. Maybe filtering is useful as
# EVENT=/sys/kernel/debug/tracing/events/task/
# echo "oom_score_adj != 0" > $EVENT/task_newtask/filter
# echo "oom_score_adj != 0" > $EVENT/task_rename/filter
# echo 1 > $EVENT/enable
# EVENT=/sys/kernel/debug/tracing/events/oom/
# echo 1 > $EVENT/enable
output will be like this.
# grep oom /sys/kernel/debug/tracing/trace
bash-7699 [007] d..3 5140.744510: oom_score_adj_update: pid=7699 comm=bash oom_score_adj=-1000
bash-7699 [007] ...1 5151.818022: task_newtask: pid=7729 comm=bash clone_flags=1200011 oom_score_adj=-1000
ls-7729 [003] ...2 5151.818504: task_rename: pid=7729 oldcomm=bash newcomm=ls oom_score_adj=-1000
bash-7699 [002] ...1 5175.701468: task_newtask: pid=7730 comm=bash clone_flags=1200011 oom_score_adj=-1000
grep-7730 [007] ...2 5175.701993: task_rename: pid=7730 oldcomm=bash newcomm=grep oom_score_adj=-1000
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 4 ++
fs/proc/base.c | 3 +
include/trace/events/oom.h | 35 ++++++++++++++++++
include/trace/events/task.h | 63 ++++++++++++++++++++++++++++++++++
kernel/fork.c | 6 +++
mm/oom_kill.c | 6 +++
6 files changed, 117 insertions(+)
diff -puN fs/exec.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj fs/exec.c
--- a/fs/exec.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj
+++ a/fs/exec.c
@@ -59,6 +59,8 @@
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
+
+#include <trace/events/task.h>
#include "internal.h"
int core_uses_pid;
@@ -1054,6 +1056,8 @@ void set_task_comm(struct task_struct *t
{
task_lock(tsk);
+ trace_task_rename(tsk, buf);
+
/*
* Threads may access current->comm without holding
* the task lock, so write the string carefully.
diff -puN fs/proc/base.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj fs/proc/base.c
--- a/fs/proc/base.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj
+++ a/fs/proc/base.c
@@ -86,6 +86,7 @@
#ifdef CONFIG_HARDWALL
#include <asm/hardwall.h>
#endif
+#include <trace/events/oom.h>
#include "internal.h"
/* NOTE:
@@ -1124,6 +1125,7 @@ static ssize_t oom_adjust_write(struct f
else
task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
-OOM_DISABLE;
+ trace_oom_score_adj_update(task);
err_sighand:
unlock_task_sighand(task, &flags);
err_task_lock:
@@ -1211,6 +1213,7 @@ static ssize_t oom_score_adj_write(struc
task->signal->oom_score_adj = oom_score_adj;
if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
task->signal->oom_score_adj_min = oom_score_adj;
+ trace_oom_score_adj_update(task);
/*
* Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
* always attainable.
diff -puN /dev/null include/trace/events/oom.h
--- /dev/null
+++ a/include/trace/events/oom.h
@@ -0,0 +1,35 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM oom
+
+#if !defined(_TRACE_OOM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_OOM_H
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(oom_score_adj_update,
+
+ TP_PROTO(struct task_struct *task),
+
+ TP_ARGS(task),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid)
+ __array( char, comm, TASK_COMM_LEN )
+ __field( int, oom_score_adj)
+ ),
+
+ TP_fast_assign(
+ __entry->pid = task->pid;
+ memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
+ __entry->oom_score_adj = task->signal->oom_score_adj;
+ ),
+
+ TP_printk("pid=%d comm=%s oom_score_adj=%d",
+ __entry->pid, __entry->comm, __entry->oom_score_adj)
+);
+
+#endif
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
+
+
diff -puN /dev/null include/trace/events/task.h
--- /dev/null
+++ a/include/trace/events/task.h
@@ -0,0 +1,63 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM task
+
+#if !defined(_TRACE_TASK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_TASK_H
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(task_newtask,
+
+ TP_PROTO(struct task_struct *task, unsigned long clone_flags),
+
+ TP_ARGS(task, clone_flags),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid)
+ __array( char, comm, TASK_COMM_LEN)
+ __field( unsigned long, clone_flags)
+ __field( int, oom_score_adj)
+ ),
+
+ TP_fast_assign(
+ __entry->pid = task->pid;
+ memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
+ __entry->clone_flags = clone_flags;
+ __entry->oom_score_adj = task->signal->oom_score_adj;
+ ),
+
+ TP_printk("pid=%d comm=%s clone_flags=%lx oom_score_adj=%d",
+ __entry->pid, __entry->comm,
+ __entry->clone_flags, __entry->oom_score_adj)
+);
+
+TRACE_EVENT(task_rename,
+
+ TP_PROTO(struct task_struct *task, char *comm),
+
+ TP_ARGS(task, comm),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid)
+ __array( char, oldcomm, TASK_COMM_LEN)
+ __array( char, newcomm, TASK_COMM_LEN)
+ __field( int, oom_score_adj)
+ ),
+
+ TP_fast_assign(
+ __entry->pid = task->pid;
+ memcpy(entry->oldcomm, task->comm, TASK_COMM_LEN);
+ memcpy(entry->newcomm, comm, TASK_COMM_LEN);
+ __entry->oom_score_adj = task->signal->oom_score_adj;
+ ),
+
+ TP_printk("pid=%d oldcomm=%s newcomm=%s oom_score_adj=%d",
+ __entry->pid, __entry->oldcomm,
+ __entry->newcomm, __entry->oom_score_adj)
+);
+
+#endif
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
+
+
diff -puN kernel/fork.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj kernel/fork.c
--- a/kernel/fork.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj
+++ a/kernel/fork.c
@@ -77,6 +77,9 @@
#include <trace/events/sched.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/task.h>
+
/*
* Protected counters by write_lock_irq(&tasklist_lock)
*/
@@ -1387,6 +1390,9 @@ static struct task_struct *copy_process(
if (clone_flags & CLONE_THREAD)
threadgroup_change_end(current);
perf_event_fork(p);
+
+ trace_task_newtask(p, clone_flags);
+
return p;
bad_fork_free_pid:
diff -puN mm/oom_kill.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj mm/oom_kill.c
--- a/mm/oom_kill.c~tracepoint-add-tracepoints-for-debugging-oom_score_adj
+++ a/mm/oom_kill.c
@@ -33,6 +33,10 @@
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/freezer.h>
+#include <linux/ftrace.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/oom.h>
int sysctl_panic_on_oom;
int sysctl_oom_kill_allocating_task;
@@ -55,6 +59,7 @@ void compare_swap_oom_score_adj(int old_
spin_lock_irq(&sighand->siglock);
if (current->signal->oom_score_adj == old_val)
current->signal->oom_score_adj = new_val;
+ trace_oom_score_adj_update(current);
spin_unlock_irq(&sighand->siglock);
}
@@ -74,6 +79,7 @@ int test_set_oom_score_adj(int new_val)
spin_lock_irq(&sighand->siglock);
old_val = current->signal->oom_score_adj;
current->signal->oom_score_adj = new_val;
+ trace_oom_score_adj_update(current);
spin_unlock_irq(&sighand->siglock);
return old_val;
_
Subject: Subject: tracepoint: add tracepoints for debugging oom_score_adj
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
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btrfs-pass-__gfp_write-for-buffered-write-page-allocations.patch
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tracepoint-add-tracepoints-for-debugging-oom_score_adj.patch
mm-memcg-consolidate-hierarchy-iteration-primitives.patch
mm-vmscan-distinguish-global-reclaim-from-global-lru-scanning.patch
mm-vmscan-distinguish-between-memcg-triggering-reclaim-and-memcg-being-scanned.patch
mm-memcg-per-priority-per-zone-hierarchy-scan-generations.patch
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mm-memcg-shorten-preempt-disabled-section-around-event-checks.patch
documentation-cgroups-memorytxt-fix-typo.patch
memcg-fix-pgpgin-pgpgout-documentation.patch
mm-oom_kill-remove-memcg-argument-from-oom_kill_task.patch
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