43d2b11324
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@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
#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>
|