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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>
33 lines
715 B
C
33 lines
715 B
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM oom
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#if !defined(_TRACE_OOM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_OOM_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(oom_score_adj_update,
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TP_PROTO(struct task_struct *task),
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TP_ARGS(task),
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TP_STRUCT__entry(
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__field( pid_t, pid)
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__array( char, comm, TASK_COMM_LEN )
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__field( int, oom_score_adj)
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),
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TP_fast_assign(
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__entry->pid = task->pid;
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memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
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__entry->oom_score_adj = task->signal->oom_score_adj;
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),
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TP_printk("pid=%d comm=%s oom_score_adj=%d",
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__entry->pid, __entry->comm, __entry->oom_score_adj)
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);
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#endif
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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