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tracepoint: Move signal sending tracepoint to events/signal.h

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Move signal sending event to events/signal.h. This patch also
renames sched_signal_send event to signal_generate.

Changes in v4:
 - Fix a typo of task_struct pointer.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Add siginfo argument
 - Add siginfo storing macro

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215645.30449.60208.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-11-24 16:56:45 -05:00 committed by Ingo Molnar
parent 80bbf6b641
commit d1eb650ff4
4 changed files with 74 additions and 27 deletions
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5
Documentation/DocBook/tracepoint.tmpl
View File

@ -86,4 +86,9 @@
!Iinclude/trace/events/irq.h
</chapter>
<chapter id="signal">
<title>SIGNAL</title>
!Iinclude/trace/events/signal.h
</chapter>
</book>

25
include/trace/events/sched.h
View File

@ -287,31 +287,6 @@ TRACE_EVENT(sched_process_fork,
__entry->child_comm, __entry->child_pid)
);
/*
* Tracepoint for sending a signal:
*/
TRACE_EVENT(sched_signal_send,
TP_PROTO(int sig, struct task_struct *p),
TP_ARGS(sig, p),
TP_STRUCT__entry(
__field( int, sig )
__array( char, comm, TASK_COMM_LEN )
__field( pid_t, pid )
),
TP_fast_assign(
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->sig = sig;
),
TP_printk("sig=%d comm=%s pid=%d",
__entry->sig, __entry->comm, __entry->pid)
);
/*
* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
* adding sched_stat support to SCHED_FIFO/RR would be welcome.

66
include/trace/events/signal.h Normal file
View File

@ -0,0 +1,66 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM signal
#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SIGNAL_H
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/tracepoint.h>
#define TP_STORE_SIGINFO(__entry, info) \
do { \
if (info == SEND_SIG_NOINFO) { \
__entry->errno = 0; \
__entry->code = SI_USER; \
} else if (info == SEND_SIG_PRIV) { \
__entry->errno = 0; \
__entry->code = SI_KERNEL; \
} else { \
__entry->errno = info->si_errno; \
__entry->code = info->si_code; \
} \
} while (0)
/**
* signal_generate - called when a signal is generated
* @sig: signal number
* @info: pointer to struct siginfo
* @task: pointer to struct task_struct
*
* Current process sends a 'sig' signal to 'task' process with
* 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
* 'info' is not a pointer and you can't access its field. Instead,
* SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
* means that si_code is SI_KERNEL.
*/
TRACE_EVENT(signal_generate,
TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
TP_ARGS(sig, info, task),
TP_STRUCT__entry(
__field( int, sig )
__field( int, errno )
__field( int, code )
__array( char, comm, TASK_COMM_LEN )
__field( pid_t, pid )
),
TP_fast_assign(
__entry->sig = sig;
TP_STORE_SIGINFO(__entry, info);
memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
__entry->pid = task->pid;
),
TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
__entry->sig, __entry->errno, __entry->code,
__entry->comm, __entry->pid)
);
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

5
kernel/signal.c
View File

@ -27,7 +27,8 @@
#include <linux/freezer.h>
#include <linux/pid_namespace.h>
#include <linux/nsproxy.h>
#include <trace/events/sched.h>
#define CREATE_TRACE_POINTS
#include <trace/events/signal.h>
#include <asm/param.h>
#include <asm/uaccess.h>
@ -834,7 +835,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
struct sigqueue *q;
int override_rlimit;
trace_sched_signal_send(sig, t);
trace_signal_generate(sig, info, t);
assert_spin_locked(&t->sighand->siglock);