* [PATCH -tip v4 0/3] tracepoint: Add signal events
@ 2009-11-24 21:53 Masami Hiramatsu
2009-11-24 21:53 ` [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
` (3 more replies)
0 siblings, 4 replies; 8+ messages in thread
From: Masami Hiramatsu @ 2009-11-24 21:53 UTC (permalink / raw)
To: Ingo Molnar, lkml
Cc: Roland McGrath, Oleg Nesterov, Jason Baron, Jason Baron,
Roland McGrath, systemtap, DLE
Hi,
These patches add signal related tracepoints including
signal generation, delivery, and loss. First patch also
moves signal-sending tracepoint from events/sched.h to
events/signal.h.
Changes in v4
- Fix typo of task_struct pointer
Changes in v3
- Add Docbook style comments
Changes in v2
- Add siginfo arguments
Thank you,
---
Masami Hiramatsu (3):
tracepoint: Add signal loss events
tracepoint: Add signal deliver event
tracepoint: Move signal sending tracepoint to events/signal.h
Documentation/DocBook/tracepoint.tmpl | 5 +
include/trace/events/sched.h | 25 -----
include/trace/events/signal.h | 173 +++++++++++++++++++++++++++++++++
kernel/signal.c | 27 ++++-
4 files changed, 198 insertions(+), 32 deletions(-)
create mode 100644 include/trace/events/signal.h
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h
2009-11-24 21:53 [PATCH -tip v4 0/3] tracepoint: Add signal events Masami Hiramatsu
@ 2009-11-24 21:53 ` Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 21:54 ` [PATCH -tip v4 3/3] tracepoint: Add signal loss events Masami Hiramatsu
` (2 subsequent siblings)
3 siblings, 1 reply; 8+ messages in thread
From: Masami Hiramatsu @ 2009-11-24 21:53 UTC (permalink / raw)
To: Ingo Molnar, lkml
Cc: Jason Baron, Roland McGrath, systemtap, DLE, Masami Hiramatsu,
Oleg Nesterov, Roland McGrath, Ingo Molnar
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>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
---
Documentation/DocBook/tracepoint.tmpl | 5 +++
include/trace/events/sched.h | 25 -------------
include/trace/events/signal.h | 66 +++++++++++++++++++++++++++++++++
kernel/signal.c | 5 ++-
4 files changed, 74 insertions(+), 27 deletions(-)
create mode 100644 include/trace/events/signal.h
diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl
index b0756d0..8bca1d5 100644
--- a/Documentation/DocBook/tracepoint.tmpl
+++ b/Documentation/DocBook/tracepoint.tmpl
@@ -86,4 +86,9 @@
!Iinclude/trace/events/irq.h
</chapter>
+ <chapter id="signal">
+ <title>SIGNAL</title>
+!Iinclude/trace/events/signal.h
+ </chapter>
+
</book>
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index b50b985..b221bb3 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -320,31 +320,6 @@ TRACE_EVENT(sched_process_fork,
);
/*
- * 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.
*/
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
new file mode 100644
index 0000000..ef51756
--- /dev/null
+++ b/include/trace/events/signal.h
@@ -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>
diff --git a/kernel/signal.c b/kernel/signal.c
index fe08008..54ac4c5 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -28,7 +28,8 @@
#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>
@@ -856,7 +857,7 @@ 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);
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH -tip v4 2/3] tracepoint: Add signal deliver event
2009-11-24 21:53 [PATCH -tip v4 0/3] tracepoint: Add signal events Masami Hiramatsu
2009-11-24 21:53 ` [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
2009-11-24 21:54 ` [PATCH -tip v4 3/3] tracepoint: Add signal loss events Masami Hiramatsu
@ 2009-11-24 21:54 ` Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 22:12 ` [PATCH -tip v4 0/3] tracepoint: Add signal events Roland McGrath
3 siblings, 1 reply; 8+ messages in thread
From: Masami Hiramatsu @ 2009-11-24 21:54 UTC (permalink / raw)
To: Ingo Molnar, lkml
Cc: Jason Baron, Roland McGrath, systemtap, DLE, Masami Hiramatsu,
Oleg Nesterov, Roland McGrath, Ingo Molnar
Add a tracepoint where a process gets a signal. This tracepoint
shows signal-number, sa-handler and sa-flag.
Changes in v3:
- Add docbook style comments
Changes in v2:
- Add siginfo argument
- Fix comment
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
---
include/trace/events/signal.h | 39 +++++++++++++++++++++++++++++++++++++++
kernel/signal.c | 3 +++
2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index ef51756..a6d71de 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -60,6 +60,45 @@ TRACE_EVENT(signal_generate,
__entry->comm, __entry->pid)
);
+/**
+ * signal_deliver - called when a signal is delivered
+ * @sig: signal number
+ * @info: pointer to struct siginfo
+ * @ka: pointer to struct k_sigaction
+ *
+ * A 'sig' signal is delivered to current process with 'info' siginfo,
+ * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
+ * SIG_DFL.
+ * Note that some signals reported by signal_generate tracepoint can be
+ * lost, ignored or modified (by debugger) before hitting this tracepoint.
+ * This means, this can show which signals are actually delivered, but
+ * matching generated signals and delivered signals may not be correct.
+ */
+TRACE_EVENT(signal_deliver,
+
+ TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
+
+ TP_ARGS(sig, info, ka),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, errno )
+ __field( int, code )
+ __field( unsigned long, sa_handler )
+ __field( unsigned long, sa_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ TP_STORE_SIGINFO(__entry, info);
+ __entry->sa_handler = (unsigned long)ka->sa.sa_handler;
+ __entry->sa_flags = ka->sa.sa_flags;
+ ),
+
+ TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
+ __entry->sig, __entry->errno, __entry->code,
+ __entry->sa_handler, __entry->sa_flags)
+);
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
diff --git a/kernel/signal.c b/kernel/signal.c
index 54ac4c5..d518984 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1860,6 +1860,9 @@ relock:
ka = &sighand->action[signr-1];
}
+ /* Trace actually delivered signals. */
+ trace_signal_deliver(signr, info, ka);
+
if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */
continue;
if (ka->sa.sa_handler != SIG_DFL) {
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH -tip v4 3/3] tracepoint: Add signal loss events
2009-11-24 21:53 [PATCH -tip v4 0/3] tracepoint: Add signal events Masami Hiramatsu
2009-11-24 21:53 ` [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
@ 2009-11-24 21:54 ` Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 21:54 ` [PATCH -tip v4 2/3] tracepoint: Add signal deliver event Masami Hiramatsu
2009-11-24 22:12 ` [PATCH -tip v4 0/3] tracepoint: Add signal events Roland McGrath
3 siblings, 1 reply; 8+ messages in thread
From: Masami Hiramatsu @ 2009-11-24 21:54 UTC (permalink / raw)
To: Ingo Molnar, lkml
Cc: Jason Baron, Roland McGrath, systemtap, DLE, Masami Hiramatsu,
Oleg Nesterov, Ingo Molnar
Add signal_overflow_fail and signal_lose_info tracepoints
for signal-lost events.
Changes in v3:
- Add docbook style comments
Changes in v2:
- Use siginfo string macro
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Suggested-by: Roland McGrath <roland@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
---
include/trace/events/signal.h | 68 +++++++++++++++++++++++++++++++++++++++++
kernel/signal.c | 19 ++++++++---
2 files changed, 82 insertions(+), 5 deletions(-)
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index a6d71de..a510b75 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -99,6 +99,74 @@ TRACE_EVENT(signal_deliver,
__entry->sig, __entry->errno, __entry->code,
__entry->sa_handler, __entry->sa_flags)
);
+
+/**
+ * signal_overflow_fail - called when signal queue is overflow
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel fails to generate 'sig' signal with 'info' siginfo, because
+ * siginfo queue is overflow, and the signal is dropped.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of RT signals.
+ */
+TRACE_EVENT(signal_overflow_fail,
+
+ TP_PROTO(int sig, int group, struct siginfo *info),
+
+ TP_ARGS(sig, group, info),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, group )
+ __field( int, errno )
+ __field( int, code )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ __entry->group = group;
+ TP_STORE_SIGINFO(__entry, info);
+ ),
+
+ TP_printk("sig=%d group=%d errno=%d code=%d",
+ __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
+
+/**
+ * signal_lose_info - called when siginfo is lost
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
+ * queue is overflow.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of non-RT signals.
+ */
+TRACE_EVENT(signal_lose_info,
+
+ TP_PROTO(int sig, int group, struct siginfo *info),
+
+ TP_ARGS(sig, group, info),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, group )
+ __field( int, errno )
+ __field( int, code )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ __entry->group = group;
+ TP_STORE_SIGINFO(__entry, info);
+ ),
+
+ TP_printk("sig=%d group=%d errno=%d code=%d",
+ __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
diff --git a/kernel/signal.c b/kernel/signal.c
index d518984..6b982f2 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -919,12 +919,21 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
}
} else if (!is_si_special(info)) {
- if (sig >= SIGRTMIN && info->si_code != SI_USER)
- /*
- * Queue overflow, abort. We may abort if the signal was rt
- * and sent by user using something other than kill().
- */
+ if (sig >= SIGRTMIN && info->si_code != SI_USER) {
+ /*
+ * Queue overflow, abort. We may abort if the
+ * signal was rt and sent by user using something
+ * other than kill().
+ */
+ trace_signal_overflow_fail(sig, group, info);
return -EAGAIN;
+ } else {
+ /*
+ * This is a silent loss of information. We still
+ * send the signal, but the *info bits are lost.
+ */
+ trace_signal_lose_info(sig, group, info);
+ }
}
out_set:
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH -tip v4 0/3] tracepoint: Add signal events
2009-11-24 21:53 [PATCH -tip v4 0/3] tracepoint: Add signal events Masami Hiramatsu
` (2 preceding siblings ...)
2009-11-24 21:54 ` [PATCH -tip v4 2/3] tracepoint: Add signal deliver event Masami Hiramatsu
@ 2009-11-24 22:12 ` Roland McGrath
3 siblings, 0 replies; 8+ messages in thread
From: Roland McGrath @ 2009-11-24 22:12 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Ingo Molnar, lkml, Oleg Nesterov, Jason Baron, systemtap, DLE
Acked-by: Roland McGrath <roland@redhat.com>
There might be some more refinements that are worthwhile, but these look
like a sensible and clean enough set of tracepoints to start with. If we
need to change them, that will become clear from the experiences of people
actually using these.
Thanks,
Roland
^ permalink raw reply [flat|nested] 8+ messages in thread
* [tip:perf/core] tracepoint: Move signal sending tracepoint to events/signal.h
2009-11-24 21:53 ` [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
@ 2009-11-26 10:27 ` tip-bot for Masami Hiramatsu
0 siblings, 0 replies; 8+ messages in thread
From: tip-bot for Masami Hiramatsu @ 2009-11-26 10:27 UTC (permalink / raw)
To: linux-tip-commits
Cc: linux-kernel, hpa, mingo, roland, dle-develop, oleg, tglx,
jbaron, mhiramat, mingo, systemtap
Commit-ID: d1eb650ff4130972fa21462fa49cd35a2865403b
Gitweb: http://git.kernel.org/tip/d1eb650ff4130972fa21462fa49cd35a2865403b
Author: Masami Hiramatsu <mhiramat@redhat.com>
AuthorDate: Tue, 24 Nov 2009 16:56:45 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 26 Nov 2009 10:55:37 +0100
tracepoint: Move signal sending tracepoint to events/signal.h
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>
---
Documentation/DocBook/tracepoint.tmpl | 5 ++
include/trace/events/sched.h | 25 ------------
include/trace/events/signal.h | 66 +++++++++++++++++++++++++++++++++
kernel/signal.c | 5 +-
4 files changed, 74 insertions(+), 27 deletions(-)
diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl
index b0756d0..8bca1d5 100644
--- a/Documentation/DocBook/tracepoint.tmpl
+++ b/Documentation/DocBook/tracepoint.tmpl
@@ -86,4 +86,9 @@
!Iinclude/trace/events/irq.h
</chapter>
+ <chapter id="signal">
+ <title>SIGNAL</title>
+!Iinclude/trace/events/signal.h
+ </chapter>
+
</book>
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9d316b2..cfceb0b 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -288,31 +288,6 @@ TRACE_EVENT(sched_process_fork,
);
/*
- * 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.
*/
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
new file mode 100644
index 0000000..ef51756
--- /dev/null
+++ b/include/trace/events/signal.h
@@ -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>
diff --git a/kernel/signal.c b/kernel/signal.c
index 6705320..a1e0cc6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -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);
^ permalink raw reply [flat|nested] 8+ messages in thread
* [tip:perf/core] tracepoint: Add signal loss events
2009-11-24 21:54 ` [PATCH -tip v4 3/3] tracepoint: Add signal loss events Masami Hiramatsu
@ 2009-11-26 10:27 ` tip-bot for Masami Hiramatsu
0 siblings, 0 replies; 8+ messages in thread
From: tip-bot for Masami Hiramatsu @ 2009-11-26 10:27 UTC (permalink / raw)
To: linux-tip-commits
Cc: linux-kernel, hpa, mingo, roland, dle-develop, oleg, tglx,
jbaron, mhiramat, mingo, systemtap
Commit-ID: ba005e1f417295d28cd1563ab82bc33af07fb16a
Gitweb: http://git.kernel.org/tip/ba005e1f417295d28cd1563ab82bc33af07fb16a
Author: Masami Hiramatsu <mhiramat@redhat.com>
AuthorDate: Tue, 24 Nov 2009 16:56:58 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 26 Nov 2009 10:55:38 +0100
tracepoint: Add signal loss events
Add signal_overflow_fail and signal_lose_info tracepoints
for signal-lost events.
Changes in v3:
- Add docbook style comments
Changes in v2:
- Use siginfo string macro
Suggested-by: Roland McGrath <roland@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@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: <20091124215658.30449.9934.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
include/trace/events/signal.h | 68 +++++++++++++++++++++++++++++++++++++++++
kernel/signal.c | 19 ++++++++---
2 files changed, 82 insertions(+), 5 deletions(-)
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index a6d71de..a510b75 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -99,6 +99,74 @@ TRACE_EVENT(signal_deliver,
__entry->sig, __entry->errno, __entry->code,
__entry->sa_handler, __entry->sa_flags)
);
+
+/**
+ * signal_overflow_fail - called when signal queue is overflow
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel fails to generate 'sig' signal with 'info' siginfo, because
+ * siginfo queue is overflow, and the signal is dropped.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of RT signals.
+ */
+TRACE_EVENT(signal_overflow_fail,
+
+ TP_PROTO(int sig, int group, struct siginfo *info),
+
+ TP_ARGS(sig, group, info),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, group )
+ __field( int, errno )
+ __field( int, code )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ __entry->group = group;
+ TP_STORE_SIGINFO(__entry, info);
+ ),
+
+ TP_printk("sig=%d group=%d errno=%d code=%d",
+ __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
+
+/**
+ * signal_lose_info - called when siginfo is lost
+ * @sig: signal number
+ * @group: signal to process group or not (bool)
+ * @info: pointer to struct siginfo
+ *
+ * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
+ * queue is overflow.
+ * 'group' is not 0 if the signal will be sent to a process group.
+ * 'sig' is always one of non-RT signals.
+ */
+TRACE_EVENT(signal_lose_info,
+
+ TP_PROTO(int sig, int group, struct siginfo *info),
+
+ TP_ARGS(sig, group, info),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, group )
+ __field( int, errno )
+ __field( int, code )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ __entry->group = group;
+ TP_STORE_SIGINFO(__entry, info);
+ ),
+
+ TP_printk("sig=%d group=%d errno=%d code=%d",
+ __entry->sig, __entry->group, __entry->errno, __entry->code)
+);
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
diff --git a/kernel/signal.c b/kernel/signal.c
index 349d449..93e72e5 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -897,12 +897,21 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
}
} else if (!is_si_special(info)) {
- if (sig >= SIGRTMIN && info->si_code != SI_USER)
- /*
- * Queue overflow, abort. We may abort if the signal was rt
- * and sent by user using something other than kill().
- */
+ if (sig >= SIGRTMIN && info->si_code != SI_USER) {
+ /*
+ * Queue overflow, abort. We may abort if the
+ * signal was rt and sent by user using something
+ * other than kill().
+ */
+ trace_signal_overflow_fail(sig, group, info);
return -EAGAIN;
+ } else {
+ /*
+ * This is a silent loss of information. We still
+ * send the signal, but the *info bits are lost.
+ */
+ trace_signal_lose_info(sig, group, info);
+ }
}
out_set:
^ permalink raw reply [flat|nested] 8+ messages in thread
* [tip:perf/core] tracepoint: Add signal deliver event
2009-11-24 21:54 ` [PATCH -tip v4 2/3] tracepoint: Add signal deliver event Masami Hiramatsu
@ 2009-11-26 10:27 ` tip-bot for Masami Hiramatsu
0 siblings, 0 replies; 8+ messages in thread
From: tip-bot for Masami Hiramatsu @ 2009-11-26 10:27 UTC (permalink / raw)
To: linux-tip-commits
Cc: linux-kernel, hpa, mingo, roland, dle-develop, oleg, tglx,
jbaron, mhiramat, mingo, systemtap
Commit-ID: f9d4257e01d266e67420cc99d456b6d4c8464f54
Gitweb: http://git.kernel.org/tip/f9d4257e01d266e67420cc99d456b6d4c8464f54
Author: Masami Hiramatsu <mhiramat@redhat.com>
AuthorDate: Tue, 24 Nov 2009 16:56:51 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 26 Nov 2009 10:55:38 +0100
tracepoint: Add signal deliver event
Add a tracepoint where a process gets a signal. This tracepoint
shows signal-number, sa-handler and sa-flag.
Changes in v3:
- Add docbook style comments
Changes in v2:
- Add siginfo argument
- Fix comment
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: <20091124215651.30449.20926.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
include/trace/events/signal.h | 39 +++++++++++++++++++++++++++++++++++++++
kernel/signal.c | 3 +++
2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
index ef51756..a6d71de 100644
--- a/include/trace/events/signal.h
+++ b/include/trace/events/signal.h
@@ -60,6 +60,45 @@ TRACE_EVENT(signal_generate,
__entry->comm, __entry->pid)
);
+/**
+ * signal_deliver - called when a signal is delivered
+ * @sig: signal number
+ * @info: pointer to struct siginfo
+ * @ka: pointer to struct k_sigaction
+ *
+ * A 'sig' signal is delivered to current process with 'info' siginfo,
+ * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
+ * SIG_DFL.
+ * Note that some signals reported by signal_generate tracepoint can be
+ * lost, ignored or modified (by debugger) before hitting this tracepoint.
+ * This means, this can show which signals are actually delivered, but
+ * matching generated signals and delivered signals may not be correct.
+ */
+TRACE_EVENT(signal_deliver,
+
+ TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
+
+ TP_ARGS(sig, info, ka),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( int, errno )
+ __field( int, code )
+ __field( unsigned long, sa_handler )
+ __field( unsigned long, sa_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ TP_STORE_SIGINFO(__entry, info);
+ __entry->sa_handler = (unsigned long)ka->sa.sa_handler;
+ __entry->sa_flags = ka->sa.sa_flags;
+ ),
+
+ TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
+ __entry->sig, __entry->errno, __entry->code,
+ __entry->sa_handler, __entry->sa_flags)
+);
#endif /* _TRACE_SIGNAL_H */
/* This part must be outside protection */
diff --git a/kernel/signal.c b/kernel/signal.c
index a1e0cc6..349d449 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1840,6 +1840,9 @@ relock:
ka = &sighand->action[signr-1];
}
+ /* Trace actually delivered signals. */
+ trace_signal_deliver(signr, info, ka);
+
if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */
continue;
if (ka->sa.sa_handler != SIG_DFL) {
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2009-11-26 10:27 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-11-24 21:53 [PATCH -tip v4 0/3] tracepoint: Add signal events Masami Hiramatsu
2009-11-24 21:53 ` [PATCH -tip v4 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 21:54 ` [PATCH -tip v4 3/3] tracepoint: Add signal loss events Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 21:54 ` [PATCH -tip v4 2/3] tracepoint: Add signal deliver event Masami Hiramatsu
2009-11-26 10:27 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2009-11-24 22:12 ` [PATCH -tip v4 0/3] tracepoint: Add signal events Roland McGrath
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