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[3.145.129.179]) by smtp.googlemail.com with ESMTPSA id m13-20020a026a4d000000b0034161ed8fadsm4092988jaf.150.2022.07.24.02.11.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Jul 2022 02:11:24 -0700 (PDT) From: Jianlin Lv To: rostedt@goodmis.org, mingo@redhat.com Cc: iecedge@gmail.com, jianlv@ebay.com, linux-kernel@vger.kernel.org Subject: [PATCH] tracing/kprobe: Add tracefs to show private kprobe Date: Sun, 24 Jul 2022 09:10:50 +0000 Message-Id: <20220724091050.12711-1-iecedge@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" List private kprobe event to new created local_event_list; Add tracefs file kprobe_local_profile to show events which in local_event_list. Signed-off-by: Jianlin Lv --- kernel/trace/trace_dynevent.c | 18 +++++++++++++ kernel/trace/trace_dynevent.h | 33 +++++++++++++++++++++++ kernel/trace/trace_kprobe.c | 50 +++++++++++++++++++++++++++++++++++ 3 files changed, 101 insertions(+) diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c index 076b447a1b88..8411104ad6d8 100644 --- a/kernel/trace/trace_dynevent.c +++ b/kernel/trace/trace_dynevent.c @@ -181,6 +181,24 @@ static const struct seq_operations dyn_event_seq_op = =3D { .show =3D dyn_event_seq_show }; =20 +LIST_HEAD(local_event_list); + +void *local_event_seq_start(struct seq_file *m, loff_t *pos) +{ + mutex_lock(&event_mutex); + return seq_list_start(&local_event_list, *pos); +} + +void *local_event_seq_next(struct seq_file *m, void *v, loff_t *pos) +{ + return seq_list_next(v, &local_event_list, pos); +} + +void local_event_seq_stop(struct seq_file *m, void *v) +{ + mutex_unlock(&event_mutex); +} + /* * dyn_events_release_all - Release all specific events * @type: the dyn_event_operations * which filters releasing events diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h index 936477a111d3..e6413969f9ed 100644 --- a/kernel/trace/trace_dynevent.h +++ b/kernel/trace/trace_dynevent.h @@ -64,6 +64,7 @@ struct dyn_event { }; =20 extern struct list_head dyn_event_list; +extern struct list_head local_event_list; =20 static inline int dyn_event_init(struct dyn_event *ev, struct dyn_event_operations *ops) @@ -95,12 +96,44 @@ static inline void dyn_event_remove(struct dyn_event *e= v) list_del_init(&ev->list); } =20 +static inline +int local_event_init(struct dyn_event *ev, struct dyn_event_operations *op= s) +{ + if (!ev || !ops) + return -EINVAL; + + INIT_LIST_HEAD(&ev->list); + ev->ops =3D ops; + return 0; +} + +static inline int local_event_add(struct dyn_event *ev) +{ + lockdep_assert_held(&event_mutex); + + if (!ev || !ev->ops) + return -EINVAL; + + list_add_tail(&ev->list, &local_event_list); + return 0; +} + +static inline void local_event_remove(struct dyn_event *ev) +{ + lockdep_assert_held(&event_mutex); + list_del_init(&ev->list); +} + void *dyn_event_seq_start(struct seq_file *m, loff_t *pos); void *dyn_event_seq_next(struct seq_file *m, void *v, loff_t *pos); void dyn_event_seq_stop(struct seq_file *m, void *v); int dyn_events_release_all(struct dyn_event_operations *type); int dyn_event_release(const char *raw_command, struct dyn_event_operations= *type); =20 +void *local_event_seq_start(struct seq_file *m, loff_t *pos); +void *local_event_seq_next(struct seq_file *m, void *v, loff_t *pos); +void local_event_seq_stop(struct seq_file *m, void *v); + /* * for_each_dyn_event - iterate over the dyn_event list * @pos: the struct dyn_event * to use as a loop cursor diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index a245ea673715..8fd39033d2ba 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1213,6 +1213,50 @@ static const struct file_operations kprobe_profile_o= ps =3D { .release =3D seq_release, }; =20 +/* kprobe Local profile */ +static int local_probes_profile_seq_show(struct seq_file *m, void *v) +{ + struct dyn_event *ev =3D v; + struct trace_kprobe *tk; + + if (!is_trace_kprobe(ev)) + return 0; + + tk =3D to_trace_kprobe(ev); + seq_printf(m, " %-44s %15lu %15lu\n", + trace_probe_name(&tk->tp), + trace_kprobe_nhit(tk), + tk->rp.kp.nmissed); + + return 0; +} + +static const struct seq_operations local_profile_seq_op =3D { + .start =3D local_event_seq_start, + .next =3D local_event_seq_next, + .stop =3D local_event_seq_stop, + .show =3D local_probes_profile_seq_show +}; + +static int local_profile_open(struct inode *inode, struct file *file) +{ + int ret; + + ret =3D security_locked_down(LOCKDOWN_TRACEFS); + if (ret) + return ret; + + return seq_open(file, &local_profile_seq_op); +} + +static const struct file_operations kprobe_local_profile_ops =3D { + .owner =3D THIS_MODULE, + .open =3D local_profile_open, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D seq_release, +}; + /* Kprobe specific fetch functions */ =20 /* Return the length of string -- including null terminal byte */ @@ -1830,6 +1874,7 @@ create_local_trace_kprobe(char *func, void *addr, uns= igned long offs, if (ret < 0) goto error; =20 + local_event_add(&tk->devent); return trace_probe_event_call(&tk->tp); error: free_trace_kprobe(tk); @@ -1849,6 +1894,7 @@ void destroy_local_trace_kprobe(struct trace_event_ca= ll *event_call) return; } =20 + local_event_remove(&tk->devent); __unregister_trace_kprobe(tk); =20 free_trace_kprobe(tk); @@ -1929,6 +1975,10 @@ static __init int init_kprobe_trace(void) trace_create_file("kprobe_profile", TRACE_MODE_READ, NULL, NULL, &kprobe_profile_ops); =20 + /* kprobe Local profile */ + tracefs_create_file("kprobe_local_profile", TRACE_MODE_READ, + NULL, NULL, &kprobe_local_profile_ops); + setup_boot_kprobe_events(); =20 return 0; --=20 2.25.1