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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 11:40:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 11:40:25 -0700
commit1bc191051dca28fa6d20fd1dc34a1903e7d4fb62 (patch)
tree788fc5896c343ee3d84af7a2e3c6d78f5d55bca6 /kernel/trace/trace.c
parent20f463fb38686dd3fe7e6903cab56bdbbf756238 (diff)
parent795301d3c28996219d555023ac6863401b6076bc (diff)
Merge tag 'trace-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: - New user_events interface. User space can register an event with the kernel describing the format of the event. Then it will receive a byte in a page mapping that it can check against. A privileged task can then enable that event like any other event, which will change the mapped byte to true, telling the user space application to start writing the event to the tracing buffer. - Add new "ftrace_boot_snapshot" kernel command line parameter. When set, the tracing buffer will be saved in the snapshot buffer at boot up when the kernel hands things over to user space. This will keep the traces that happened at boot up available even if user space boot up has tracing as well. - Have TRACE_EVENT_ENUM() also update trace event field type descriptions. Thus if a static array defines its size with an enum, the user space trace event parsers can still know how to parse that array. - Add new TRACE_CUSTOM_EVENT() macro. This acts the same as the TRACE_EVENT() macro, but will attach to an existing tracepoint. This will make one tracepoint be able to trace different content and not be stuck at only what the original TRACE_EVENT() macro exports. - Fixes to tracing error logging. - Better saving of cmdlines to PIDs when tracing (use the wakeup events for mapping). * tag 'trace-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (30 commits) tracing: Have type enum modifications copy the strings user_events: Add trace event call as root for low permission cases tracing/user_events: Use alloc_pages instead of kzalloc() for register pages tracing: Add snapshot at end of kernel boot up tracing: Have TRACE_DEFINE_ENUM affect trace event types as well tracing: Fix strncpy warning in trace_events_synth.c user_events: Prevent dyn_event delete racing with ioctl add/delete tracing: Add TRACE_CUSTOM_EVENT() macro tracing: Move the defines to create TRACE_EVENTS into their own files tracing: Add sample code for custom trace events tracing: Allow custom events to be added to the tracefs directory tracing: Fix last_cmd_set() string management in histogram code user_events: Fix potential uninitialized pointer while parsing field tracing: Fix allocation of last_cmd in last_cmd_set() user_events: Add documentation file user_events: Add sample code for typical usage user_events: Add self-test for validator boundaries user_events: Add self-test for perf_event integration user_events: Add self-test for dynamic_events integration user_events: Add self-test for ftrace integration ...
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c73
1 files changed, 60 insertions, 13 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index eb44418574f9..08ea781540b5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -185,6 +185,7 @@ static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;
static char *default_bootup_tracer;
static bool allocate_snapshot;
+static bool snapshot_at_boot;
static int __init set_cmdline_ftrace(char *str)
{
@@ -230,6 +231,15 @@ static int __init boot_alloc_snapshot(char *str)
__setup("alloc_snapshot", boot_alloc_snapshot);
+static int __init boot_snapshot(char *str)
+{
+ snapshot_at_boot = true;
+ boot_alloc_snapshot(str);
+ return 1;
+}
+__setup("ftrace_boot_snapshot", boot_snapshot);
+
+
static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;
static int __init set_trace_boot_options(char *str)
@@ -7725,7 +7735,7 @@ const struct file_operations trace_min_max_fops = {
struct err_info {
const char **errs; /* ptr to loc-specific array of err strings */
u8 type; /* index into errs -> specific err string */
- u8 pos; /* MAX_FILTER_STR_VAL = 256 */
+ u16 pos; /* caret position */
u64 ts;
};
@@ -7733,26 +7743,52 @@ struct tracing_log_err {
struct list_head list;
struct err_info info;
char loc[TRACING_LOG_LOC_MAX]; /* err location */
- char cmd[MAX_FILTER_STR_VAL]; /* what caused err */
+ char *cmd; /* what caused err */
};
static DEFINE_MUTEX(tracing_err_log_lock);
-static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)
+static struct tracing_log_err *alloc_tracing_log_err(int len)
+{
+ struct tracing_log_err *err;
+
+ err = kzalloc(sizeof(*err), GFP_KERNEL);
+ if (!err)
+ return ERR_PTR(-ENOMEM);
+
+ err->cmd = kzalloc(len, GFP_KERNEL);
+ if (!err->cmd) {
+ kfree(err);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return err;
+}
+
+static void free_tracing_log_err(struct tracing_log_err *err)
+{
+ kfree(err->cmd);
+ kfree(err);
+}
+
+static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr,
+ int len)
{
struct tracing_log_err *err;
if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) {
- err = kzalloc(sizeof(*err), GFP_KERNEL);
- if (!err)
- err = ERR_PTR(-ENOMEM);
- else
+ err = alloc_tracing_log_err(len);
+ if (PTR_ERR(err) != -ENOMEM)
tr->n_err_log_entries++;
return err;
}
err = list_first_entry(&tr->err_log, struct tracing_log_err, list);
+ kfree(err->cmd);
+ err->cmd = kzalloc(len, GFP_KERNEL);
+ if (!err->cmd)
+ return ERR_PTR(-ENOMEM);
list_del(&err->list);
return err;
@@ -7813,22 +7849,25 @@ unsigned int err_pos(char *cmd, const char *str)
*/
void tracing_log_err(struct trace_array *tr,
const char *loc, const char *cmd,
- const char **errs, u8 type, u8 pos)
+ const char **errs, u8 type, u16 pos)
{
struct tracing_log_err *err;
+ int len = 0;
if (!tr)
tr = &global_trace;
+ len += sizeof(CMD_PREFIX) + 2 * sizeof("\n") + strlen(cmd) + 1;
+
mutex_lock(&tracing_err_log_lock);
- err = get_tracing_log_err(tr);
+ err = get_tracing_log_err(tr, len);
if (PTR_ERR(err) == -ENOMEM) {
mutex_unlock(&tracing_err_log_lock);
return;
}
snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc);
- snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd);
+ snprintf(err->cmd, len, "\n" CMD_PREFIX "%s\n", cmd);
err->info.errs = errs;
err->info.type = type;
@@ -7846,7 +7885,7 @@ static void clear_tracing_err_log(struct trace_array *tr)
mutex_lock(&tracing_err_log_lock);
list_for_each_entry_safe(err, next, &tr->err_log, list) {
list_del(&err->list);
- kfree(err);
+ free_tracing_log_err(err);
}
tr->n_err_log_entries = 0;
@@ -7874,9 +7913,9 @@ static void tracing_err_log_seq_stop(struct seq_file *m, void *v)
mutex_unlock(&tracing_err_log_lock);
}
-static void tracing_err_log_show_pos(struct seq_file *m, u8 pos)
+static void tracing_err_log_show_pos(struct seq_file *m, u16 pos)
{
- u8 i;
+ u16 i;
for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++)
seq_putc(m, ' ');
@@ -10122,6 +10161,14 @@ out:
return ret;
}
+void __init ftrace_boot_snapshot(void)
+{
+ if (snapshot_at_boot) {
+ tracing_snapshot();
+ internal_trace_puts("** Boot snapshot taken **\n");
+ }
+}
+
void __init early_trace_init(void)
{
if (tracepoint_printk) {