diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 82 |
1 files changed, 74 insertions, 8 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 51612b4a603f..c521b7347482 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1431,7 +1431,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) } #endif /* CONFIG_TRACER_MAX_TRACE */ -static int wait_on_pipe(struct trace_iterator *iter, bool full) +static int wait_on_pipe(struct trace_iterator *iter, int full) { /* Iterators are static, they should be filled or empty */ if (trace_buffer_iter(iter, iter->cpu_file)) @@ -2452,7 +2452,7 @@ static inline void ftrace_exports_disable(void) static_branch_disable(&ftrace_exports_enabled); } -void ftrace_exports(struct ring_buffer_event *event) +static void ftrace_exports(struct ring_buffer_event *event) { struct trace_export *export; @@ -4408,13 +4408,15 @@ static int trace_set_options(struct trace_array *tr, char *option) int neg = 0; int ret; size_t orig_len = strlen(option); + int len; cmp = strstrip(option); - if (strncmp(cmp, "no", 2) == 0) { + len = str_has_prefix(cmp, "no"); + if (len) neg = 1; - cmp += 2; - } + + cmp += len; mutex_lock(&trace_types_lock); @@ -4604,6 +4606,10 @@ static const char readme_msg[] = "\t\t\t traces\n" #endif #endif /* CONFIG_STACK_TRACER */ +#ifdef CONFIG_DYNAMIC_EVENTS + " dynamic_events\t\t- Add/remove/show the generic dynamic events\n" + "\t\t\t Write into this file to define/undefine new trace events.\n" +#endif #ifdef CONFIG_KPROBE_EVENTS " kprobe_events\t\t- Add/remove/show the kernel dynamic events\n" "\t\t\t Write into this file to define/undefine new trace events.\n" @@ -4616,6 +4622,9 @@ static const char readme_msg[] = "\t accepts: event-definitions (one definition per line)\n" "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" +#ifdef CONFIG_HIST_TRIGGERS + "\t s:[synthetic/]<event> <field> [<field>]\n" +#endif "\t -:[<group>/]<event>\n" #ifdef CONFIG_KPROBE_EVENTS "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" @@ -4634,6 +4643,11 @@ static const char readme_msg[] = "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" "\t b<bit-width>@<bit-offset>/<container-size>,\n" "\t <type>\\[<array-size>\\]\n" +#ifdef CONFIG_HIST_TRIGGERS + "\t field: <stype> <name>;\n" + "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n" + "\t [unsigned] char/int/long\n" +#endif #endif " events/\t\t- Directory containing all trace event subsystems:\n" " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" @@ -5693,7 +5707,7 @@ static int tracing_wait_pipe(struct file *filp) mutex_unlock(&iter->mutex); - ret = wait_on_pipe(iter, false); + ret = wait_on_pipe(iter, 0); mutex_lock(&iter->mutex); @@ -6751,7 +6765,7 @@ tracing_buffers_read(struct file *filp, char __user *ubuf, if ((filp->f_flags & O_NONBLOCK)) return -EAGAIN; - ret = wait_on_pipe(iter, false); + ret = wait_on_pipe(iter, 0); if (ret) return ret; @@ -6948,7 +6962,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) goto out; - ret = wait_on_pipe(iter, true); + ret = wait_on_pipe(iter, iter->tr->buffer_percent); if (ret) goto out; @@ -7662,6 +7676,53 @@ static const struct file_operations rb_simple_fops = { .llseek = default_llseek, }; +static ssize_t +buffer_percent_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = filp->private_data; + char buf[64]; + int r; + + r = tr->buffer_percent; + r = sprintf(buf, "%d\n", r); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); +} + +static ssize_t +buffer_percent_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + struct trace_array *tr = filp->private_data; + unsigned long val; + int ret; + + ret = kstrtoul_from_user(ubuf, cnt, 10, &val); + if (ret) + return ret; + + if (val > 100) + return -EINVAL; + + if (!val) + val = 1; + + tr->buffer_percent = val; + + (*ppos)++; + + return cnt; +} + +static const struct file_operations buffer_percent_fops = { + .open = tracing_open_generic_tr, + .read = buffer_percent_read, + .write = buffer_percent_write, + .release = tracing_release_generic_tr, + .llseek = default_llseek, +}; + struct dentry *trace_instance_dir; static void @@ -7970,6 +8031,11 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) trace_create_file("timestamp_mode", 0444, d_tracer, tr, &trace_time_stamp_mode_fops); + tr->buffer_percent = 50; + + trace_create_file("buffer_percent", 0444, d_tracer, + tr, &buffer_percent_fops); + create_trace_options_dir(tr); #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |