Merge branches 'tracing/fastboot', 'tracing/ftrace' and 'tracing/urgent' into tracing/core
This commit is contained in:
Ingo Molnar
commit
c91add5fa6
@ -82,7 +82,7 @@ of ftrace. Here is a list of some of the key files:
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tracer is not adding more data, they will display
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the same information every time they are read.
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iter_ctrl: This file lets the user control the amount of data
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trace_options: This file lets the user control the amount of data
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that is displayed in one of the above output
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files.
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@ -94,10 +94,10 @@ of ftrace. Here is a list of some of the key files:
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only be recorded if the latency is greater than
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the value in this file. (in microseconds)
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trace_entries: This sets or displays the number of bytes each CPU
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buffer_size_kb: This sets or displays the number of kilobytes each CPU
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buffer can hold. The tracer buffers are the same size
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for each CPU. The displayed number is the size of the
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CPU buffer and not total size of all buffers. The
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CPU buffer and not total size of all buffers. The
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trace buffers are allocated in pages (blocks of memory
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that the kernel uses for allocation, usually 4 KB in size).
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If the last page allocated has room for more bytes
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@ -316,23 +316,23 @@ The above is mostly meaningful for kernel developers.
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The rest is the same as the 'trace' file.
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iter_ctrl
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---------
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trace_options
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-------------
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The iter_ctrl file is used to control what gets printed in the trace
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The trace_options file is used to control what gets printed in the trace
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output. To see what is available, simply cat the file:
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cat /debug/tracing/iter_ctrl
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cat /debug/tracing/trace_options
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print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \
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noblock nostacktrace nosched-tree
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To disable one of the options, echo in the option prepended with "no".
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echo noprint-parent > /debug/tracing/iter_ctrl
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echo noprint-parent > /debug/tracing/trace_options
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To enable an option, leave off the "no".
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echo sym-offset > /debug/tracing/iter_ctrl
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echo sym-offset > /debug/tracing/trace_options
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Here are the available options:
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@ -1299,41 +1299,29 @@ trace entries
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-------------
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Having too much or not enough data can be troublesome in diagnosing
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an issue in the kernel. The file trace_entries is used to modify
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an issue in the kernel. The file buffer_size_kb is used to modify
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the size of the internal trace buffers. The number listed
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is the number of entries that can be recorded per CPU. To know
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the full size, multiply the number of possible CPUS with the
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number of entries.
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# cat /debug/tracing/trace_entries
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65620
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# cat /debug/tracing/buffer_size_kb
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1408 (units kilobytes)
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Note, to modify this, you must have tracing completely disabled. To do that,
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echo "nop" into the current_tracer. If the current_tracer is not set
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to "nop", an EINVAL error will be returned.
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# echo nop > /debug/tracing/current_tracer
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# echo 100000 > /debug/tracing/trace_entries
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# cat /debug/tracing/trace_entries
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100045
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Notice that we echoed in 100,000 but the size is 100,045. The entries
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are held in individual pages. It allocates the number of pages it takes
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to fulfill the request. If more entries may fit on the last page
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then they will be added.
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# echo 1 > /debug/tracing/trace_entries
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# cat /debug/tracing/trace_entries
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85
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This shows us that 85 entries can fit in a single page.
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# echo 10000 > /debug/tracing/buffer_size_kb
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# cat /debug/tracing/buffer_size_kb
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10000 (units kilobytes)
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The number of pages which will be allocated is limited to a percentage
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of available memory. Allocating too much will produce an error.
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# echo 1000000000000 > /debug/tracing/trace_entries
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# echo 1000000000000 > /debug/tracing/buffer_size_kb
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-bash: echo: write error: Cannot allocate memory
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# cat /debug/tracing/trace_entries
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# cat /debug/tracing/buffer_size_kb
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85
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@ -179,8 +179,7 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
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if (ftrace_enabled) {
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/* If we only have one func left, then call that directly */
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if (ftrace_list == &ftrace_list_end ||
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ftrace_list->next == &ftrace_list_end)
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if (ftrace_list->next == &ftrace_list_end)
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ftrace_trace_function = ftrace_list->func;
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}
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@ -533,6 +533,12 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
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LIST_HEAD(pages);
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int i, cpu;
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/*
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* Always succeed at resizing a non-existent buffer:
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*/
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if (!buffer)
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return size;
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size = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
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size *= BUF_PAGE_SIZE;
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buffer_size = buffer->pages * BUF_PAGE_SIZE;
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@ -204,8 +204,9 @@ static DEFINE_MUTEX(trace_types_lock);
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/* trace_wait is a waitqueue for tasks blocked on trace_poll */
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static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
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/* trace_flags holds iter_ctrl options */
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unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK;
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/* trace_flags holds trace_options default values */
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unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
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TRACE_ITER_ANNOTATE;
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/**
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* trace_wake_up - wake up tasks waiting for trace input
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@ -261,6 +262,7 @@ static const char *trace_options[] = {
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#ifdef CONFIG_BRANCH_TRACER
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"branch",
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#endif
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"annotate",
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NULL
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};
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@ -1113,6 +1115,7 @@ void tracing_stop_function_trace(void)
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enum trace_file_type {
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TRACE_FILE_LAT_FMT = 1,
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TRACE_FILE_ANNOTATE = 2,
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};
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static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
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@ -1532,6 +1535,12 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
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{
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struct trace_seq *s = &iter->seq;
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if (!(trace_flags & TRACE_ITER_ANNOTATE))
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return;
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if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
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return;
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if (cpu_isset(iter->cpu, iter->started))
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return;
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@ -2132,6 +2141,11 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
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iter->trace = current_trace;
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iter->pos = -1;
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/* Annotate start of buffers if we had overruns */
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if (ring_buffer_overruns(iter->tr->buffer))
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iter->iter_flags |= TRACE_FILE_ANNOTATE;
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for_each_tracing_cpu(cpu) {
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iter->buffer_iter[cpu] =
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@ -2411,7 +2425,7 @@ static struct file_operations tracing_cpumask_fops = {
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};
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static ssize_t
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tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
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tracing_trace_options_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char *buf;
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@ -2448,7 +2462,7 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
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}
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static ssize_t
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tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
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tracing_trace_options_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char buf[64];
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@ -2493,8 +2507,8 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
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static struct file_operations tracing_iter_fops = {
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.open = tracing_open_generic,
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.read = tracing_iter_ctrl_read,
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.write = tracing_iter_ctrl_write,
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.read = tracing_trace_options_read,
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.write = tracing_trace_options_write,
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};
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static const char readme_msg[] =
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@ -2508,9 +2522,9 @@ static const char readme_msg[] =
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"# echo sched_switch > /debug/tracing/current_tracer\n"
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"# cat /debug/tracing/current_tracer\n"
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"sched_switch\n"
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"# cat /debug/tracing/iter_ctrl\n"
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"# cat /debug/tracing/trace_options\n"
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"noprint-parent nosym-offset nosym-addr noverbose\n"
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"# echo print-parent > /debug/tracing/iter_ctrl\n"
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"# echo print-parent > /debug/tracing/trace_options\n"
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"# echo 1 > /debug/tracing/tracing_enabled\n"
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"# cat /debug/tracing/trace > /tmp/trace.txt\n"
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"echo 0 > /debug/tracing/tracing_enabled\n"
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@ -2905,7 +2919,7 @@ tracing_entries_read(struct file *filp, char __user *ubuf,
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char buf[64];
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int r;
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r = sprintf(buf, "%lu\n", tr->entries);
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r = sprintf(buf, "%lu\n", tr->entries >> 10);
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return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
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}
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@ -2945,6 +2959,9 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
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atomic_inc(&max_tr.data[cpu]->disabled);
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}
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/* value is in KB */
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val <<= 10;
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if (val != global_trace.entries) {
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ret = ring_buffer_resize(global_trace.buffer, val);
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if (ret < 0) {
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@ -3145,10 +3162,10 @@ static __init int tracer_init_debugfs(void)
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if (!entry)
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pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
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entry = debugfs_create_file("iter_ctrl", 0644, d_tracer,
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entry = debugfs_create_file("trace_options", 0644, d_tracer,
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NULL, &tracing_iter_fops);
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if (!entry)
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pr_warning("Could not create debugfs 'iter_ctrl' entry\n");
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pr_warning("Could not create debugfs 'trace_options' entry\n");
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entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
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NULL, &tracing_cpumask_fops);
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@ -3198,11 +3215,11 @@ static __init int tracer_init_debugfs(void)
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pr_warning("Could not create debugfs "
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"'trace_pipe' entry\n");
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entry = debugfs_create_file("trace_entries", 0644, d_tracer,
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entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
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&global_trace, &tracing_entries_fops);
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if (!entry)
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pr_warning("Could not create debugfs "
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"'trace_entries' entry\n");
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"'buffer_size_kb' entry\n");
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entry = debugfs_create_file("trace_marker", 0220, d_tracer,
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NULL, &tracing_mark_fops);
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@ -473,6 +473,7 @@ enum trace_iterator_flags {
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#ifdef CONFIG_BRANCH_TRACER
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TRACE_ITER_BRANCH = 0x1000,
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#endif
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TRACE_ITER_ANNOTATE = 0x2000,
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};
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/*
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