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Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (121 commits)
  perf symbols: Increase symbol KSYM_NAME_LEN size
  perf hists browser: Refuse 'a' hotkey on non symbolic views
  perf ui browser: Use libslang to read keys
  perf tools: Fix tracing info recording
  perf hists browser: Elide DSO column when it is set to just one DSO, ditto for threads
  perf hists: Don't consider filtered entries when calculating column widths
  perf hists: Don't decay total_period for filtered entries
  perf hists browser: Honour symbol_conf.show_{nr_samples,total_period}
  perf hists browser: Do not exit on tab key with single event
  perf annotate browser: Don't change selection line when returning from callq
  perf tools: handle endianness of feature bitmap
  perf tools: Add prelink suggestion to dso update message
  perf script: Fix unknown feature comment
  perf hists browser: Apply the dso and thread filters when merging new batches
  perf hists: Move the dso and thread filters from hist_browser
  perf ui browser: Honour the xterm colors
  perf top tui: Give color hints just on the percentage, like on --stdio
  perf ui browser: Make the colors configurable and change the defaults
  perf tui: Remove unneeded call to newtCls on startup
  perf hists: Don't format the percentage on hist_entry__snprintf
  ...

Fix up conflicts in arch/x86/kernel/kprobes.c manually.

Ingo's tree did the insane "add volatile to const array", which just
doesn't make sense ("volatile const"?).  But we could remove the const
*and* make the array volatile to make doubly sure that gcc doesn't
optimize it away..

Also fix up kernel/trace/ring_buffer.c non-data-conflicts manually: the
reader_lock has been turned into a raw lock by the core locking merge,
and there was a new user of it introduced in this perf core merge.  Make
sure that new use also uses the raw accessor functions.
This commit is contained in:
Linus Torvalds
2011-10-26 17:03:38 +02:00
parent 1f6e05171b c752d04066
commit 7115e3fcf4
117 changed files with 6213 additions and 2884 deletions
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183
kernel/trace/trace.c
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@@ -435,6 +435,7 @@ static struct {
} trace_clocks[] = {
{ trace_clock_local, "local" },
{ trace_clock_global, "global" },
{ trace_clock_counter, "counter" },
};
int trace_clock_id;
@@ -2159,6 +2160,14 @@ void trace_default_header(struct seq_file *m)
}
}
static void test_ftrace_alive(struct seq_file *m)
{
if (!ftrace_is_dead())
return;
seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n");
seq_printf(m, "# MAY BE MISSING FUNCTION EVENTS\n");
}
static int s_show(struct seq_file *m, void *v)
{
struct trace_iterator *iter = v;
@@ -2168,6 +2177,7 @@ static int s_show(struct seq_file *m, void *v)
if (iter->tr) {
seq_printf(m, "# tracer: %s\n", iter->trace->name);
seq_puts(m, "#\n");
test_ftrace_alive(m);
}
if (iter->trace && iter->trace->print_header)
iter->trace->print_header(m);
@@ -2710,9 +2720,9 @@ static const char readme_msg[] =
"# cat /sys/kernel/debug/tracing/trace_options\n"
"noprint-parent nosym-offset nosym-addr noverbose\n"
"# echo print-parent > /sys/kernel/debug/tracing/trace_options\n"
"# echo 1 > /sys/kernel/debug/tracing/tracing_enabled\n"
"# echo 1 > /sys/kernel/debug/tracing/tracing_on\n"
"# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n"
"# echo 0 > /sys/kernel/debug/tracing/tracing_enabled\n"
"# echo 0 > /sys/kernel/debug/tracing/tracing_on\n"
;
static ssize_t
@@ -3568,6 +3578,30 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
return cnt;
}
static ssize_t
tracing_total_entries_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, cpu;
unsigned long size = 0, expanded_size = 0;
mutex_lock(&trace_types_lock);
for_each_tracing_cpu(cpu) {
size += tr->entries >> 10;
if (!ring_buffer_expanded)
expanded_size += trace_buf_size >> 10;
}
if (ring_buffer_expanded)
r = sprintf(buf, "%lu\n", size);
else
r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size);
mutex_unlock(&trace_types_lock);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
static ssize_t
tracing_free_buffer_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -3594,22 +3628,24 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
return 0;
}
static int mark_printk(const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = trace_vprintk(0, fmt, args);
va_end(args);
return ret;
}
static ssize_t
tracing_mark_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
char *buf;
size_t written;
unsigned long addr = (unsigned long)ubuf;
struct ring_buffer_event *event;
struct ring_buffer *buffer;
struct print_entry *entry;
unsigned long irq_flags;
struct page *pages[2];
int nr_pages = 1;
ssize_t written;
void *page1;
void *page2;
int offset;
int size;
int len;
int ret;
if (tracing_disabled)
return -EINVAL;
@@ -3617,28 +3653,81 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
if (cnt > TRACE_BUF_SIZE)
cnt = TRACE_BUF_SIZE;
buf = kmalloc(cnt + 2, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
/*
* Userspace is injecting traces into the kernel trace buffer.
* We want to be as non intrusive as possible.
* To do so, we do not want to allocate any special buffers
* or take any locks, but instead write the userspace data
* straight into the ring buffer.
*
* First we need to pin the userspace buffer into memory,
* which, most likely it is, because it just referenced it.
* But there's no guarantee that it is. By using get_user_pages_fast()
* and kmap_atomic/kunmap_atomic() we can get access to the
* pages directly. We then write the data directly into the
* ring buffer.
*/
BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE);
if (copy_from_user(buf, ubuf, cnt)) {
kfree(buf);
return -EFAULT;
/* check if we cross pages */
if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK))
nr_pages = 2;
offset = addr & (PAGE_SIZE - 1);
addr &= PAGE_MASK;
ret = get_user_pages_fast(addr, nr_pages, 0, pages);
if (ret < nr_pages) {
while (--ret >= 0)
put_page(pages[ret]);
written = -EFAULT;
goto out;
}
if (buf[cnt-1] != '\n') {
buf[cnt] = '\n';
buf[cnt+1] = '\0';
} else
buf[cnt] = '\0';
written = mark_printk("%s", buf);
kfree(buf);
page1 = kmap_atomic(pages[0]);
if (nr_pages == 2)
page2 = kmap_atomic(pages[1]);
local_save_flags(irq_flags);
size = sizeof(*entry) + cnt + 2; /* possible \n added */
buffer = global_trace.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
irq_flags, preempt_count());
if (!event) {
/* Ring buffer disabled, return as if not open for write */
written = -EBADF;
goto out_unlock;
}
entry = ring_buffer_event_data(event);
entry->ip = _THIS_IP_;
if (nr_pages == 2) {
len = PAGE_SIZE - offset;
memcpy(&entry->buf, page1 + offset, len);
memcpy(&entry->buf[len], page2, cnt - len);
} else
memcpy(&entry->buf, page1 + offset, cnt);
if (entry->buf[cnt - 1] != '\n') {
entry->buf[cnt] = '\n';
entry->buf[cnt + 1] = '\0';
} else
entry->buf[cnt] = '\0';
ring_buffer_unlock_commit(buffer, event);
written = cnt;
*fpos += written;
/* don't tell userspace we wrote more - it might confuse them */
if (written > cnt)
written = cnt;
out_unlock:
if (nr_pages == 2)
kunmap_atomic(page2);
kunmap_atomic(page1);
while (nr_pages > 0)
put_page(pages[--nr_pages]);
out:
return written;
}
@@ -3739,6 +3828,12 @@ static const struct file_operations tracing_entries_fops = {
.llseek = generic_file_llseek,
};
static const struct file_operations tracing_total_entries_fops = {
.open = tracing_open_generic,
.read = tracing_total_entries_read,
.llseek = generic_file_llseek,
};
static const struct file_operations tracing_free_buffer_fops = {
.write = tracing_free_buffer_write,
.release = tracing_free_buffer_release,
@@ -3808,8 +3903,6 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
if (info->read < PAGE_SIZE)
goto read;
info->read = 0;
trace_access_lock(info->cpu);
ret = ring_buffer_read_page(info->tr->buffer,
&info->spare,
@@ -3819,6 +3912,8 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
if (ret < 0)
return 0;
info->read = 0;
read:
size = PAGE_SIZE - info->read;
if (size > count)
@@ -4026,6 +4121,8 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
struct trace_array *tr = &global_trace;
struct trace_seq *s;
unsigned long cnt;
unsigned long long t;
unsigned long usec_rem;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s)
@@ -4042,6 +4139,17 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
trace_seq_printf(s, "commit overrun: %ld\n", cnt);
cnt = ring_buffer_bytes_cpu(tr->buffer, cpu);
trace_seq_printf(s, "bytes: %ld\n", cnt);
t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", t, usec_rem);
t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu));
usec_rem = do_div(t, USEC_PER_SEC);
trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
kfree(s);
@@ -4450,6 +4558,9 @@ static __init int tracer_init_debugfs(void)
trace_create_file("buffer_size_kb", 0644, d_tracer,
&global_trace, &tracing_entries_fops);
trace_create_file("buffer_total_size_kb", 0444, d_tracer,
&global_trace, &tracing_total_entries_fops);
trace_create_file("free_buffer", 0644, d_tracer,
&global_trace, &tracing_free_buffer_fops);
@@ -4566,6 +4677,12 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
tracing_off();
/* Did function tracer already get disabled? */
if (ftrace_is_dead()) {
printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
printk("# MAY BE MISSING FUNCTION EVENTS\n");
}
if (disable_tracing)
ftrace_kill();