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ftrace: show buffer size in kilobytes

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Impact: change the units of buffer_size_kb to kilobytes

This patch changes the units of the buffer_size_kb file to kilobytes.
Reading and writing to the file uses kilobytes as units. To help
users to know what units are used, the output of the file now
looks like:

  # cat /debug/tracing/buffer_size_kb
  1408

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-11-13 00:09:35 -05:00
committed by Ingo Molnar
parent a94c80e78b
commit 1696b2b0f4
2 changed files with 9 additions and 18 deletions
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5
kernel/trace/trace.c
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@@ -2905,7 +2905,7 @@ tracing_entries_read(struct file *filp, char __user *ubuf,
char buf[64];
int r;
r = sprintf(buf, "%lu\n", tr->entries);
r = sprintf(buf, "%lu\n", tr->entries >> 10);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
@@ -2945,6 +2945,9 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
atomic_inc(&max_tr.data[cpu]->disabled);
}
/* value is in KB */
val <<= 10;
if (val != global_trace.entries) {
ret = ring_buffer_resize(global_trace.buffer, val);
if (ret < 0) {