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tracing/core: make the per cpu trace files in per cpu directories 

Impact: restructure the VFS layout of per CPU trace buffers

The per cpu trace files are all in a single directory:
/debug/tracing/per_cpu. In case of a large number of cpu, the
content of this directory becomes messy so we create now one
directory per cpu inside /debug/tracing/per_cpu which contain
each their own trace_pipe and trace files.

Ie:

 /debug/tracing$ ls -R per_cpu
 per_cpu:
 cpu0  cpu1

 per_cpu/cpu0:
 trace  trace_pipe

 per_cpu/cpu1:
 trace  trace_pipe

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2009-02-26 00:41:38 +01:00 committed by Ingo Molnar
parent f4abfb8d0d
commit 8656e7a2fa
1 changed files with 14 additions and 11 deletions
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25
kernel/trace/trace.c
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@ -3061,28 +3061,31 @@ struct dentry *tracing_dentry_percpu(void)
static void tracing_init_debugfs_percpu(long cpu)
{
struct dentry *d_percpu = tracing_dentry_percpu();
struct dentry *entry;
/* strlen(trace_pipe) + MAX(log10(cpu)) + '\0' */
char filename[17];
struct dentry *entry, *d_cpu;
/* strlen(cpu) + MAX(log10(cpu)) + '\0' */
char cpu_dir[7];
if (cpu > 999 || cpu < 0)
return;
/* per cpu trace_pipe */
sprintf(filename, "trace_pipe%ld", cpu);
sprintf(cpu_dir, "cpu%ld", cpu);
d_cpu = debugfs_create_dir(cpu_dir, d_percpu);
if (!d_cpu) {
pr_warning("Could not create debugfs '%s' entry\n", cpu_dir);
return;
}
entry = debugfs_create_file(filename, 0444, d_percpu,
/* per cpu trace_pipe */
entry = debugfs_create_file("trace_pipe", 0444, d_cpu,
(void *) cpu, &tracing_pipe_fops);
if (!entry)
pr_warning("Could not create debugfs '%s' entry\n", filename);
pr_warning("Could not create debugfs 'trace_pipe' entry\n");
/* per cpu trace */
sprintf(filename, "trace%ld", cpu);
entry = debugfs_create_file(filename, 0444, d_percpu,
entry = debugfs_create_file("trace", 0444, d_cpu,
(void *) cpu, &tracing_fops);
if (!entry)
pr_warning("Could not create debugfs '%s' entry\n", filename);
pr_warning("Could not create debugfs 'trace' entry\n");
}
#ifdef CONFIG_FTRACE_SELFTEST