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author | Michael Sartain <mikesart@fastmail.com> | 2017-07-05 22:07:15 -0600 |
---|---|---|
committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-07-06 10:11:53 -0400 |
commit | 99c621d704cf1c4eb74c3c42e674edf3df64f92d (patch) | |
tree | 451419a4c1f2ea68d8b40dbcd17778406dce4281 /kernel/trace | |
parent | 69d71879d2cf67a381055f698a1d7def00dc4ed7 (diff) | |
download | op-kernel-dev-99c621d704cf1c4eb74c3c42e674edf3df64f92d.zip op-kernel-dev-99c621d704cf1c4eb74c3c42e674edf3df64f92d.tar.gz |
tracing: Add saved_tgids file to show cached pid to tgid mappings
Export the cached pid / tgid mappings in debugfs tracing saved_tgids file.
This allows user apps to translate the pids from a trace to their respective
thread group.
Example saved_tgids file with pid / tgid values separated by ' ':
# cat saved_tgids
1048 1048
1047 1047
7 7
1049 1047
1054 1047
1053 1047
Link: http://lkml.kernel.org/r/20170630004023.064965233@goodmis.org
Link: http://lkml.kernel.org/r/20170706040713.unwkumbta5menygi@mikesart-cos
Reviewed-by: Joel Fernandes <joelaf@google.com>
Signed-off-by: Michael Sartain <mikesart@fastmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r-- | kernel/trace/trace.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 00e2e41..f079a8c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4688,6 +4688,76 @@ static const struct file_operations tracing_readme_fops = { .llseek = generic_file_llseek, }; +static void *saved_tgids_next(struct seq_file *m, void *v, loff_t *pos) +{ + int *ptr = v; + + if (*pos || m->count) + ptr++; + + (*pos)++; + + for (; ptr <= &tgid_map[PID_MAX_DEFAULT]; ptr++) { + if (trace_find_tgid(*ptr)) + return ptr; + } + + return NULL; +} + +static void *saved_tgids_start(struct seq_file *m, loff_t *pos) +{ + void *v; + loff_t l = 0; + + if (!tgid_map) + return NULL; + + v = &tgid_map[0]; + while (l <= *pos) { + v = saved_tgids_next(m, v, &l); + if (!v) + return NULL; + } + + return v; +} + +static void saved_tgids_stop(struct seq_file *m, void *v) +{ +} + +static int saved_tgids_show(struct seq_file *m, void *v) +{ + int pid = (int *)v - tgid_map; + + seq_printf(m, "%d %d\n", pid, trace_find_tgid(pid)); + return 0; +} + +static const struct seq_operations tracing_saved_tgids_seq_ops = { + .start = saved_tgids_start, + .stop = saved_tgids_stop, + .next = saved_tgids_next, + .show = saved_tgids_show, +}; + +static int tracing_saved_tgids_open(struct inode *inode, struct file *filp) +{ + if (tracing_disabled) + return -ENODEV; + + return seq_open(filp, &tracing_saved_tgids_seq_ops); +} + + +static const struct file_operations tracing_saved_tgids_fops = { + .open = tracing_saved_tgids_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos) { unsigned int *ptr = v; @@ -7920,6 +7990,9 @@ static __init int tracer_init_tracefs(void) trace_create_file("saved_cmdlines_size", 0644, d_tracer, NULL, &tracing_saved_cmdlines_size_fops); + trace_create_file("saved_tgids", 0444, d_tracer, + NULL, &tracing_saved_tgids_fops); + trace_eval_init(); trace_create_eval_file(d_tracer); |