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tracing: Create seq_buf layer in trace_seq

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Create a seq_buf layer that trace_seq sits on. The seq_buf will not
be limited to page size. This will allow other usages of seq_buf
instead of a hard set PAGE_SIZE one that trace_seq has.

Link: http://lkml.kernel.org/r/20141104160221.864997179@goodmis.org
Link: http://lkml.kernel.org/r/20141114011412.170377300@goodmis.org

Tested-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-06-25 15:54:42 -04:00
committed by Steven Rostedt
parent 16a8ef2751
commit 3a161d99c4
8 changed files with 536 additions and 124 deletions
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6
kernel/trace/trace_events.c
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@@ -1044,7 +1044,7 @@ event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
mutex_unlock(&event_mutex);
if (file)
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->seq.len);
kfree(s);
@@ -1210,7 +1210,7 @@ subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
trace_seq_init(s);
print_subsystem_event_filter(system, s);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->seq.len);
kfree(s);
@@ -1265,7 +1265,7 @@ show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
trace_seq_init(s);
func(s);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->seq.len);
kfree(s);