| From | Jiri Slaby <> | Subject | [PATCH 3.12 025/103] tracepoint: Do not waste memory on mods with no tracepoints | Date | Thu, 29 May 2014 15:48:10 +0200 |
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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit 7dec935a3aa04412cba2cebe1524ae0d34a30c24 upstream.
No reason to allocate tp_module structures for modules that have no tracepoints. This just wastes memory.
Fixes: b75ef8b44b1c "Tracepoint: Dissociate from module mutex" Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- kernel/tracepoint.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 031cc5655a51..63630aef3bd3 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -641,6 +641,9 @@ static int tracepoint_module_coming(struct module *mod) struct tp_module *tp_mod, *iter; int ret = 0; + if (!mod->num_tracepoints) + return 0; + /* * We skip modules that taint the kernel, especially those with different * module headers (for forced load), to make sure we don't cause a crash. @@ -684,6 +687,9 @@ static int tracepoint_module_going(struct module *mod) { struct tp_module *pos; + if (!mod->num_tracepoints) + return 0; + mutex_lock(&tracepoints_mutex); tracepoint_update_probe_range(mod->tracepoints_ptrs, mod->tracepoints_ptrs + mod->num_tracepoints); -- 1.9.3
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