This is a note to let you know that I've just added the patch titled
tracepoint: Do not waste memory on mods with no tracepoints
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracepoint-do-not-waste-memory-on-mods-with-no-tracepoints.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7dec935a3aa04412cba2cebe1524ae0d34a30c24 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Wed, 26 Feb 2014 10:54:36 -0500
Subject: tracepoint: Do not waste memory on mods with no tracepoints
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/tracepoint.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -638,6 +638,9 @@ static int tracepoint_module_coming(stru
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.
@@ -681,6 +684,9 @@ static int tracepoint_module_going(struc
{
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);
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-3.4/tracepoint-do-not-waste-memory-on-mods-with-no-tracepoints.patch
queue-3.4/blktrace-fix-accounting-of-partially-completed-requests.patch
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