Messages in this thread Patch in this message | | | From | Jianlin Lv <> | Subject | [PATCH] tracepoint: Allow livepatch module add trace event | Date | Wed, 2 Nov 2022 16:02:36 +0000 |
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In the case of keeping the system running, the preferred method for tracing the kernel is dynamic tracing (kprobe), but the drawback of this method is that events are lost, especially when tracing packages in the network stack.
Livepatching provides a potential solution, which is to reimplement the function you want to replace and insert a static tracepoint. In such a way, custom stable static tracepoints can be expanded without rebooting the system.
Signed-off-by: Jianlin Lv <iecedge@gmail.com> --- kernel/tracepoint.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index f23144af5743..8d1507dd0724 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -571,8 +571,8 @@ static void for_each_tracepoint_range( bool trace_module_has_bad_taint(struct module *mod) { return mod->taints & ~((1 << TAINT_OOT_MODULE) | (1 << TAINT_CRAP) | - (1 << TAINT_UNSIGNED_MODULE) | - (1 << TAINT_TEST)); + (1 << TAINT_UNSIGNED_MODULE) | (1 << TAINT_TEST) | + (1 << TAINT_LIVEPATCH)); } static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list); -- 2.25.1
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