This is a note to let you know that I've just added the patch titled
tracing: Show size of requested perf buffer
to the 5.4-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:
tracing-show-size-of-requested-perf-buffer.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a90afe8d020da9298c98fddb19b7a6372e2feb45 Mon Sep 17 00:00:00 2001
From: "Robin H. Johnson" <robbat2@xxxxxxxxxx>
Date: Mon, 30 Aug 2021 21:37:22 -0700
Subject: tracing: Show size of requested perf buffer
From: Robin H. Johnson <robbat2@xxxxxxxxxx>
commit a90afe8d020da9298c98fddb19b7a6372e2feb45 upstream.
If the perf buffer isn't large enough, provide a hint about how large it
needs to be for whatever is running.
Link: https://lkml.kernel.org/r/20210831043723.13481-1-robbat2@xxxxxxxxxx
Signed-off-by: Robin H. Johnson <robbat2@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxx>
---
kernel/trace/trace_event_perf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -395,7 +395,8 @@ void *perf_trace_buf_alloc(int size, str
BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
- "perf buffer not large enough"))
+ "perf buffer not large enough, wanted %d, have %d",
+ size, PERF_MAX_TRACE_SIZE))
return NULL;
*rctxp = rctx = perf_swevent_get_recursion_context();
Patches currently in stable-queue which might be from robbat2@xxxxxxxxxx are
queue-5.4/tracing-increase-perf_max_trace_size-to-handle-sentinel1-and-docker-together.patch
queue-5.4/tracing-show-size-of-requested-perf-buffer.patch
