diff mbox series

[5.15,5.10,5.4,4.19,1/2] tracing: Show size of requested perf buffer

Message ID 20240424222010.2547286-2-cascardo@igalia.com (mailing list archive)
State New
Headers show
Series Fix warning when tracing with large filenames | expand

Commit Message

Thadeu Lima de Souza Cascardo April 24, 2024, 10:20 p.m. UTC 
From: "Robin H. Johnson" <robbat2@gentoo.org>

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@gentoo.org

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
---
 kernel/trace/trace_event_perf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 083f648e3265..61e3a2620fa3 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -401,7 +401,8 @@  void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp)
 	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();