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Commit 78b92d50 authored by Robin H. Johnson's avatar Robin H. Johnson Committed by Greg Kroah-Hartman
Browse files

tracing: Show size of requested perf buffer 

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: default avatarRobin H. Johnson <robbat2@gentoo.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@igalia.com>
parent 69dc8fc8

kernel/trace/trace_event_perf.c

+2 −1
Original line number Diff line number Diff line
@@ -394,7 +394,8 @@ 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();