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tracing: Show size of requested perf buffer
author
Robin H. Johnson
<robbat2@gentoo.org>
Tue, 31 Aug 2021 04:37:22 +0000
(21:37 -0700)
committer
Steven Rostedt (VMware)
<rostedt@goodmis.org>
Wed, 27 Oct 2021 16:25:09 +0000
(12:25 -0400)
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>
kernel/trace/trace_event_perf.c
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diff --git
a/kernel/trace/trace_event_perf.c
b/kernel/trace/trace_event_perf.c
index
fba8cb7
..
a114549
100644
(file)
--- a/
kernel/trace/trace_event_perf.c
+++ b/
kernel/trace/trace_event_perf.c
@@
-400,7
+400,8
@@
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();