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tracing: Show size of requested perf buffer 

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>
This commit is contained in:
Robin H. Johnson 2021-08-30 21:37:22 -07:00 committed by Steven Rostedt (VMware)
parent 39d9c1c103
commit a90afe8d02
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_event_perf.c
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@ -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();