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At the same time, turning them up is a serious burden on > the host due to the console locking overhead. > > Add a new Kconfig option that redirects dfprintk() output to the trace > buffer. This is more efficient than logging to the console and allows > for proper interleaving of dprintk and static tracepoint events. > > Since using trace_printk() causes scary warnings to pop at boot time, > this new option defaults to "n". > > Signed-off-by: Jeff Layton > --- > include/linux/sunrpc/debug.h | 10 ++++++++-- > net/sunrpc/Kconfig | 14 ++++++++++++++ > 2 files changed, 22 insertions(+), 2 deletions(-) > > diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h > index 99a6fa4a1d6af0b275546a53957f07c9a509f2ac..891f6173c951a6644018237017c845d81b42aa76 100644 > --- a/include/linux/sunrpc/debug.h > +++ b/include/linux/sunrpc/debug.h > @@ -30,17 +30,23 @@ extern unsigned int nlm_debug; > #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) > # define ifdebug(fac) if (unlikely(rpc_debug & RPCDBG_##fac)) > > +# if IS_ENABLED(CONFIG_SUNRPC_DEBUG_TRACE) > +# define __sunrpc_printk(fmt, ...) trace_printk(fmt, ##__VA_ARGS__) > +# else > +# define __sunrpc_printk(fmt, ...) printk(KERN_DEFAULT fmt, ##__VA_ARGS__) > +# endif > + > # define dfprintk(fac, fmt, ...) \ > do { \ > ifdebug(fac) \ > - printk(KERN_DEFAULT fmt, ##__VA_ARGS__); \ > + __sunrpc_printk(fmt, ##__VA_ARGS__); \ > } while (0) > > # define dfprintk_rcu(fac, fmt, ...) \ > do { \ > ifdebug(fac) { \ > rcu_read_lock(); \ > - printk(KERN_DEFAULT fmt, ##__VA_ARGS__); \ > + __sunrpc_printk(fmt, ##__VA_ARGS__); \ > rcu_read_unlock(); \ > } \ > } while (0) > diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig > index 2d8b67dac7b5b58a8a86c3022dd573746fb22547..a570e7adf270fb8976f751266bbffe39ef696c6a 100644 > --- a/net/sunrpc/Kconfig > +++ b/net/sunrpc/Kconfig > @@ -101,6 +101,20 @@ config SUNRPC_DEBUG > > If unsure, say Y. > > +config SUNRPC_DEBUG_TRACE > + bool "RPC: Send dfprintk() output to the trace buffer" > + depends on SUNRPC_DEBUG && TRACING > + default n > + help > + dprintk() output can be voluminous, which can overwhelm the > + kernel's logging facility as it must be sent to the console. > + This option causes dprintk() output to go to the trace buffer > + instead of the kernel log. > + > + This will cause warnings about trace_printk() being used to be > + logged at boot time, so say N unless you are debugging a problem > + with sunrpc-based clients or services. > + > config SUNRPC_XPRT_RDMA > tristate "RPC-over-RDMA transport" > depends on SUNRPC && INFINIBAND && INFINIBAND_ADDR_TRANS > Nice and surgical. But I'm on the fence about whether this is a good long-term strategy. No real objections, though. Reviewed-by: Chuck Lever -- Chuck Lever