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Date: Tue, 2 Dec 2008 09:23:37 +0100 From: Ingo Molnar <mingo@...e.hu> To: Liming Wang <liming.wang@...driver.com> Cc: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/1] function trace: fix a bug of single thread function trace * Liming Wang <liming.wang@...driver.com> wrote: > Impact: fix a bug in ftrace_update_pid_func > > When disabling single thread function trace using > "echo -1 > set_ftrace_pid", the normal function trace > has to restore to original function, otherwise the normal > function trace will not work well. > Without this commit, something like below: > > $ ps |grep 850 > 850 root 2556 S -/bin/sh > $ echo 850 > /debug/tracing/set_ftrace_pid > $ echo function > /debug/tracing/current_tracer > $ echo 1 > /debug/tracing/tracing_enabled > $ sleep 1 > $ echo 0 > /debug/tracing/tracing_enabled > $ cat /debug/tracing/trace_pipe |wc -l > 59704 > $ echo -1 > /debug/tracing/set_ftrace_pid > $ echo 1 > /debug/tracing/tracing_enabled > $ sleep 1 > $ echo 0 > /debug/tracing/tracing_enabled > $ more /debug/tracing/trace_pipe > <====== nothing output now! > it should output trace record. > > Signed-off-by: Liming Wang <liming.wang@...driver.com> > --- > kernel/trace/ftrace.c | 6 ++---- > 1 files changed, 2 insertions(+), 4 deletions(-) applied to tip/tracing/ftrace, thanks! Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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