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authorLiming Wang <liming.wang@windriver.com>2008-12-02 10:33:08 +0800
committerIngo Molnar <mingo@elte.hu>2008-12-02 09:23:24 +0100
commit66eafebc1086014709dc38f52ddcb3d67d9b346c (patch)
tree10147e635d8d4d15d73cb23baa32a2357570eab0 /drivers/net/mlx4/en_main.c
parent222658e08f72cd539d01f3aabdc258c596f487e2 (diff)
function trace: fix a bug of single thread function trace
Impact: fix "no output from tracer" bug caused by 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@windriver.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/net/mlx4/en_main.c')
0 files changed, 0 insertions, 0 deletions