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author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2009-07-28 12:17:22 (GMT) |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-07-28 21:17:23 (GMT) |
commit | 74e7ff8c50b6b022e6ffaa736b16a4dc161d3eaf (patch) | |
tree | 5bbe7b9f239f1e7b0a688b521f5dca8b9ea99ef4 /drivers/mmc/host | |
parent | 38ceb592fcac9110c6b3c87ea0a27bff68c43486 (diff) | |
download | linux-fsl-qoriq-74e7ff8c50b6b022e6ffaa736b16a4dc161d3eaf.tar.xz |
tracing: Fix missing function_graph events when we splice_read from trace_pipe
About a half events are missing when we splice_read
from trace_pipe. They are unexpectedly consumed because we ignore
the TRACE_TYPE_NO_CONSUME return value used by the function graph
tracer when it needs to consume the events by itself to walk on
the ring buffer.
The same problem appears with ftrace_dump()
Example of an output before this patch:
1) | ktime_get_real() {
1) 2.846 us | read_hpet();
1) 4.558 us | }
1) 6.195 us | }
After this patch:
0) | ktime_get_real() {
0) | getnstimeofday() {
0) 1.960 us | read_hpet();
0) 3.597 us | }
0) 5.196 us | }
The fix also applies on 2.6.30
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: stable@kernel.org
LKML-Reference: <4A6EEC52.90704@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'drivers/mmc/host')
0 files changed, 0 insertions, 0 deletions