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| author | Andrea Righi <andrea.righi@canonical.com> | 2020-11-28 10:15:17 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-30 21:22:05 +0100 |
| commit | 8785f51a17083eee7c37606079c6447afc6ba102 (patch) | |
| tree | 27ebc928988e9b52f7311697260affe50052ea93 /samples/ftrace | |
| parent | ring-buffer: Update write stamp with the correct ts (diff) | |
| download | linux-8785f51a17083eee7c37606079c6447afc6ba102.tar.xz linux-8785f51a17083eee7c37606079c6447afc6ba102.zip | |
ring-buffer: Set the right timestamp in the slow path of __rb_reserve_next()
In the slow path of __rb_reserve_next() a nested event(s) can happen
between evaluating the timestamp delta of the current event and updating
write_stamp via local_cmpxchg(); in this case the delta is not valid
anymore and it should be set to 0 (same timestamp as the interrupting
event), since the event that we are currently processing is not the last
event in the buffer.
Link: https://lkml.kernel.org/r/X8IVJcp1gRE+FJCJ@xps-13-7390
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lwn.net/Articles/831207
Fixes: a389d86f7fd0 ("ring-buffer: Have nested events still record running time stamp")
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'samples/ftrace')
0 files changed, 0 insertions, 0 deletions