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| author | Vincent Donnefort <[email protected]> | 2024-02-20 20:23:07 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2024-03-18 10:12:47 -0400 |
| commit | 180e4e390978af9d0cc060e87920c462276453b9 (patch) | |
| tree | ef13bfaaa3fd1823bc8fc0969866e951c0975e33 /tools/perf/util/trace-event-scripting.c | |
| parent | b70f2938242a028f8e9473781ede175486a59dc8 (diff) | |
tracing: Add snapshot refcount
When a ring-buffer is memory mapped by user-space, no trace or
ring-buffer swap is possible. This means the snapshot feature is
mutually exclusive with the memory mapping. Having a refcount on
snapshot users will help to know if a mapping is possible or not.
Instead of relying on the global trace_types_lock, a new spinlock is
introduced to serialize accesses to trace_array->snapshot. This intends
to allow access to that variable in a context where the mmap lock is
already held.
Link: https://lore.kernel.org/linux-trace-kernel/[email protected]
Signed-off-by: Vincent Donnefort <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'tools/perf/util/trace-event-scripting.c')
0 files changed, 0 insertions, 0 deletions