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| author | Vincent Donnefort <vdonnefort@google.com> | 2024-02-20 21:23:07 +0100 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-03-18 15:12:47 +0100 |
| commit | 180e4e390978af9d0cc060e87920c462276453b9 (patch) | |
| tree | ef13bfaaa3fd1823bc8fc0969866e951c0975e33 /MAINTAINERS | |
| parent | ring-buffer: Make wake once of ring_buffer_wait() more robust (diff) | |
| download | linux-180e4e390978af9d0cc060e87920c462276453b9.tar.xz linux-180e4e390978af9d0cc060e87920c462276453b9.zip | |
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/20240220202310.2489614-4-vdonnefort@google.com
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'MAINTAINERS')
0 files changed, 0 insertions, 0 deletions