Component Type: kbuild config

Description: Allow snapshot to swap per CPU

More info: Allow doing a snapshot of a single CPU buffer instead of a full swap (all buffers). If this is set, then the following is allowed: echo 1 > /sys/kernel/debug/tracing/per_cpu/cpu2/snapshot After which, only the tracing buffer for CPU 2 was swapped with the main tracing buffer, and the other CPU buffers remain the same. When this is enabled, this adds a little more overhead to the trace recording, as it needs to add some checks to synchronize recording with swaps. But this does not affect the performance of the overall system. This is enabled by default when the preempt or irq latency tracers are enabled, as those need to swap as well and already adds the overhead (plus a lot more).

Build project: Kconfig (Linux kconfig) (Path: kernel\trace\Kconfig )

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