87c576584d73f8ba208602735e43913409204ab8
- when profiling is compiled in kernel includes a 64M buffer for sample - 64M is the default used by profile tool as its buffer - when using nmi profiling it is not possible to always copy sample stright to userland as the nmi may (and does) happen in bad moments - reduces sampling overhead as samples are copied out only when profiling stops
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