sampler

Enumerations

enum class SamplingState : uint8_t
Name Value Comments
Unallocated 0

The idle state for the sampler. We're not actively sampling nor is there a user handle
associated with us.
Configured 1

We have buffers allocated and the user has a handle to us and can start a session.
Running 2

The session is in progress. We are taking samples and writing data.
Stopping 3

The session is stopping, no more references to the buffers are allowed to be created and we're
waiting for existing references to be released.
Reading 4

We have a read in flight. If we get a destruction request, we need to delay destruction of
resources until the read is completed.
Destroying 5

We requested a session teardown while were we reading. Once the read finishes, we'll clear the
buffers and become allocated.

The current state of the sampler.

Valid state transitions are:

```

/- [ Destroying ]

<

- [ Reading ]

| ^ |

v | v

[ Unallocated ] -> [ Configured ] -> [ Running ]

^ | ^ |

\

----------/ | v

\

-[ Stopping ]

```

Defined at line 47 of file ../../zircon/kernel/lib/thread_sampler/include/lib/thread_sampler/thread_sampler.h

Records

Functions

  • void sampler_percpu_init ()

    Joins the sampling session on the current cpu if one exists.

    Defined at line 27 of file ../../zircon/kernel/lib/thread_sampler/thread_sampler.cc

  • void sampler_percpu_shutdown ()

    Exit the sampling session on the current cpu if one exists.

    Defined at line 28 of file ../../zircon/kernel/lib/thread_sampler/thread_sampler.cc

Variables

ThreadSampler gThreadSampler

Defined at line 25 of file ../../zircon/kernel/lib/thread_sampler/thread_sampler.cc